Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
Comlinear® CLC1606
1.3GHz Current Feedback Amplier
Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 - Fax. +1 510 668-7001
FEATURES
n 1.2GHz -3dB bandwidth at G=2
n 3,300V/μs slew rate
n 0.01%/0.01˚ differential gain/
phase error
n 7.5mA supply current
n 875MHz large signal bandwidth
n 120mA output current (easily drives
three video loads)
n Fully specied at 5V and ±5V supplies
n CLC1606: Pb-free SOT23-5
n CLC1606: Pb-free SOIC-8
APPLICATIONS
n RGB video line drivers
n High denition video driver
n Video switchers and routers
n ADC buffer
n Active lters
n High-speed instrumentation
n Wide dynamic range IF amp
General Description
The COMLINEAR CLC1606 is a high-performance, current feedback amplier
with superior bandwith and video specications. The CLC1606 provides
1.3GHz unity gain bandwidth, ±0.1dB gain atness to 150MHz, and provides
3,300V/μs slew rate exceeding the requirements of high-denition television
(HDTV) and other multimedia applications. The COMLINEAR CLC1606 high-
performance amplier also provide ample output current to drive multiple
video loads.
The COMLINEAR CLC1606 is designed to operate from ±5V or +5V supplies.
It consumes only 7.5mA of supply current. The combination of high-speed
and excellent video performance make the CLC1606 well suited for use in
many general purpose, high-speed applications including standard denition
and high denition video. Data communications applications benet from
the CLC1606’s total harmonic distortion of -68dBc at 10MHz and fast settling
time to 0.1%.
Typical Application - Driving Dual Video Loads
Ordering Information
Part Number Package Pb-Free RoHS Compliant Operating Temperature Range Packaging Method
CLC1606IST5X SOT23-5 Yes Yes -40°C to +85°C Reel
CLC1606ISO8 SOIC-8 Yes Yes -40°C to +85°C Rail
CLC1606ISO8X SOIC-8 Yes Yes -40°C to +85°C Reel
Moisture sensitivity level for all parts is MSL-1.
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 2/18 Rev 1D
SOT23-5 Pin Assignments
Pin No. Pin Name Description
1OUT Output
2-VSNegative supply
3+IN Positive input
4-IN Negative input
5+VSPositive supply
SOT23-5 Pin Conguration
2
3
5
4
+IN
+VS
-IN
1
-VS
OUT
-
+
SOIC Pin Assignments
Pin No. Pin Name Description
1NC No connect
2-IN1 Negative input, channel 1
3+IN1 Positive input, channel 1
4-VSNegative supply
5NC No connect
6OUT Output
7+VSPositive supply
8NC No connect
SOIC Pin Conguration
2
3
45
6
7
8
+IN1
NC
OUT
NC
1
-IN1
NC
-VS
+VS
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 3/18 Rev 1D
Absolute Maximum Ratings
The safety of the device is not guaranteed when it is operated above the “Absolute Maximum Ratings”. The device
should not be operated at these “absolute” limits. Adhere to the “Recommended Operating Conditions” for proper de-
vice function. The information contained in the Electrical Characteristics tables and Typical Performance plots reect the
operating conditions noted on the tables and plots.
Parameter Min Max Unit
Supply Voltage 0 14 V
Input Voltage Range -Vs -0.5V +Vs +0.5V V
Continuous Output Current 120 mA
Reliability Information
Parameter Min Typ Max Unit
Junction Temperature 150 °C
Storage Temperature Range -65 150 °C
Lead Temperature (Soldering, 10s) 260 °C
Package Thermal Resistance
5-Lead SOT23 221 °C/W
8-Lead SOIC 100 °C/W
Notes:
Package thermal resistance (qJA), JDEC standard, multi-layer test boards, still air.
ESD Protection
Product SOT23-5
Human Body Model (HBM) (1) 2kV
Charged Device Model (CDM) 1kV
Notes:
1. 0.8kV between the input pairs +IN and -IN pins only. All other pins are 2kV.
