AD8346 データシートの表示（PDF） - Analog Devices

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AD8346

0.8 GHz to 2.5 GHz Quadrature Modulator

Analog Devices 

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.

AD8346

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.

IEEE

+15V MAX

COM

+25V MAX

–25V MAX

HP3631

IEEE HP34970A

D1

D2

D3

34901 34907 34907

D1

D2

D3

VPS1

I IN

AD8346 Q IN

VN MOTHERBOARD

GND

VP

P1 IN IP QP QN

TEKAFG2020

OUTPUT 1

OUTPUT 2

IEEE

ARB FUNC. GEN

HP8648C

IEEE

RFOUT

IP QP

IN AD8346 QN

EVAL BOARD

LO

ENBL P1

VOUT

FSEA30

RF I/P

IEEE

SPECTRUM

ANALYZER

IEEE

PC CONTROLLER

Figure 35. Evaluation Board CDMA Test Setup

–20

–30

–40

–50

–60

CH PWR = –20.7dBm

ACP UPR = –71.8dBc

–70

ACP LWR = –71.7dBc

–80

–90

–100

–110

–120

CENTER 1.9GHz

187.5kHz/

SPAN 1.875MHz

Figure 36. Typical CDMA Output Spectrum

Rev. A | Page 17 of 20

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