RF5110G_07 Datasheet, PDF (16/22 Pages) RF Micro Devices – 3V GSM POWER AMPLIFIER

RF5110G
Typical Test Setup
Power Supply
V- V+ S+ S-
RF Generator
3dB
10dB/5W
Spectrum
Analyzer
Buffer
x1 OpAmp
Pulse
Generator
A buffer amplifier is recommended because the current into the V_APC
changes with voltage. As an alternative, the voltage may be
monitored with an oscilloscope.
Notes about testing the RF5110G
The test setup shown above includes two attenuators. The 3dB pad at the input is to minimize the effect on the signal genera-
tor as a result of switching the input impedance of the PA. When V_APC is switched quickly, the resulting input impedance
change can cause the signal generator to vary its output signal, either in output level or in frequency. Instead of an attenuator
an isolator may also be used. The attenuator at the output is to prevent damage to the spectrum analyzer, and should be sized
accordingly to handle the power.
It is important not to exceed the rated supply current and output power. When testing the device at higher than nominal supply
voltage, the V_APC should be adjusted to avoid the output power exceeding +36dBm. During load-pull testing at the output it is
important to monitor the forward power through a directional coupler. The forward power should not exceed +36dBm, and
V_APC needs to be adjusted accordingly. This simulates the behavior for the power control loop. To avoid damage, it is recom-
mended to set the power supply to limit the current during the burst not to exceed the maximum current rating.
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Rev A4 DS071026