Recommended Operating Conditions
Parameter Min Typ Max Unit
Operating Temperature Range -40 +85 °C
Supply Voltage Range 4.5 12 V
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 4/18 Rev 1D
Electrical Characteristics at +5V
TA = 25°C, Vs = +5V, Rf = 270Ω, RL = 150Ω to VS/2, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBW -3dB Bandwidth G = +1, Rf = 390Ω, VOUT = 0.5Vpp 1000 MHz
BWSS -3dB Bandwidth G = +2, VOUT = 0.5Vpp 900 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 1Vpp 800 MHz
BW0.1dBSS 0.1dB Gain Flatness G = +2, VOUT = 0.5Vpp 132 MHz
BW0.1dBLS 0.1dB Gain Flatness G = +2, VOUT = 1Vpp 140 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 1V step; (10% to 90%) 0.6 ns
tSSettling Time to 0.1% VOUT = 1V step 10 ns
OS Overshoot VOUT = 0.2V step 1 %
SR Slew Rate 1V step 1500 V/µs
Distortion/Noise Response
HD2 2nd Harmonic Distortion 1Vpp, 5MHz -74 dBc
HD3 3rd Harmonic Distortion 1Vpp, 5MHz -70 dBc
THD Total Harmonic Distortion 1Vpp, 5MHz 68 dB
IP3 Third-Order Intercept 1Vpp, 10MHz 36 dBm
DGDifferential Gain NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 %
DPDifferential Phase NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 °
enInput Voltage Noise > 1MHz 3nV/√Hz
ini Input Current Noise > 1MHz, Inverting 20 pA/√Hz
> 1MHz, Non-inverting 30 pA/√Hz
DC Performance
VIO Input Offset Voltage 0 mV
dVIO Average Drift 3.7 µV/°C
Ibn Input Bias Current - Non-Inverting ±3.0 µA
dIbn Average Drift 100 nA/°C
Ibi Input Bias Current - Inverting ±6.0 µA
dIbi Average Drift 56 nA/°C
PSRR Power Supply Rejection Ratio DC 55 dB
ISSupply Current 6.5 mA
Input Characteristics
RIN Input Resistance Non-inverting 150 kΩ
Inverting 70 Ω
CIN Input Capacitance 1.0 pF
CMIR Common Mode Input Range ±1.5 V
CMRR Common Mode Rejection Ratio DC 50 dB
Output Characteristics
ROOutput Resistance Closed Loop, DC 0.1 Ω
VOUT Output Voltage Swing RL = 150Ω ±1.5 V
IOUT Output Current ±120 mA
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 5/18 Rev 1D
Electrical Characteristics at ±5V
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBW -3dB Bandwidth G = +1, Rf = 390Ω, VOUT = 0.5Vpp 1300 MHz
BWSS -3dB Bandwidth G = +2, VOUT = 0.5Vpp 1200 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 2Vpp 875 MHz
BW0.1dBSS 0.1dB Gain Flatness G = +2, VOUT = 0.5Vpp 150 MHz
BW0.1dBLS 0.1dB Gain Flatness G = +2, VOUT = 2Vpp 150 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 2V step; (10% to 90%) 0.5 ns
tSSettling Time to 0.1% VOUT = 2V step 13 ns
OS Overshoot VOUT = 0.2V step 1 %
SR Slew Rate 2V step 3300 V/µs
Distortion/Noise Response
HD2 2nd Harmonic Distortion 2Vpp, 5MHz -71 dBc
HD3 3rd Harmonic Distortion 2Vpp, 5MHz -71 dBc
THD Total Harmonic Distortion 2Vpp, 5MHz -68 dB
IP3 Third-Order Intercept 2Vpp, 10MHz 39 dBm
DGDifferential Gain NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 %
DPDifferential Phase NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 °
enInput Voltage Noise > 1MHz 3nV/√Hz
ini Input Current Noise - Inverting > 1MHz, Inverting 20 pA/√Hz
> 1MHz, Non-inverting 30 pA/√Hz
DC Performance
VIO Input Offset Voltage(1) -10 0.5 10 mV
dVIO Average Drift 3.7 µV/°C
Ibn Input Bias Current - Non-Inverting (1) -45 ±3.0 45 µA
dIbn Average Drift 100 nA/°C
Ibi Input Bias Current - Inverting (1) -50 ±7.0 50 µA
dIbi Average Drift 56 nA/°C
PSRR Power Supply Rejection Ratio (1) DC 40 50 dB
ISSupply Current (1) 7.5 9.5 mA
Input Characteristics
RIN Input Resistance Non-inverting 150 kΩ
