RF5110PCBA datasheet(11/14 Pages) RFMD

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RF5110

Rev A0 DS050318

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Typical Test Setup

Notes about testing the RF5110

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 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 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 +36 dBm. 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

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.

Power Supply

10dB/5W

3dB

RF Generator

Spectrum

Analyzer

Buffer

x1 OpAmp

Pulse

Generator

A buffer amplifier is recommended because the current into the VAPC

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

monitored with an oscilloscope.

V+

V-

S-

S+

RF5110PCBA Datasheet(PDF) 11 Page - RF Micro Devices