REV. 0

AD8345

–13–

IEEE

HP34970A

D1

D2

D3

34901

34907

34907

D1

D2

D3

INTERFACE

BOARD

I_IN

Q_IN

OUTPUT_1

OUTPUT_2

ARB FUNCTION GEN

IEEE

TEKAFG2020

VPS1

VN

GND

VP

+15V MAX

COM

+25V MAX

–25V MAX

HP3631

IEEE

AD8345

CHARACTERIZATION

BOARD

P1

IN

IP

QP

QN

ENBL

VOUT

P1

IN

IP

QP QN

RFOUT

IEEE

HP8648C

LO

IEEE

PC CONTROLLER

SPECTRUM

ANALYZER

RF I/P

SWEEP OUT

IEEE

28V

HP8593E

Figure 11. Characterization Board SSB Test Setup

CHARACTERIZATION SETUPS

SSB Setup

Essentially, two primary setups were used to characterize the

AD8345. These setups are shown in Figures 11 and 13. Figure

11 shows the setup used to evaluate the product as a Single

Sideband modulator. The interface board converts the single-

ended I and Q inputs from the arbitrary function generator to

differential inputs with a dc bias of approximately 0.7 V. The

interface board also provides 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 AD8345 characterization board. Two HP34907

plug-ins were used to provide additional miscellaneous dc and

control signals to the interface board. The LO input was driven

directly by an RF signal generator and the output was measured

directly 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 12.

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

–100

CENTER = 900MHz

SPAN = 1MHz

Figure 12. Typical SSB Output Spectrum

Modulated Waveform Setup

For evaluating the AD8345 with modulated waveforms, the

setup shown in Figure 13 was used. A Rohde & Schwarz

AMIQ signal generator with differential outputs was used to

generate the baseband signals. For all measurements the input

level on each baseband input pin was 0.7 V

± 0.3 V peak. The

output was measured with a Rohde & Schwarz FSIQ spec-

trum/vector analyzer.

+15V MAX

COM

+25V MAX

–25V MAX

HP3631

IEEE

AD8345

CHARACTERIZATION

BOARD

P1

IN

IP

QP

QN

ENBL

VOUT

LO

RFOUT

IEEE

HP8648C

IEEE

PC CONTROLLER

SPECTRUM

ANALYZER

RF I/P

IEEE

FSIQ

PC CONTROL

AMIQ

IN

IP

QP

QN

Figure 13. Test Setup for Evaluating AD8345 with Modulated

Waveforms