Inverting 170 k
CIN Input Capacitance 1.0 pF
CMIR Common Mode Input Range ±4.0 V
CMRR Common Mode Rejection Ratio (1) DC 40 50 dB
Output Characteristics
ROOutput Resistance Closed Loop, DC 0.1 Ω
VOUT Output Voltage Swing RL = 150Ω (1) ±3.0 ±3.7 V
IOUT Output Current ±280 mA
Notes:
1. 100% tested at 25°C
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 6/18 Rev 1D
Typical Performance Characteristics
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Frequency Response vs. VOUT Frequency Response vs. Temperature
Frequency Response vs. CLFrequency Response vs. RL
Non-Inverting Frequency Response Inverting Frequency Response
-9
-6
-3
0
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = 1
R
f
= 390Ω
G = 2
G = 5
G = 10
V
OUT
= 0.5V
pp
G = 1
R
f
= 499Ω
-9
-6
-3
0
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = -1
G = -2
G = -5
G = -10
V
OUT
= 0.5V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
C
L
= 1000pF
R
s
= 3.3Ω
C
L
= 500pF
R
s
= 5Ω
C
L
= 100pF
R
s
= 10Ω
C
L
= 50pF
R
s
= 15Ω
C
L
= 20pF
R
s
= 20Ω
V
OUT
= 0.5V
pp
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 0.5V
pp
R
L
= 100Ω
R
L
= 50Ω
R
L
= 25Ω
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 1V
pp
V
OUT
= 2V
pp
V
OUT
= 4V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000 10000
Normalized Gain (dB)
Frequency (MHz)
+ 85degC
-40degC
+ 25degC
V
OUT
= 0.2V
pp
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 7/18 Rev 1D
Typical Performance Characteristics
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Frequency Response vs. VOUT at VS = 5V Frequency Response vs. Temperature at VS = 5V
Frequency Response vs. CL at VS = 5V Frequency Response vs. RL at VS = 5V
Non-Inverting Frequency Response at VS = 5V Inverting Frequency Response at VS = 5V
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = 1
R
f
= 390Ω
G = 2
G = 5
G = 10
V
OUT
= 0.5V
pp
-9
-6
-3
0
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = -1
G = -2
G = -5
G = -10
V
OUT
= 0.5V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
C
L
= 1000pF
R
s
= 3.3Ω
C
L
= 500pF
R
s
= 5Ω
C
L
= 100pF
R
s
= 10Ω
C
L
= 50pF
R
s
= 15Ω
C
L
= 20pF
R
s
= 20Ω
V
OUT
= 0.5V
pp
-6
-5
-4
-3
-2
-1
0
1
2
3
4
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 0.5V
pp
R
L
= 100Ω
R
L
= 50Ω
R
L
= 25Ω
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 1V
pp
V
OUT
= 2V
pp
V
OUT
= 3V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000 10000
Normalized Gain (dB)
Frequency (MHz)
+ 85degC
-40degC
+ 25degC
V
OUT
= 0.2V
pp
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 8/18 Rev 1D
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Closed Loop Output Impedance vs. Frequency Input Voltage Noise
-3dB Bandwidth vs. VOUT at G=10 -3dB Bandwidth vs. VOUT at G=10, VS = 5V
Gain Flatness Gain Flatness at VS = 5V
-0.5
-0.3
-0.1
0.1
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 2V
pp
R
L
= 150Ω
R
f
= 270Ω
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 2V
pp
R
L
= 150Ω
R
f
= 270Ω
300
350
400
450
500
550
600
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-3dB Bandwidth (MHz)
VOUT (VPP)
G= 10
250
300
350
400
450
0.0 0.5 1.0 1.5 2.0 2.5 3.0
-3dB Bandwidth (MHz)
VOUT (VPP)
Output Resistance (Ω)
Frequency (Hz)
10K 100K 1M 10M 100M
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
VS = ±5.0V
Input Voltage Noise (nV/√Hz)
Frequency (MHz)
0.0001 0.001 0.01 0.1 1 10
0
5
10
15
20
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 9/18 Rev 1D
