For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 1
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
HMC920LP5E
ACTIVE BIAS CONTROLLER
Functional Diagram
Features
• Single Positive Voltage Supply (5V to 16.5V)
• Adjustable Drain Voltage 3V to 15V
• Adjustable Drain Current up to 500mA
• Internal Negative Voltage Generator
• Active Bias Current Regulation
• Stable Bias Current Over Temperature and
Process Variation and Aging
• Short Circuit Protection (Power Foldback)
• Adjustable Over/Under-Current Alarm
• Adjustable Low Vdd Voltage Alarm
• Automated Power-up Sequencing
• Enable Input for Active Bias Control
• Trigger-out Output for Daisy Chain Power-Up
and Power-Down Sequencing
Typical Applications
• Cellular Base Station
• Wireless Infrastructure Equipment
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 2
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
HMC920LP5E is an active bias controller which generates a regulated Drain voltage and actively adjusts the gate
voltage of an external amplier to achieve constant bias current. It can be used to bias any enhancement and depletion
type ampliers operating in Class-A regime with Drain voltages (VDRAIN) from 3V to 15V and drain currents (IDRAIN)
up to 500mA, offering a complete biasing solution.
HMC920LP5E achieves excellent bias stability over supply, temperature and process variations, and eliminates the
required calibration procedures used to prevent RF performance degradation due to such variations.
The HMC920LP5E is housed in an RoHS compliant 5x5 mm QFN leadless package with an exposed backside pad
to improve thermal characteristics.
General Description
Electrical Specications, TA = +25°C, Vdd = Vdd1 = Vdd2 = 15V
Parameter Symbol Conditions Min. Ty p . Max. Units
Supply Voltage Vdd 5 16.5 V
Quiescent Current IDD
Vdd = 5V EN = Vdig 35 mA
EN = GND 20 mA
Vdd = 15V EN = Vdig 35 mA
EN = GND 20 mA
Negative Voltage Output VNEG -2.5 V
Oscillator Frequency FOSC 250 kHz
Bandgap Reference VBGC 2 V
VDIG Feedback VDIGFB 2.5 V
LDOCC Feedback LDOFB 2 V
Enable Input Threshold ENTHRS Vinlow 1 V
Vinhigh 1. 4 V
ALMTRIG Input Threshold ALMTRIG Vinlow 1 V
Vinhigh 1. 4 V
Low Vdd Alarm Threshold VddCHK 3.8 V
VDRAIN Characteristics
DRAIN Current Adjustment Range IDRAIN 0500 mA
DRAIN Current Change Over Supply Voltage ΔIDRAINV VDRAIN set to 6V,
IDRAIN set to 100mA,
0.05 %/V
DRAIN Current Change Over Temperature 0.03 %/C
DRAIN Adjustment Range VDRAIN 315 V
VDRAIN Change Over Supply Voltage ΔVDRAIN VDRAIN set to 6V,
IDRAIN set to 100mA,
0.05 %/V
VDRAIN Change Over Temperature 0.008 %/C
VNEG Characteristics
Negative Voltage Output VNEG -2.5 V
VNEG Current Sink INEG 060 mA
VGATE Characteristics
GATE Current Supply IG -4 4mA
VGATE Low Level VG_MIN VNEG V
VGATE High Level VG_MAX VNEG+4.5 V
VDIG Characteristics
Adjustment Range VDIG 3.5 5 V
VDIG Current Source IDIG 30 mA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 3
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
VDRAIN Line Regulation Over IDRAIN
VDRAIN Line Regulation Over Temperature
IDRAIN Regulation Accuracy vs. Vdd [1][2]
100
102
104
106
108
110
7 8 9 10 11 12 13 14 15
+25C
+85C
-40C
SUPPLY VOLTAGE (V)
CURRENT (mA)
5.7
5.8
5.9
6
6.1
6.2
6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 15.5 16.5
Idrain=0mA
Idrain=100mA
Idrain=200mA
SUPPLY VOLTAGE (V)
DRAIN VOLTAGE VDRAIN (V)
5.9
5.94
5.98
6.02
6.06
6.1
6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 15.5 16.5
+25C
+85C
-40C
SUPPLY VOLTAGE (V)
DRAIN VOLTAGE VDRAIN (V)
No load condition
[1] IDRAIN is set to 110mA [2] HMC594LC3B is used as external amplier
VNEG Line Regulation Over Temperature
VDIG Line Regulation Over Temperature
3.4
3.42
3.44
3.46
3.48
3.5
5 6 7 8 9 10 11 12 13 14 15 16
+25C
+85C
-40C
SUPPLY VOLTAGE (V)
