RF3321 datasheet(14/16 Pages) RFMD

14 / 16 page

Preliminary

2-14

RF3321

Rev A10 010516

Hardware Setup

Gain and Harmonic Distortion Test Setup

To test the gain of the RF3321 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 0.2dB 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 J6: 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 3.5dB 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 +5.0 VDC into V+ and ground into GND(JP1).

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

generator. Set the GCW to 56 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 56 to 0 (in steps of one), there will be a 1dB

change in the output of the PCB.

CLK Line

5SHUTDOWN Line

3Data Line

TX Enable Line

25 Pin D-Connector (Back View)

RF3321 PCBA Cable

2CS Line

Ground

Figure 3. Cable Configuration

Figure 4. On-Screen Display

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