Evaluation Board Document
µPG2301TQ-EVPW24-A
Evaluation Circuit Board
o Bias and Matching Circuits
o PCB Material
o Typical Performance
o Assembly Drawing
The uPG2301TQ-EVPW24-A is an evaluation circuit board for NEC’s GaAs MMIC
uPG2301TQ-A optimized for the performance in the frequency range of 2.3 to 2.5GHz. This
circuit board is RoHS compliant.
Bias and Matching and Circuits
uPG2301TQ is a two stage HBT MMIC power amplifier. The collectors of the first and second
stages are biased at Vcc1 and Vcc2 respectively. Vbias can be always at the same voltage of
Vcc1 and Vcc2, and the performance is not sensitive to Vbias to certain extent. Vcont pin is for
gain control. The control curve is shown on the data sheet. Voltage on the Venable pin controls
the operation of bias and gain control circuits. The RF output power and current are sensitive to
Venable. For the optimal performance Venable should be set at 2.9V and not exceed 3.1V. In an
application circuit a resistor divider network might be used to bias Venable if 2.9V is not
conveniently available. The maximum current into Venable is 1mA.
The device requires relatively simple input and output matching circuits. At input, a shunt
capacitor, C6, and a shunt inductor, L1, along with a small section of transmission line are used
for matching. This configuration provides flexibility for tuning to achieve an optimal
performance. The output matching circuit mainly consists of C4 and a section of trace. L2
mainly functions an RF choke.
PCB Material
The PCB is 28mil thick two-layer Getek board. The dielectric constant of Getek is 4.2.
Typical Performance
Test Conditions:
Freq=2.45GHz, Vcc1=Vcc2=Vbias=3.3V, Venable=2.9V, Vcont=2.5V, Pin=4dBm
Pout=23dBm,
Ic=120mA
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