DIGITAL VOLTAGE VDIG (V)
No load condition
-2.5
-2.48
-2.46
-2.44
-2.42
-2.4
5 6 7 8 9 10 11 12 13 14 15 16
+25C
+85C
-40C
SUPPLY VOLTAGE (V)
NEGATIVE VOLTAGE VNEG (V)
No load condition
VDRAIN Load Regulation Over Vdd
5.7
5.8
5.9
6
6.1
6.2
0 20 40 60 80 100 120 140 160 180 200 220
Vdd=+7.5V
Vdd=+10.0V
Vdd=+16.5V
DRAIN LOAD CURRENT (mA)
DRAIN VOLTAGE VDRAIN (V)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 4
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
VDIG Load Regulation Over Temperature
VNEG Load Regulation Over Temperature [2] VNEG Load Regulation Over Temperature [3]
VDRAIN Load Regulation Over Temperature [1]
3.4
3.42
3.44
3.46
3.48
3.5
0 5 10 15 20 25 30 35
+25C
+85C
-40C
DIGITAL LOAD CURRENT (mA)
DIGITAL VOLTAGE VDIG (V)
5.7
5.8
5.9
6
6.1
6.2
0 40 80 120 160 200 240 280 320 360 400
+25C
+85C
-40C
DRAIN LOAD CURRENT (mA)
DRAIN VOLTAGE VDRAIN (V)
-2.7
-2.6
-2.5
-2.4
-2.3
0 5 10 15 20 25
+25C
+85C
-40C
NEGATIVE SINK CURRENT (mA)
NEGATIVE VOLTAGE VNEG (V)
-2.7
-2.6
-2.5
-2.4
-2.3
0 15 30 45 60 75
+25C
+85C
-40C
NEGATIVE SINK CURRENT (mA)
NEGATIVE VOLTAGE VNEG (V)
[1] Vdd = 7.5V [2] Vdd = 5V [3] Vdd - 16.5V
Enable Waveform Disable Waveform
0V
0V
0V
0V
0V
C C
0V
A A
B B
AEnable Pin, 5 V/div CVGATE, 1 V/div
BVDRAIN, 2 V/div
AEnable Pin, 5 V/div CVGATE, 1 V/div
BVDRAIN, 2 V/div
200 µs/div 200 µs/div
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 5
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Power Up Waveform
VDIG Load Transient VNEG Load Transient
Power Down Waveform
VDRAIN Load Transient VDOCC Load Transient
6V 6V
3.5V
A
B
0V
-2.5V
0mA 0mA
0mA
C
0V
D
0V
0mA
B B
B
0V
0V
C
D
B
A A
A
0V
A
B
A
AVDRAIN, 500 mV/div
BIDRAIN, 100 mA/div
ALDOCC, 200 mV/div
BIDRAIN, 100 mA/div
AVDIG, 50 mV/div
BIDIG, 20 mA/div
AVdd, 5V/div CVGATE, 1V/div
BVDRAIN, 5V/div DVNEG, 1V/div
AVdd, 5V/div CVGATE, 1V/div
BVDRAIN, 5V/div DVNEG, 1V/div
AVNEG, 50 mV/div
BINEG, 5 mA/div
20 us/div
500 us/div
5 ms/div
20 us/div
1 ms/div
10 ms/div
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 6
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Outline Drawing
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE
SOLDERED TO PCB RF GROUND.
7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
Part Number Package Body Material Lead Finish MSL Rating Package Marking [1]
HMC920LP5E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] H920
XXXX
[1] 4-Digit lot number XXXX
[2] Max peak reow temperature of 260 °C
Package Information
Absolute Maximum Ratings [1]
Vdd1, Vdd2 to GND -0.3V to +16.5V
VDIG to GND -0.3V to +5.5V
VDIGFB, PORCAP, BGCAP, EN,
CURALM, ALMTRIG to GND -0.3V to (VDIG + 0.3V)
ALMSET, ALMC1, ALMC2,
REF to GND -0.3V to (Vdd + 0.3V)
VNEGFB, VGATE, VDRAIN, ISENSE
to GND -0.3V to (Vdd + 0.3V)
VNEGIN to GND -4V to (Vdd + 0.3V)
ALML, ALMM, ALMH, LDOCC,
LDOFB to GND -0.3V to (Vdd + 0.3V)
VGATEFB, TRGOUT, VddALM,
VddCHK to GND -0.3V to (VDIG + 0.3V)
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
CPGND to GND -0.3V to +0.3V
Vdd1 to Vdd2 -0.3V to +0.3V
Junction Temperature 125 °C
Continuous Pdiss (T = 85 °C)
(Derate 256.67 mW/°C above 85 °C) 10.27 Watts
Thermal Resistance (RTH)
(Junction to package bottom) 3.9 °C/W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
ESD Sensitivity (HBM) Class 1C
Note that there are two different voltage domains on
HMC920LP5E; a high voltage domain Vdd, and a low voltage
domain VDIG. Take necessary precautions not to violate ABS
MAX ratings of each subdomains.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 7
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Pin Descriptions
Pin Number Function Description Interface Schematic
1, 2 Vdd1
Bias supply Pins. Connect supply voltage
to all these pins with appropriate ltering. Vdd1 supply
voltage should be same as Vdd2.