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
CMRR vs. Frequency PSRR vs. Frequency
2nd Harmonic Distortion vs. VOUT 3rd Harmonic Distortion vs. VOUT
2nd Harmonic Distortion vs. RL 3rd Harmonic Distortion vs. RL
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
0 5 10 15 20
Distortion (dBc)
Frequency (MHz)
R
L
= 150Ω
V
OUT
= 2V
pp
R
L
= 499Ω
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
0 5 10 15 20
Distortion (dBc)
Frequency (MHz)
R
L
= 150Ω
V
OUT
= 2V
pp
R
L
= 499Ω
-90
-85
-80
-75
-70
-65
-60
0.5 0.75 11.25 1.5 1.75 22.25 2.5
Distortion (dBc)
Output Amplitude (V
pp
)
10MHz
5MHz
1MHz
RL = 150Ω
-95
-90
-85
-80
-75
-70
-65
-60
0.5 0.75 11.25 1.5 1.75 22.25 2.5
Distortion (dBc)
Output Amplitude (V
pp
)
10MHz
5MHz
1MHz
RL = 150Ω
CMRR (dB)
Frequency (Hz)
10k 100k 1M 10M 100M
-60
-50
-40
-30
-20
-10
0
VS = ±5.0V
PSRR (dB)
Frequency (Hz)
10K 100K 1M 10M 100M
-60
-50
-40
-30
-20
-10
0
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 10/18 Rev 1D
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Differential Gain & Phase AC Coupled Output Differential Gain & Phase DC Coupled Output
Large Signal Pulse Response Large Signal Pulse Response at VS = 5V
Small Signal Pulse Response Small Signal Pulse Response at VS = 5V
-0.125
-0.1
-0.075
-0.05
-0.025
0
0.025
0.05
0.075
0.1
0.125
020 40 60 80 100 120 140 160 180 200
Voltage (V)
2.375
2.4
2.425
2.45
2.475
2.5
2.525
2.55
2.575
2.6
2.625
020 40 60 80 100 120 140 160 180 200
Voltage (V)
Time (ns)
-3
-2
-1
0
1
2
3
020 40 60 80 100 120 140 160 180 200
Voltage (V)
1
1.5
2
2.5
3
3.5
4
020 40 60 80 100 120 140 160 180 200
Voltage (V)
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
0.02
-0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
AC coupled
DP
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0.05
0.06
-0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
DC coupled
DP
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 11/18 Rev 1D
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = 270Ω, RL = 150Ω, G = 2; unless otherwise noted.
Differential Gain & Phase AC Coupled Output at VS = ±2.5V Differential Gain & Phase DC Coupled at VS = ±2.5V
-0.03
-0.025
-0.02
-0.015
-0.01
-0.005
0
0.005
0.01
-0.35 -0.25 -0.15 -0.05 0.05 0.15 0.25 0.35
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
R
L
= 150Ω
DC coupled
DP
DG
R
L
= 150Ω
AC coupled
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
0.05
-0.35 -0.25 -0.15 -0.05 0.05 0.15 0.25 0.35
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
R
L
= 150Ω
DC coupled
DP
DG
R
L
= 150Ω
DC coupled
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 12/18 Rev 1D
General Information - Current Feedback
Technology
Advantages of CFB Technology
The CLC1606 Family of ampliers utilize current feedback
(CFB) technology to achieve superior performance. The
primary advantage of CFB technology is higher slew rate
performance when compared to voltage feedback (VFB)
architecture. High slew rate contributes directly to better
large signal pulse response, full power bandwidth, and
distortion.
CFB also alleviates the traditional trade-off between
closed loop gain and usable bandwidth that is seen with
a VFB amplier. With CFB, the bandwidth is primarily
determined by the value of the feedback resistor, Rf. By
using optimum feedback resistor values, the bandwidth
of a CFB amplier remains nearly constant with different
gain congurations.
