Preliminary
5-34
RF2484
Rev A2 010829
5
CDMA/W-CDMA Test Setup
General
The above setup was used to evaluate the RF2484
under CDMA and W-CDMA modulation conditions.
Due to test equipment limitations, a DC-level shifting
board was required to provide the appropriate DC ref-
erence voltage (4.1 V) 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 adja-
cent channel power, W-CDMA baseband signals were
filtered using a high order low pass filter before appli-
cation 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 Agi-
lent 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, rela-
tive signal amplitude levels were adjusted to optimize
signal quality.
CDMA Modulation Setup (Cellular and PCS)
To measure ACPR, I and Q input signals were gener-
ated 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 DC Level Shift
Control Board
RF2484
Evaluation Board
Rohde & Schwarz
FSIQ 1119.6001.26
Hewlett-Packard
8665B
ISIG
RF OUT
LO IN
I REF
QSIG
QREF
Agilent 66332A
VCC
VPD
Hewlett-Packard
6624A
Agilent 89441
Vector Signal Analyzer
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