3VDIG 3.5V LDO output for internal use. Output capability <30mA.
Is not recommended for external use.
4VDIGFB Feedback node for VDIG LDO. Should be left oating for
regular operation.
5PORCAP
External capacitor for power-on-reset signal. 47pF to
GND is needed. If longer POR duration is needed, can be
increased.
10 ALMSET
A resistor to ground is needed. The value of the resistor
determines the alarm delay duration. The value of the
resistor can be chosen between 10K and 10M.
12 FIXBIAS
A high precision (e.g. 0.5%, ±25 ppm TCR) 10K resistor
to ground is needed. Variance in the resistance will cause
deviation in the bias current.
6BGCAP External capacitor of bandgap output. Connect a
0.1uF or greater low ESR ceramic capacitor to GND.
7EN Enable pin. System is enabled when Ven is HIGH (3.5V). IF
left oating, Ven defaults to HIGH (enabled).
9ALMTRG
Dummy alarm trigger signal to create test alarm when
taken HIGH (3.5V). Defaults to LOW (GND) when left
oating.
8CURALM Over/under current alarm
(Generates an active HIGH signal).
24 TRGOUT
Trigger out signal. Generates a HIGH (3.5V) signal when
the active bias system stabilizes. This signal can be
used to trigger next device (ENABLE) if more than one
HMC920LP5E is used in a daisy chain.
31 VddALM Generates an active LOW signal if Vdd1 drops below 3.5V.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 8
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Pin Number Function Description Interface Schematic
13 VREF 1.5V reference voltage. 0.1uF or greater capacitor to GND
is needed for noise ltering.
14 Vdd2
Bias supply for negative voltage generator. Connect supply
voltage with appropriate ltering. Vdd2 supply voltage
should be same as Vdd1.
15 CPOUT
Negative voltage generator charge pump output. Negative
voltage generator needs a ying capacitor, a reservoir
capacitor and two diodes to operate. Please refer to the
application schematic for more info.
16 DGND Digital ground domain (DGND).
11, 17 AGND Analog ground domain (GND).
18 VNEGFB
Feedback (Control) pin for Negative Voltage Genera-
tor Charge Pump. Float to activate the negative voltage
generator / Sort to GND to disable the negative voltage
generator.
19 VNEGIN
Negative input to the chip. Should be supplied with CPOUT
when negative voltage generator is enabled, or connect to
external VSS when negative voltage generator is enabled.
For detailed usage please refer to the “Negative Voltage
Generator” section.
20 VGATEFB
Control pin for VGATEFB. Float VGATEFB when a
depletion mode transistor is biased. Selects the mode of
operation along with VNEGFB pin. For detailed usage
please refer to the Table 1. Mode Selection.
Pin Descriptions (Continued)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 9
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Pin Number Function Description Interface Schematic
21 VGATE
Gate Control pin for external amplier. Connect to the gate
(base) of the external amplier. In order to guarantee stabil-
ity, a 10µF capacitor should be connected between the
gate (base) terminal of the external amplier and GND as
close to the amplier as possible.
22, 23 VDRAIN
Drain voltage. Should be connected to the supply
terminal of the external amplier. A minimum 100 nF
capacitor has to be placed close to the external amplier to
improve load regulation.
25 ISENSE
To adjust the bias current of the external amplier connect
a resistor (Rsense) from ISENSE pin to GND. Use Eqn.4 to
determine the required Rsense value.
26 ALML
A high precision resistor (e.g. 0.5%, ±25 ppm TCR) to GND
is needed. The value of the resistor sets the threshold
value for under current alarm. Please refer to the “Over/
Under Current Alarm” section for a detailed explanation.
27 ALMM
A high precision resistor (e.g. 0.5%, ±25 ppm TCR)
between ALML and ALMM is needed. The total external
resistance from ALMM pin to GND should always be equal
to 5 kΩ. Please refer to the “Over/Under Current Alarm”
section for a detailed explanation.