When designing with CFB ampliers always abide by these
basic rules:
• Use the recommended feedback resistor value
• Do not use reactive (capacitors, diodes, inductors, etc.)
elements in the direct feedback path
• Avoid stray or parasitic capacitance across feedback
resistors
• Follow general high-speed amplier layout guidelines
• Ensure proper precautions have been made for driving
capacitive loads
Figure 1. Non-Inverting Gain Conguration with First
Order Transfer Function
VOUT
VIN
= − Rf
Rg
+1Eq. 2
1+Rf
Zo(jω)
VIN
VOUT
Zo*Ierr
Ierr
RL
Rf
x1
Rg
Figure 2. Inverting Gain Conguration with First Order
Transfer Function
CFB Technology - Theory of Operation
Figure 1 shows a simple representation of a current
feedback amplier that is congured in the traditional
non-inverting gain conguration.
Instead of having two high-impedance inputs similar to a
VFB amplier, the inputs of a CFB amplier are connected
across a unity gain buffer. This buffer has a high impedance
input and a low impedance output. It can source or sink
current (Ierr) as needed to force the non-inverting input
to track the value of Vin. The CFB architecture employs
a high gain trans-impedance stage that senses Ierr and
drives the output to a value of (Zo(jω) * Ierr) volts. With
the application of negative feedback, the amplier will
drive the output to a voltage in a manner which tries to
drive Ierr to zero. In practice, primarily due to limitations
on the value of Zo(jω), Ierr remains a small but nite
value.
A closer look at the closed loop transfer function (Eq.1)
shows the effect of the trans-impedance, Zo(jω) on the
gain of the circuit. At low frequencies where Zo(jω) is very
large with respect to Rf, the second term of the equation
approaches unity, allowing Rf and Rg to set the gain. At
higher frequencies, the value of Zo(jω) will roll off, and
the effect of the secondary term will begin to dominate.
The -3dB small signal parameter species the frequency
where the value Zo(jω) equals the value of Rf causing the
gain to drop by 0.707 of the value at DC.
For more information regarding current feedback
ampliers, visit www.cadeka.com for detailed application
notes, such as AN-3:
The Ins and Outs of Current Feedback
Ampliers
.
VOUT
VIN
=1+Rf
Rg
+1Eq. 1
1+Rf
Zo(jω)
VIN VOUT
Zo*Ierr
Ierr
Rg
RL
Rf
x1
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 13/18 Rev 1D
Application Information
Basic Operation
Figures 3, 4, and 5 illustrate typical circuit congurations for
non-inverting, inverting, and unity gain topologies for dual
supply applications. They show the recommended bypass
capacitor values and overall closed loop gain equations.
Figure 3. Typical Non-Inverting Gain Circuit
Figure 4. Typical Inverting Gain Circuit
Figure 5. Typical Unity Gain (G=1) Circuit
CFB ampliers can be used in unity gain congurations.
Do not use the traditional voltage follower circuit, where
the output is tied directly to the inverting input. With a CFB
amplier, a feedback resistor of appropriate value must be
used to prevent unstable behavior. Refer to gure 5 and
Table 1. Although this seems cumbersome, it does allow a
degree of freedom to adjust the passband characteristics.
Feedback Resistor Selection
One of the key design considerations when using a CFB
amplier is the selection of the feedback resistor, Rf. Rf is
used in conjunction with Rg to set the gain in the traditional
non-inverting and inverting circuit congurations. Refer to
gures 3 and 4. As discussed in the Current Feedback
Technology section, the value of the feedback resistor has
a pronounced effect on the frequency response of the
circuit.
Table 1, provides recommended Rf and associated Rg
values for various gain settings. These values produce
the optimum frequency response, maximum bandwidth
with minimum peaking. Adjust these values to optimize
performance for a specic application. The typical
performance characteristics section includes plots that
illustrate how the bandwidth is directly affected by the
value of Rf at various gain settings.
