RF3322PCBA datasheet(12/14 Pages) RFMD

12 / 14 page

Preliminary

3-38

RF3322

Rev A2 010518

Hardware Setup

Gain and Harmonic Distortion Test Setup

To test the gain of the RF3322 PCBA, connect a low-

pass or band-pass filter to the output of the signal gen-

erator. Use a filter just above the frequency you want to

test. The filter is used to attenuate any harmonics out-

put by the signal generator. Connect the signal genera-

tor to the power meter and measure the power.

Compare with modulation enabled and disabled to

make sure the meter was measuring average rather

than peak power. No more than 0.2 dB difference in

power should be observed. An offset on the signal gen-

erator may be needed to match the level shown on the

power meter. The signal generator should then be con-

nected directly to a spectrum analyzer. Make sure the

output of the signal generator is the same as the input

read by the spectrum analyzer. Adjust the offset of the

spectrum analyzer until the signal out is the same as

the signal in on the spectrum analyzer. Turn off the RF

and modulation. Check positioning of the jumpers on

the board. Refer to the PCBA section of this applica-

tion note to verify proper positions. Connect the output

of the signal generator to J2: RFIN of the PCB. Con-

nect J7: RFOUT to the spectrum analyzer. Ensure that

you are accounting correctly for the losses in the 75

Ω

to 50

Ω conversion at the output of the device; there is

an output voltage loss of 3.5 dB for the evaluation

board in its standard configuration (see output stage

circuit description). Connect one end of the serial cable

into the computer and the other end into J1 of the PCB.

Connect +5.0VDC into V+ and ground into GND(JP1).

Turn on the DC power and turn on RF from the signal

generator. Set the GCW to 58 and make sure TX

Enable is checked. The amplified signal should be dis-

played on the spectrum analyzer. The harmonics can

also be viewed with this setup. As you change the

GCW from 58 to 0 (in steps of one), there will be a 1 dB

change in the output of the PCB.

ACPR Test Setup

To test the ACPR of the RF3322 PCBA set modulation

to:

•QPSK

•

2Bits/Sym

•

160 ksps

•

α=0.25

•

PRBS-20bit Data

CLK Line

5SHUTDOWN Line

3Data Line

TX Enable Line

25 Pin D-Connector (Back View)

RF3322 PCBA Cable

2CS Line

Ground

Figure 3. Cable Configuration

Figure 4. On-Screen Display

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