28 ALMH
A high precision resistor (e.g. 0.5%, ±25 ppm TCR) to
ALMM pin is needed. The value of the resistor sets the
threshold value for over current alarm. Please refer to
the “Over/Under Current Alarm” section for a detailed
explanation.
Pin Descriptions (Continued)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 10
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Pin Descriptions (Continued)
Pin Number Function Description Interface Schematic
29 LDOCC
High voltage LDO output pin. To ensure stability,
connect a 10 µF capacitor with ESR>200 mΩ from
LDOCC to GND. A tantalum capacitor is recommended to
meet the ESR requirement.
30 LDOFB Feedback pin of the VDRAIN LDO. VDRAIN voltage
is set by two resistors calculated with Eqn. 2.
32 VddCHK Should be left oating for regular operation.
Paddle GND PAD Analog ground (AGND).
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 11
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Simplied Application Circuit
Notes:
[1] A variable resistor is assembled on R4 slot to adjust bias current for evaluating various different ampliers without
soldering.
[2] A variable resistor is assembled on R1 slot to adjust VDRAIN voltage for evaluating various different ampliers without
soldering.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 12
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Simplied Evaluation PCB
List of Materials for Simplied Evaluation PCB EVAL01-HMC920LP5E [1]
Item Description
TP1-TP6 DC Test Point
C1 100 nF Capacitor, 0402 Pkg.
C2, C7 10 µF Capacitor, Case B Tantalum
C3 22 µF Capacitor, Tantalum.
C4 100 pF Capacitor, 0402 Pkg.
C5, C10 4.7 µF Capacitor, 0603 Pkg.
C6, C11 10 µF Capacitor, 0603 Pkg.
C9 330 nF Capacitor, 0603 Pkg.
D1 Dual Schottky Diode (Digi-Key part
number: BAT54SLT1)
R1 50k Ohm Trim Potentiometer
R4 5k Ohm Trim Potentiometer
R2, R13 10k Ohm Resistor, 0402 Pkg.
R6 4.99k Ohm, 0402 Pkg.
R7 270 Ohm, 0402 Pkg.
U1 HMC920LP5E Active Bias Controller
PCB [2] EVAL01-HMC920LP5E Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: FR4
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 13
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Full Featured Application Circuit
Notes:
[1] A variable resistor is assembled on R19 slot to adjust bias current for evaluating various different ampliers without
soldering.
[2] A variable resistor is assembled on R10 slot to adjust VDRAIN voltage for evaluating various different ampliers
without soldering.
[3] SW2’s function is to ENABLE and DISABLE the “Active Bias Control” function of the HMC920LP5E.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 14
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Full Featured Evaluation PCB
Careful PCB layout is critical to achieve stable and
low noise operation. The negative voltage genera-
tor charge pump stage requires particular attention.
To isolate the charge pump switching noise from the
analog circuit blocks, create two separate ground
planes dedicated to AGND and DGND connections.
Connect AGND (pin#17) and DGND (pin#16) pins to
the paddle at a single point under the package. Con-
nect all the components connected to the charge
pump (D1, C12 and C14 in the application circuit) to
DGND plane, and connect rest of the external compo-
nents to a low noise AGND.
List of Materials for Full Featured Evaluation PCB 130511 [1]
Item Description
TP2, TP8 - TP11,
TP14, TP15, TP17 DC Test Point
C2 47 pF Capacitor, 0402 Pkg.
C5, C9 10 µF Capacitor, Case B Tantalum
C6, C14 4.7 µF Capacitor, 0805 Pkg.
C12, C21 10 µF Capacitor, 0805 Pkg.
C13 0.33 µF Capacitor, 0603 Pkg.
C19 22 µF Capacitor, Tantalum
C20 0.1 µF Capacitor, 0402 Pkg.
C22 0.1 µF Capacitor, 0805 Pkg.
C24 100 pF Capacitor, 0603 Pkg.
R2, R29 0 Ohm Resistor, 0805 Pkg.
R4 270 Ohm Resistor, 0402 Pkg.
R5, R26 10 kOhm Resistor, 0603 Pkg.
R10 50 kOhm Potentiometer
R14 1 kOhm Resistor, 0603 Pkg.
R15 3.32 kOhm Resistor, 0603 Pkg.
R16 1.69 kOhm Resistor, 0603 Pkg.
R19 5 kOhm Potentiometer
R20, R22 1.8M Ohm Resistor, 0603 Pkg.
R27 10 kOhm 0.5% ±25ppm/°C
Resistor, 0402 Pkg.
