REV. 0

AD8346

–11–

CHARACTERIZATION SETUPS

SSB Setup

Two main setups were used to characterize this product. These

setups are shown below in Figures 27 and 29. Figure 27 shows

the setup used to evaluate the product as a Single Sideband modu-

lator. The AD8346 Motherboard had circuitry that converted

the single-ended I and Q inputs from the arbitrary function

generator to differential 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 25). The 2 HP34907 plug-ins were used to provide addi-

tional 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 below in Figure 28.

CDMA Setup

For evaluating the AD8346 with CDMA waveforms the setup

shown in Figure 29 was used. This is essentially the same as that

used for the single sideband characterization except the AFG2020

was replaced with the AWG2021 for providing the I and Q

input signals, and the spectrum analyzer used to monitor the

output was changed to an FSEA30 Rohde-Schwarz analyzer

with vector demodulation capability. The I/Q input signals for

these measurements were IS95 baseband signals generated with

Tektronix I/Q SIM software and downloaded to the AWG2021.

For measuring ACPR the I/Q input signals used were generated

with Pilot (Walsh Code 00), Sync (WC 32), Paging (WC 01),

and 6 Traffic (WC 08, 09, 10, 11, 12, 13) channels active. The

I/Q SIM software was set for 32

× oversampling and was using a

BS equifilter. Figure 30 shows the typical output spectrum for

this configuration. The ACPR was measured 885 kHz away

from the carrier frequency.

For performing EVM, Rho, phase, and amplitude balance mea-

surements the I/Q input signals used were generated with only

the Pilot Channel (Walsh Code 00) active. The I/Q SIM soft-

ware was set for 32

× oversampling and was using a CDMA

equifilter.

VPS1

VN

GND

VP

AD8346

MOTHERBOARD

I IN

Q IN

D1

D2

D3

P1

IN

IP

QP

QN

IEEE

34901

34907 34907

D1

D2

D3

HP34970A

AD8346

EVAL BOARD

P1

IN

IP

QP

QN

LO

ENBL

VOUT

RFOUT

IEEE

HP8648C

+15V MAX

COM

+25V MAX

–25V MAX

IEEE

HP3631

IEEE

PC CONTROLLER

HP8593E

RF I/P

CAL OUT

28VOLT

IEEE

SPECTRUM

ANALYZER

SWEEP OUT

OUTPUT 1

OUTPUT 2

IEEE

TEKAFG2020

ARB FUNC. GEN

Figure 27. Evaluation Board SSB Test Setup

0

CENTER 1.9GHz

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

50kHz/

SPAN 500kHz

Figure 28. Typical SSB Output Spectrum

VPS1

VN

GND

VP

AD8346

MOTHERBOARD

I IN

Q IN

D1

D2

D3

P1

IN

IP

QP

QN

IEEE

34901

34907 34907

D1

D2

D3

HP34970A

AD8346

EVAL BOARD

P1

IN

IP

QP

QN

LO

ENBL

VOUT

RFOUT

IEEE

HP8648C

+15V MAX

COM

+25V MAX

–25V MAX

IEEE

HP3631

IEEE

PC CONTROLLER

FSEA30

RF I/P

IEEE

SPECTRUM

ANALYZER

OUTPUT 1

OUTPUT 2

IEEE

TEKAFG2020

ARB FUNC. GEN

Figure 29. Evaluation Board CDMA Test Setup

–20

CENTER 1.9GHz

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

187.5kHz/

SPAN 1.875MHz

CH PWR = –20.7dBm

ACP UPR = –71.8dBc

ACP LWR = –71.7dBc

Figure 30. Typical CDMA Output Spectrum