AD8346 datasheet(17/20 Pages) AD

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AD8346

Rev. A | Page 17 of 20

CDMA SETUP

For evaluating the AD8346 with CDMA waveforms, the setup

shown in Figure 35 was used. This is essentially the same setup

as that used for the single sideband characterization, except that

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 36 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

measurements, the I/Q input signals used were generated with

only the pilot channel (Walsh Code 00) active. The I/Q SIM

software was set for 32× oversampling using a CDMA equifilter.

VPS1

GND

AD8346

MOTHERBOARD

I IN

Q IN

IEEE

34901

34907 34907

HP34970A

AD8346

EVAL BOARD

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 35. 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 36. Typical CDMA Output Spectrum

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