R28 0 Ohm Resistor, 0402 Pkg.
Item Description
D1 Dual Schottky Diode (Digi-Key part
number: BAT54SLT1GOSCT-ND)
SW1 DIP 4 Position Half-Pitch Switch
SW2 DIP 2 Position Half-Pitch Switch
U1 HMC920LP5E Active Bias Controller
PCB [2] 128399 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: FR4
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 15
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Application Notes
Detailed Description
HMC920LP5E is an active bias controller which can be congured to provide the supply voltage and adjust the
gate voltage of an external amplier to achieve constant bias current. It can be used to bias both enhancement and
depletion type ampliers. The HMC920LP5E achieves excellent bias stability over supply and temperature variations.
The gate control can both sink and source current (±4 mA) to achieve constant bias current over input power variations.
The HMC920LP5E standard application circuit generates 3.5V digital supply voltage (VDIG) for internal use, and
-2.5V negative voltage (VNEG) for depletion mode devices. If an external negative supply is already available or an
enhancement mode device is targeted, the negative voltage generator can be disabled.
HMC920LP5E controls the bias current of the external amplier with the gate control block. The current passing
through the external amplier is sampled and is used to control the VGATE voltage connected to the gate of the external
amplier to achieve constant quiescent bias through the external amplier. This active bias control continuously
adjusts the VGATE voltage to achieve constant bias current through the targeted amplier independent of supply,
temperature, process variations, and threshold shifts due to aging.
HMC920LP5E ensures safety of the external
amplier during turn on/off by adjusting the
sequence of VDRAIN and VGATE outputs. The
current passing through the external amplier is
monitored continuously. If a fault conditions arises
(either under or over current) an alarm signal is
generated (CURALM, active HIGH). A different alarm
signal is generated (VddALM, active LOW) if the
HMC920LP5E supply voltage drops below a certain
threshold. Both supply voltage and current alarm
signals provided in HMC920LP5E does not affect the
operation of the controller. Both alarms has designed
for monitoring purposes where a system level
protection can be implemented with external control
circuitry. The HMC920LP5E has power foldback and
short circuit protection features.
The HMC920LP5E is a system on chip solution for
the biasing needs of RF ampliers and it has several
functional blocks (see functional block diagram on
the rst page), to achieve the features summarized
above. Refer to the section of the specic functional
block for the detailed operation and adjustment
descriptions.
Typical Application Diagram
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 16
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Low Voltage Linear Regulator (VDIG)
Place the R1 and R3 resistor as close as possible to the VDIG FB pin.
To ensure stable operation of VDIG, bypass VDIG to AGND with a 10µF tantalum capacitor (with RESR > 200mΩ)
under full-load conditions.
The HMC920LP5E requires a low voltage bias rail (3.3V to 5V) for internal circuitry. An internal linear regulator
produces a preset 3.5V low-current VDIG output. VDIG powers the internal logic circuitry, oscillator and the control of
the negative charge pump. VDIG supplies a maximum of 30mA current and therefore it is recommended for external
use only for light loading.
If needed the VDIG output can be adjusted externally through R1 and R3, to a maximum of 5V. To adjust the VDIG
value, set R1 to 10kΩ and determine the value of R3 using the equation (1):
If a 3.3V/5V supply is already available externally, internal low-voltage regulator can be disabled to increase the overall
system efficiency. To deactivate the internal low-voltage regulator, connect a 0Ohm resistor on R3 (depopulate R1),
and connect the external supply to VDIG pin. The typical current consumption from VDIG pin is less than 5mA. The
correct power up sequence is GND, VDD, VDIG, VNEG, and signal pins.
Reference (BGCAP)
The HMC920LP5E employs two reference voltage generators. The rst reference voltage generates 2.5V accurate
to ±5% over temperature, supply, and load variations.. This reference voltage generator is used to bias VDIG LDO.
A second reference generator generates a stable 2V reference accurate to ±2% over temperature, supply, and load
variations. In order to decrease noise, it is recommended to bypass BGCAP to AGND with a 0.1μF or greater ceramic
capacitor, as close as possible to the BGCAP pin as possible.
R3 = x (VDIG - 2.5) (1)
R1
2.5
Figure 1. Low Voltage Linear Regulator (VDIG) Block Diagram
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 17
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Negative Voltage Generator (VNEGOUT)
The HMC920LP5E has an internal regulated charge pump block to generate negative voltage (VNEGOUT) required
for depletion mode devices. The HMC920LP5E generates -2.5V at the VNEGOUT output in default conguration.
