RF5111PCBA-41X RFMD [RF Micro Devices], RF5111PCBA-41X Datasheet - Page 12

• Manufacturer Part Number: RF5111PCBA-41X
• Description: 3V DCS POWER AMPLIFIER
• Manufacturer: RFMD [RF Micro Devices]

Notes about testing the RF5111
The test setup shown above includes two attenuators. The 3dB pad at the input is to minimize the effects that the switch-
ing of the input impedance of the PA has on the signal generator. When V
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 ana-
lyzer, and should be able 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
the output it is important to monitor the forward power through a directional coupler. The forward power should not
exceed +36dBm, and V
this respect. To avoid damage, it is recommended to set the power supply to limiting the current during the burst, not to
exceed the maximum current rating.
2-12
RF5111
RF Generator
Generator
Pulse
APC
APC
should be adjusted to avoid the output power exceeding +36dBm. During load-pull testing at
needs to be adjusted accordingly. This simulates the behavior for the power control loop in
3dB
x1 OpAmp
Buffer
Typical Test Setup
A buffer amplifier is recommended because the current into the
V
monitored with an oscilloscope.
APC
changes with voltage. As an alternative, the voltage may be
Power Supply
V- S- S+ V+
APC
10dB/5W
is switched quickly, the resulting input
Spectrum
Analyzer
Rev A1 060921