Gain
(V/V Rf (Ω) Rg (Ω) ±0.1dB BW
(MHz)
-3dB BW
(MHz)
1 390 - 136 1300
2 270 270 150 1200
5 270 67.5 115 750
Table 1: Recommended Rf vs. Gain
In general, lowering the value of Rf from the recommended
value will extend the bandwidth at the expense of
additional high frequency gain peaking. This will cause
increased overshoot and ringing in the pulse response
characteristics. Reducing Rf too much will eventually
cause oscillatory behavior.
Increasing the value of Rf will lower the bandwidth.
Lowering the bandwidth creates a atter frequency
response and improves 0.1dB bandwidth performance.
This is important in applications such as video. Further
increase in Rf will cause premature gain rolloff and
adversely affect gain atness.
+
-
Rf
0.1μF
6.8μF
Output
G = - (Rf/Rg)
For optimum input offset
voltage set R1 = Rf || Rg
Input
+Vs
-Vs
0.1μF
6.8μF
RL
Rg
R1
+
-
Rf
0.1μF
6.8μF
Output
G = 1
Rf is required for CFB amplifiers
Input
+Vs
-Vs
0.1μF
6.8μF
RL
+
-
Rf
0.1μF
6.8μF
Output
G = 1 + (Rf/Rg)
Input
+Vs
-Vs
Rg
0.1μF
6.8μF
RL
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 14/18 Rev 1D
Driving Capacitive Loads
Increased phase delay at the output due to capacitive
loading can cause ringing, peaking in the frequency
response, and possible unstable behavior. Use a series
resistance, RS, between the amplier and the load to
help improve stability and settling performance. Refer to
Figure 6.
Figure 6. Addition of RS for Driving
Capacitive Loads
Table 2 provides the recommended RS for various
capacitive loads. The recommended RS values result
in <=0.5dB peaking in the frequency response. The
Frequency Response vs. CL plot, on page 5, illustrates the
response of the CLC1606 Family.
CL (pF) RS (Ω) -3dB BW (MHz)
20 20 375
100 10 180
1000 3.3 58
Table 1: Recommended RS vs. CL
For a given load capacitance, adjust RS to optimize the
tradeoff between settling time and bandwidth. In general,
reducing RS will increase bandwidth at the expense of
additional overshoot and ringing.
Parasitic Capacitance on the Inverting Input
Physical connections between components create
unintentional or parasitic resistive, capacitive, and
inductive elements.
Parasitic capacitance at the inverting input can be
especially troublesome with high frequency ampliers.
A parasitic capacitance on this node will be in parallel
with the gain setting resistor Rg. At high frequencies, its
impedance can begin to raise the system gain by making
Rg appear smaller.
In general, avoid adding any additional parasitic
capacitance at this node. In addition, stray capacitance
across the Rf resistor can induce peaking and high
frequency ringing. Refer to the Layout Considerations
section for additional information regarding high speed
layout techniques.
Overdrive Recovery
An overdrive condition is dened as the point when either
one of the inputs or the output exceed their specied
voltage range. Overdrive recovery is the time needed for
the amplier to return to its normal or linear operating
point. The recovery time varies, based on whether the
input or output is overdriven and by how much the range
is exceeded. The CLC1606 Family will typically recover
in less than 10ns from an overdrive condition. Figure 7
shows the CLC1606 in an overdriven condition.
Figure 7. Overdrive Recovery
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 1000 ohm load condition. However,
applications with low impedance, DC coupled loads
should be analyzed to ensure that maximum allowed
junction temperature is not exceeded. Guidelines listed
below can be used to verify that the particular application
will not cause the device to operate beyond it’s intended
operating range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction
temperature, the package thermal resistance value
ThetaJA (ӨJA) is used along with the total die power
dissipation.
TJunction = TAmbient + (ӨJA × PD)
Where TAmbient is the temperature of the working environment.
+
-
Rf
Input
Output
Rg
Rs
CLRL
-6
-4
-2
0
2
4
6
-1.5
-1
-0.5
0
0.5
1
1.5
020 40 60 80 100 120 140 160 180 200
Output Voltage (V)
Input Voltage (V)
Time (ns)
Output
Input
VIN = 2Vpp
G = 5
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 15/18 Rev 1D
In order to determine PD, the power dissipated in the load
needs to be subtracted from the total power delivered by
the supplies.
