Power amplifier

The power amplifier is a 2.5-stage GaAs HBT MMIC (a cascade stage + a common emitter stage). The output of the PA is not matched to 50 ohms, therefore an external output matching circuit is required on PCB. The PA is the final active stage in the TX chain. (part code 4340281).

Parameter

Minimum

Typical / Nominal

Maximum

Unit / Notes

Operating frequency range

890

915

MHz

DC supply voltage, Vdd

3.0

3.3

5.25

V

Leakage current

5

uA, Vcc=6V Vapc=0V, no RF drive

Control current

3

mA

Control sensitivity

20

V/V (RF rms to APC)

Dynamic range

46

50

dB

Output power 1

31.5

dBm, Vcc=3.3V T=+25°C

Output power 2

30.0

dBm, Vcc=3.0V T=+85°C

Input power

0

3

5.0

dBm

Efficiency (Po=31.5 dBm)

50

%

Input VSWR (Zo=50 ohms)

2.0

3 fo, 4 fo, 5 fo

-35

dBc, Po=31.5 dBm

Noise power (in 30 kHz band, 20 MHz above fo)

-80

dBm

Stability, Vdd < 5.5 V

VSWR 20:1

No spurious signals Pin = 10 dBm

Operating case temp. range

-20

+90

deg.C

System Module Technical Documentation

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