AD8346 datasheet(16/20 Pages) AD

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AD8346

Rev. A | Page 16 of 20

CHARACTERIZATION SETUPS

SSB SETUP

Two main setups were used to characterize this product. These

setups are shown in Figure 33 and Figure 35. Figure 33 shows

the setup used to evaluate the product as an SSB. The AD8346

motherboard had circuitry that converted the single-ended

I and Q inputs from the arbitrary function generator to differ-

ential inputs with a dc bias of approximately 1.2 V. In addition,

the motherboard also provided connections for power supply

routing. The HP34970A and its associated plug-in 34901 were

used to monitor power supply currents and voltages being

supplied to the AD8346 evaluation board (a full schematic of

the AD8346 evaluation board can be found in Figure 30).

The two HP34907 plug-ins were used to provide additional

miscellaneous dc and control signals to the motherboard. The

LO was driven by an RF signal generator (through the balun on

the evaluation board to present a differential LO signal to the

device) and the output was measured with a spectrum analyzer.

With the I channel driven with a sine wave and the Q channel

driven with a cosine wave, the lower sideband is the single

sideband output. The typical SSB output spectrum is shown in

Figure 34.

VPS1

GND

AD8346

MOTHERBOARD

I IN

Q IN

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34901

34907 34907

HP34970A

AD8346

EVAL BOARD

ENBL

VOUT

RFOUT

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HP8648C

+15V MAX

COM

+25V MAX

–25V MAX

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HP3631

IEEE

PC CONTROLLER

HP8593E

RF I/P

CAL OUT

28VOLT

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SPECTRUM

ANALYZER

SWEEP OUT

OUTPUT 1

OUTPUT 2

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TEKAFG2020

ARB FUNC. GEN

Figure 33. Evaluation Board SSB Test Setup

CENTER 1.9GHz

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

50kHz/

SPAN 500kHz

Figure 34. Typical SSB Output Spectrum

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