Contact factory if a voltage rail different than -2.5V is required.
The HMC920LP5E is designed to reject the ripple on the VNEGOUT by isolating VNEGOUT from the VGATE.
The negative voltage is required only for depletion mode devices, and it can be disabled through the VGATEFB and
VNEGFB pins. See Table-1 how to set the operation mode.
Enable/Disable (EN)
The active bias control loop is enabled when EN is pulled up to VDIG, and it is disabled when it is pulled down to GND.
If EN is left oating HMC920LP5E is enabled through the internal weak pull-up. Note that LDOCC, VDIG and VNEG
operation is independent of EN condition. EN signal controls the operation of only VGATE and VDRAIN outputs. When
EN pulled down to GND, HMC920LP5E discharges VDRAIN down to GND and it pulls the VGATE down to VNEG.
Please see the “Active Bias Control Loop” section for detailed explanation.
Where VDRAIN is the supply voltage of the external amplier and IDRAIN is the desired constant bias current through the
external amplier.
To ensure stable operation of the LDOCC output, bypass LDOCC to AGND with a 10µF tantalum capacitor (with RESR
> 200mΩ).
The HMC920LP5E has power foldback and short circuit protection, refer to the respective section for detailed
description of these features.
VLDOCC = VDRAIN + IDRAIN x 0.5 (3)
Place the R8 and R5 as close as possible to the LDOFB.
High Voltage Linear Regulator (LDOCC/VDRAIN)
The HMC920LP5E has an adjustable high-voltage, high-current linear regulator (LDOCC) to provide the drain supply
rail of the external RF amplier. The LDOCC output can source up to 500mA loads. The LDOCC output can be
adjusted to regulate any voltage level from 3V to 15V through external resistors R8 and R5.
To adjust the LDOCC, set R5 to 10kΩ and determine the value of R8 using the equation (2):
R8 = x (VDOCC - 2) (2)
R5
2
The LDOCC output is connected to the VDRAIN output through an internal MOSFET (RDS-ON = 0.5Ω) switch.
This internal MOSFET is controlled through power-up sequencing which ensures that no voltage is applied to drain of
the external amplier until the gate voltage is pulled down to VNEG(ensuring external amplier disabled). Connect the
external amplier to the VDRAIN output to use power-up sequencing feature.
Note that there will be a voltage drop from LDOCC to VDRAIN due to nite RDS_ON resistance of the internal switch.
To compensate for this voltage drop choose the LDOCC value as shown in equation (3).
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 18
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Active Bias Control Loop
The HMC920LP5E regulates the bias current (IDRAIN) of the external amplier through VGATE output connected to
the gate of the external amplier. In this closed loop operation the current passing through the external amplier is
sampled and is used to adjust VGATE to achieve constant quiescent bias through the external amplier.
The HMC920LP5E continuously compensates for any supply, temperature, process variations and threshold drifts
due to aging, without any calibration.
The gate control of the HMC920LP5E can both sink and source current (at least ±4 mA) to achieve constant bias
current over input power variations.
The bias current passing through the external amplier can be adjusted with RSENSE, where RSENSE is the total resistor
(R4 + R19) connected from ISENSE to GND. Use the relation given in equation (4) to set the desired bias current
through the external amplier.
Power Foldback
The HMC920LP5E employs a power foldback protection feature to limit the power consumption on the HMC920LP5E
package under excessive loading such as a short circuit from VDRAIN to GND.
HMC920LP5E senses the instantaneous power consumption over the VDRAIN LDO (PSENSE = (Vdd-VDRAIN)
x IDRAIN), and limits the instantaneous power consumption less than 4.5W. This is achieved by decreasing VDRAIN
voltage and IDRAIN current simultaneously.
The advantage of the power foldback protection feature over a hard current limit is safe operation with higher user
exibility.
The following plots present the power foldback characteristic over Vdd.
RSENSE adjustment is referenced to the total resistance seen from ALMM (PIN#27) to GND. Connect 5 kΩ resistor from
ALMM to GND (R16 + R15) to ensure equation (4) holds.
IDRAIN = A (4)
165
RSENSE
Power Foldback VDRAIN vs. IDRAIN
over Vdd
Power Foldback Delivered Power
vs. IDRAIN Over Vdd
0
1
2
3
4
0 100 200 300 400 500 600 700 800
Vdd = 6V
Vdd = 9V
Vdd = 12V
Vdd = 15V
IDRAIN (mA)
VDRAIN (V)
0
0.5
1
1.5
2
2.5
0 100 200 300 400 500 600 700 800
Vdd = 6V
Vdd = 9V
Vdd = 12V
Vdd = 15V
IDRAIN (mA)
POWER DELIVERED FROM VDRAIN (W)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 19
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Over/Under Current Alarm
The HMC920LP5E provides over and under current alarm indicator CURALM (pin#8) signal. The CURALM is pulled
up to VDIG when the IDRAIN current exceeds ± 25% of IDRAIN regulation target value.
