RF2484 データシートの表示（PDF） - RF Micro Devices
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RF2484 Datasheet PDF : 10 Pages
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RF2484
CDMA/W-CDMA Test Setup
Preliminary
Rohde & Schwarz
AMIQ 1110.2003.02
RF2484 DC Level Shift
Control Board
Hewlett-Packard
6624A
Hewlett-Packard
8665B
I SIG
LO IN
I REF Q SIG
Q REF
Rohde & Schwarz
FSIQ 1119.6001.26
RF2484
5
Evaluation Board
VCC
Agilent 66332A
VPD
RF OUT
Agilent 89441
Vector Signal Analyzer
General
CDMA Modulation Setup (Cellular and PCS)
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 (4.1V) 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 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.
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
5-34
Rev A2 010829
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