2 of 11 DS100526
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NOT FOR NEW DESIGNS
FPD750SOT343E
Biasing Guidelines
Active bias circuits provide good performance stabilization over variations of operating temperature, but require a larger num-
ber of components compared to self-bias or dual-biased. Such circuits should include provisions to ensure that gate bias is
applied before drain bias, otherwise the pHEMT may be induced to self-oscillate. Contact your Sales Representative for addi-
tional Information.
Dual-bias circuits are relatively simple to implement, but will require a regulated negative voltage supply for depletion-mode
devices.
For standard Class A operation, a 50% of IDSS bias point is recommended. A small amount of RF gain expansion prior to onset
of compression is normal for this operating point. A class A/B bias of 25% to 33% offers an optimized solution for NF and OIP3.
Note: The recommended method for measuring IDSS, or any particular
IDS, is to set the drain-source voltage (VDS) at 1.3V. This measurement
point avoids the onset of spurious self-oscillation which would normally
distort the current measurement (this effect has been filtered from the
I-V curves presented). Setting the VDS> 1.3V will generally cause errors
in the current measurements, even in stabilized circuits.
Absolute Maximum Ratings1
Parameter Rating Unit
Drain-Source Voltage (VDS)
(-3V<VGS <-0.5V)
6V
Gate-Source Voltage (VGS)
(0V<VDS <+8V)
-3 V
Drain-Source Current (IDS)
(For VDS>2V)
IDSS
Gate Current (IG)
(Forward or reverse)
7.5 m A
RF Input Power (PIN)2
(Under any acceptable bias state)
22 dBm
Channel Operating Temperature (TCH)
(Under any acceptable bias state)
175 °C
Storage Temperature (TSTG)
(Non-Operating Storage)
-55 to 150 °C
Total Power Dissipation (PTOT)3, 4, 5 1.1 W
Gain Compression
(Under any bias conditions) 5dB
Simultaneous Combination of Limits6
(2 or more max. limits)
80 %
Notes:
1TAMBIENT =22°C unless otherwise noted; exceeding any one of these absolute max-
imum ratings may cause permanent damage to the device.
2Max. RF input limit must be further limited if input VSWR>2.5:1.
3Users should avoid exceeding 80% of 2 or more Limits simultaneously.
4Total Power Dissipation (PTOT) defined as (PDC +PIN)–POUT, where PDC: DC Bias
Power, PIN: RF Input Power, POUT: RF Output Power.
Total Power Dissipation to be de-rated as follows above 22°C:
PTOT =1.1-(1/JC)xTPACK, where TPACK =source tab lead temperature above
22°C and JC=143°C/W.
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical perfor-
mance or functional operation of the device under Absolute Maximum Rating condi-
tions is not implied.
RoHS status based on EUDirective2002/95/EC (at time of this document revision).
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended appli-
cation circuitry and specifications at any time without prior notice.
DC IV Curv es F PD 75 0SOT89
0. 00
0. 05
0. 10
0. 15
0. 20
0. 25
0. 30
0.0 0. 5 1 .0 1 .5 2.0 2. 5 3. 0 3.5 4.0 4.5 5 .0 5.5 6. 0
Dr a i n- Sou r ce Vo l t ag e (V)
Drai n-Sour ce Current ( A)
VG = - 1. 5 0
VG = - 1 . 2 5 V
VG = - 1 . 0 0 V
VG = - 0 . 7 5 V
VG = - 0 . 5 0 V
VG = - 0 . 2 5 V
VG =0V