The condition of CURALM signal does not effect the operation of HMC920LP5E, it is provided only for monitoring
purposes.
The CURALM signal is activated if the low and high current duration is longer than a certain threshold. This duration
can be adjusted through the external resistor R26 with equation 5. Figure-2 presents a behavioral sketch how the
CURALM indicator signal acts under various IDRAIN conditions.
Twait = R26x5.1x10-4+3
where Twait is in micro seconds. Changing R26 from 10 kOhms to 10 Megohms, Twait can be adjusted from 8.1 usec
to 51 msec.
Power Dissipated on HMC920LP5E
vs. IDRAIN Over Vdd
Short Circuit Protection
The pass transistor in every LDO is in series with the load, and a large amount of current will ow through the regulator
during a short condition when no precaution circuitry is included in the system. The HMC920LP5E limits the current
through the pass transistor to less than 900 mA, and this current limit acts as the secondary short circuit protection
to the power foldback feature. During a VDRAIN-GND short circuit HMC920LP5E also pulls down the VGATE to the
lowest voltage supply VNEG, and disables the external amplier completely for safety.
HMC920LP5E continuously checks the following pins for short conditions and disables the system when a short to
ground is detected.
-LDOCC
-VDRAIN
-VNEGIN (in depletion mode)
-FIXBIAS
0
1
2
3
4
5
0 100 200 300 400 500 600 700 800
Vdd = 6V
Vdd = 9V
Vdd = 12V
Vdd = 15V
IDRAIN (mA)
POWER DISSIPATED (W)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 20
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Vdd Under-Voltage Alarm
The HMC920LP5E provides a low Vdd indicator signal (VddALM pin#31) when the Vdd supply voltage is lower than
an user adjustable threshold value. VddALM pin pulled down to GND when the Vdd voltage is lower than the adjusted
VddTHR value. To adjust the Vdd under-voltage alarm threshold set R6 (the resistance from VddCHK to AGND)
according to the relation provided in (6).
Power-up and Enable Sequencing
To ensure the safety of the external amplier the HMC920LP5E provides a certain power-up sequence for enabling
active bias control loop. During start-up VDRAIN is kept at GND while VGATE is taken to the most negative supply
available (VGATE=VNEG). This ensures that external amplier is completely turned-off before VDRAIN is applied.
When EN signal is received VDRAIN is applied and the active bias loop is enabled. The nal phase of the power-up
sequence is completed by increasing the VGATE linearly until the set IDRAIN value is achieved.
For power-down and disabling the same sequencing is applied in the reverse order.
(6)
Figure 2. Current Alarm Behavior
Daisy-Chain Operation
HMC920LP5E produces a trigger out signal (TRGOUT pin#24) when the external amplier achieves a stable bias
current (IDRAIN). This trigger signal can be used to enable additional HMC920LP5E chips in a chain of ampliers.
The triggering sequence can be routed in anyway, from input to output, or from output to input depending on the
use. Figure-3 presents a sample use of three HMC920LP5Es in an amplier chain. Please note that, only one of the
HMC920LP5E is used to generate the negative voltage and the remaining HMC920LP5E is set to receive external
negative voltages (which is provided from the master HMC920LP5E). Generating negative voltage only with single
HMC920LP5E reduces the number of the components in the system, and decreases the over all current consumption
slightly, compared to each bias controller generating its own negative voltage.
To ensure proper start-up, the system enable signal should ne applied to the chip that has the negative voltage
generator.
13
88.0
3
150
6
VddTHR
k
R
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 21
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Operation Modes
HMC920LP5E can be congured to bias both enhancement and depletion mode external ampliers. The mode of
operation can be selected by setting two pins (VNEGFB, VGATEFB) as tabulated in Table-1. The connection to the
VNEGIN should be adjusted accordingly.
In order not to bias external amplier in a wrong region, please make sure that the correct mode of operation is
selected before powering up HMC920LP5E.
HMC920LP5E does not allow the internal negative voltage generator to work if an enhancement mode is selected.
Therefore, if VNEGFB is left oating while VGATEFB is grounded, HMC920LP5E will stay in standby mode.
Please note that the external negative voltage should be between -2.5V to -3.5V for HMC920LP5E to operate.
