RF5110G datasheet(13/18 Pages) RFMD

13 / 18 page

2-13

RF5110G

Rev A3 060814

Typical Test Setup

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

generator as a result of switching the input impedance of the PA. When VAPC 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 ana-

lyzer, 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 VAPC 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 VAPC needs to be adjusted accordingly. This simulates the behavior for the power control loop. To

avoid damage, it is recommended to set the power supply to limit the current during the burst not to exceed the maximum

current rating.

Power Supply

10dB/5W

3dB

RF Generator

Spectrum

Analyzer

Buffer

x1 OpAmp

Pulse

Generator

A buffer amplifier is recommended because the current into the

APC changes with voltage. As an alternative, the voltage may be

monitored with an oscilloscope.

V+

V-

S-

S+

RF5110G Datasheet(PDF) 13 Page - RF Micro Devices