PD = Psupply - Pload
Supply power is calculated by the standard power equation.
Psupply = Vsupply × IRMS supply
Vsupply = VS+ - VS-
Power delivered to a purely resistive load is:
Pload = ((VLOAD)RMS2)/Rloadeff
The effective load resistor (Rloadeff) will need to include
the effect of the feedback network. For instance,
Rloadeff in gure 3 would be calculated as:
RL || (Rf + Rg)
These measurements are basic and are relatively easy to
perform with standard lab equipment. For design purposes
however, prior knowledge of actual signal levels and load
impedance is needed to determine the dissipated power.
Here, PD can be found from
PD = PQuiescent + PDynamic - PLoad
Quiescent power can be derived from the specied IS
values along with known supply voltage, VSupply. Load
power can be calculated as above with the desired signal
amplitudes using:
(VLOAD)RMS = VPEAK / √2
( ILOAD)RMS = ( VLOAD)RMS / Rloadeff
The dynamic power is focused primarily within the output
stage driving the load. This value can be calculated as:
PDYNAMIC = (VS+ - VLOAD)RMS × ( ILOAD)RMS
Assuming the load is referenced in the middle of the power
rails or Vsupply/2.
Figure 8 shows the maximum safe power dissipation in the
package vs. the ambient temperature for the 8 and 14 lead
SOIC packages.
0
0.5
1
1.5
2
-40 -20 020 40 60 80
Maximum Power Dissipation (W)
Ambient Temperature (°C)
SOT23-5
SOIC-8
Figure 8. Maximum Power Derating
Better thermal ratings can be achieved by maximizing
PC board metallization at the package pins. However, be
careful of stray capacitance on the input pins.
In addition, increased airow across the package can also
help to reduce the effective ӨJA of the package.
In the event the outputs are momentarily shorted to a low
impedance path, internal circuitry and output metallization
are set to limit and handle up to 65mA of output current.
However, extended duration under these conditions may
not guarantee that the maximum junction temperature
(+150°C) is not exceeded.
Layout Considerations
General layout and supply bypassing play major roles in
high frequency performance. Exar has evaluation boards
to use as a guide for high frequency layout and as aid in
device testing and characterization. Follow the steps below
as a basis for high frequency layout:
▪Include 6.8µF and 0.1µF ceramic capacitors for power
supply decoupling
▪Place the 6.8µF capacitor within 0.75 inches of the power pin
▪Place the 0.1µF capacitor within 0.1 inches of the power pin
▪Remove the ground plane under and around the part,
especially near the input and output pins to reduce
parasitic capacitance
▪Minimize all trace lengths to reduce series inductances
Refer to the evaluation board layouts below for more
information.
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 16/18 Rev 1D
Evaluation Board Information
The following evaluation boards are available to aid in the
testing and layout of these devices:
Evaluation Board # Products
CEB002 CLC1606IST5X
CEB003 CLC1606ISO8X
Evaluation Board Schematics
Evaluation board schematics and layouts are shown in
Figures 9-14. These evaluation boards are built for dual-
supply operation. Follow these steps to use the board in a
single-supply application:
1. Short -Vs to ground.
2. Use C3 and C4, if the -VS pin of the amplier is not
directly connected to the ground plane.
Figure 9. CEB002 Schematic
Figure 10. CEB002 Top View
Figure 11. CEB002 Bottom View
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
©2007-2013 Exar Corporation 17/18 Rev 1D
Figure 12. CEB003 Schematic
Figure 13. CEB003 Top View
Figure 14. CEB003 Bottom View
Data Sheet
Comlinear CLC1606 1.3GHz Current Feedback Amplier Rev 1D
For Further Assistance:
Exar Corporation Headquarters and Sales Ofces
48720 Kato Road Tel.: +1 (510) 668-7000
Fremont, CA 94538 - USA Fax: +1 (510) 668-7001
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specic application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to signicantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage
has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
©2007-2013 Exar Corporation 18/18 Rev 1D
Mechanical Dimensions
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SOIC-8 Package
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