Table 1. Mode Selection
VNEGFB VGATEFB VNEGIN Description
MODE1
(Depletion/Master Mode) FLOAT F L O AT Connected to
VNEGOUT
Depletion mode transistor. Internal negative voltage generator is
active and generates -2.5V. Sample application schematic given
shown in Fig.4a.
MODE2
(Depletion/Slave Mode) GND F L OAT Connected to
External VSS
Depletion mode transistor. Internal negative voltage generator is
disabled. An external negative voltage less than -2.3V should be
connected to VNEGIN. Sample application schematic given shown
in Fig.4b.
--- FLOAT GND N/A Not allowed. HMC920LP5E stays in standby.
MODE3
(Enhancement Mode) GND GND Connected to
GND
Enhancement mode transistor. Internal negative voltage generator is
disabled. Sample application schematic given shown in Fig.5.
Figure 3. Daisy Chain Operation
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 22
DC POWER MANAGEMENT - SMT
13
HMC920LP5E
v07.1013 ACTIVE BIAS CONTROLLER
Figure 4a: Depletion/Master Mode Amplier Typical Application Circuit (Mode 1)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
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Figure 4b: Depletion/Slave Mode Amplier Typical Application Circuit (Mode 2)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 24
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Figure 5: Enhancement Mode Amplier Typical Application Circuit (Mode 3)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 25
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Table 2 - List of Bias Settings for Various Hittite Ampliers
Hittite Part Number VDRAIN (V) IDRAIN (mA) LDOCC (V) RSENSE (kΩ) R8 (kΩ)
LNAs
HMC609LC4 6170 6.09 1.0 20.4
HMC594LC3B 6100 6.05 1.7 20.3
HMC753LP4 555 5.03 3.0 15.1
HMC490LP5 5200 5.10 0.8 15.5
HMC504LC4B 490 4.05 1.8 10.2
HMC-ALH140 460 4.03 2.8 10.2
HMC-ALH244 445 4.02 3.7 10.1
HMC772LC4 445 4.02 3.7 10.1
HMC752LC4 370 3.04 2.4 5.2
Gain Blocks & Drivers
HMC635LC4 5280 5.14 0.6 15.7
HMC-AUH256 5295 5.15 0.6 15.7
Linear & Power
HMC757 7395 7. 2 0 0.4 26.0
HMC441LM1 590 5.05 1.8 15.2
HMC442LM1 /
HMC442LC3B 585 5.04 1.9 15.2
HMC-ABH209 580 5.04 2.1 15.2
HMC-APH403 5475 5.24 0.3 16.2
HMC-APH596 5400 5.20 0.4 16.0
HMC608LC4 5310 5.16 0.5 15.8
HMC498LC4 5250 5.13 0.7 15.6
HMC-ABH241 5220 5 .11 0.8 15.6
HMC499LC4 5200 5.10 0.8 15.5
HMC-APH196 4.5 400 4.70 0.4 13.5
HMC-APH633 4240 4.12 0.7 10.6
HMC-AUH317 4160 4.08 1.0 10.4
HMC-AUH318 4160 4.08 1.0 10.4
HMC-AUH320 4130 4.07 1.3 10.3
HMC863 6375 6.19 0.4 20.9
Wideband (Distributed)
HMC637LP512 400 12.20 0.4 51.0
HMC619LP5 12 300 12.15 0.55 50.8
HMC559 10 400 10.20 0.4 41.0
HMC562 880 8.04 2 .1 30.2
HMC460LC5 875 8.04 2.2 30.2
HMC659LC5 8300 8.15 0.6 30.8
HMC464LP5 8290 8.15 0.6 30.7
HMC459 8290 8.15 0.6 30.7
HMC465LP5 8160 8.08 1.0 30.4
HMC462LP5 566 5.03 2.5 15.2
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com 13 - 26
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Table 2 - List of Bias Settings for Various Hittite Ampliers (Continued)
Hittite Part Number VDRAIN (V) IDRAIN (mA) LDOCC (V) RSENSE (kΩ) R8 (kΩ)
HMC463LP5 560 5.03 2.8 15.2
HMC635 5280 5.14 0.6 15.7
HMC634LC4 5180 5.09 0.9 15.5
HMC633LC4 5180 5.09 0.9 15.5
HMC795LP5E 10 400 10.20 0.4 41.0
Microwave & Optical Drivers
HMC870LC5 7165 7.0 8 1.0 25.4
HMC871LC5 875 8.04 2.2 30.2
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
For price, delivery, and to place orders: Analog Devices, Inc.,
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: 781-329-4700 • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D