rf5111 RF Micro Devices, rf5111 Datasheet - Page 12

• Manufacturer Part Number: rf5111
• Description: 3v Dcs Power Amplifier Rf5111
• Manufacturer: RF Micro Devices

RF5111
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 switching of
the input impedance of the PA has on the signal generator. When V
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 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
important to monitor the forward power through a directional coupler. The forward power should not exceed +36dBm, and
V
it is recommended to set the power supply to limiting the current during the burst, not to exceed the maximum current rating.
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APC
needs to be adjusted accordingly. This simulates the behavior for the power control loop in this respect. To avoid damage,
RF Generator
APC
Generator
should be adjusted to avoid the output power exceeding +36dBm. During load-pull testing at the output it is
Pulse
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3dB
x1 OpAmp
Buffer
A buffer amplifier is recommended because the current into the
V
monitored with an oscilloscope.
APC
Typical Test Setup
changes with voltage. As an alternative, the voltage may be
Power Supply
V- S- S+ V+
APC
is switched quickly, the resulting input impedance
10dB/5W
Spectrum
Analyzer
Rev A1 DS060921