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RF2484

DS121024

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

CDMA/W-CDMA Test Setup

General

The above setup was used to evaluate the RF2484 under CDMA and W-CDMA modulation conditions. An AMIQ was required to

provide the appropriate DC reference voltage (4.1V) for the I and Q pins. I and Q were driven single-endedly; differential drive

may improve performance. A PC-controlled Rohde & Schwarz AMIQ generated the CDMA I and Q signals. In order to reduce

AMIQ noise contributions to adjacent channel power, W-CDMA baseband signals were filtered using a high order low pass filter

before application to the RF2484.

EVM, Phase Error, and Rho

To measure EVM, phase error, and Rho, signals were generated using the AMIQ and decoded with the Agilent VSA. For CDMA

Cellular and PCS, I and Q input signals were generated with the Pilot Channel active, 32x oversampling and base station equi-

filters. For W-CDMA, the Common Pilot Channel was active with 8x oversampling and a root cosine filter. In all cases, relative

signal amplitude levels were adjusted to optimize signal quality.

CDMA Modulation Setup (Cellular and PCS)

To measure ACPR, I and Q input signals were generated using the following settings:

•

Pilot Channel active

•

Sync Channel active

•

Paging Channel active

•

6 Traffic Channels active

•

32x Oversampling

• Base Station equifilter

W-CDMA Modulation Setup

To measure W-CDMA ACPR, I and Q input signals were generated using the following settings in the AMIQ:

•

P-CPICH (Common Pilot Channel) active

•

P-SCH (Sync Channel) active

•

P-CCPCH (Primary Common Control Physical Channel) active

•

P-ICH (Page Indicator Channel) Active

•

DL-DPCCH (Dedicated Physical Control Channel) active

•

6 DPCH (Dedicated Physical Channels) active

•8x Oversampling

Rohde & Schwarz

AMIQ 1110.2003.02

RF2484

Evaluation Board

Rohde & Schwarz

FSIQ 1119.6001.26

Hewlett-Packard

8665B

I SIG

RF OUT

LO IN

I REF

Q SIG

Q REF

Agilent 66332A

VCC

VPD

Agilent 89441

Vector Signal Analyzer