5-6
RF2484
Rev A7 061115
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 sig-
nals. 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 equifilters. 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
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