Combinations of these channels
will increase the peak to average
power ratio for higher data rates.
The complementary cumulative
distribution function (CCDF)
measurement characterizes the
peak to average power statistics
of CDMA2000 reverse link. For
reference, the system specifica-
tions of peak to average power
ratio of IS-95 and CDMA2000 IX
RTT are 3.9 dB and 5.4 dB at
1% CCDF respectively.
The test results below for the
ACPM-7833 show the compliance
to the system linearity specifica-
tions with 4 channel configura-
tions, representing a broad cross-
section of CDMA2000 1X RTT
environments.
Higher peak to average power
ratio requires a higher margin,
both in higher power gain and in
improved thermal stability for PA
linearity to meet the minimum
system specifications.
Test result of ACPM-7833 using CDMA2000 1X RTT signal
Test condition - PA Evaluation board with Vdd1=Vdd2=Vbias = 3.4V, Vcntl = 2.5V, Frequency = 1880 MHz. Test result with each channel configuration.
1.25 MHz
ACPR(dBc)
1.25 MHz
ACPR(dBc)
-1.98 MHz
ACPR(dBc)
+1.98 MHz
ACPR(dBc)
Channel
IVdd(mA)
Pin(dBm)
Pout(dBm)
Basic
451.0
435.0
439.0
299.0
-0.14
0.52
0.50
-2.56
-52.6
-46.2
-45.5
-49.1
-51.5
-45.7
-44.9
-48.8
-60.2
-58.0
-60.1
-57.7
-60
28
Voice+Data
Voice+Cntl
Cntl only
-58.3
-60
28
28
-57.5
25.5
EIA/TIA-98-D indicates a 2.5 dB allowed back off in power for control channel only configuration.
Peak to average power ration (Pout = 16 dBm)
CCDF(%)
Basic
Voice + Data
Voice + CNTL
CNTL only
10
2.11
3.74
4.68
5.15
5.36
5.48
3.37
4.83
5.68
6.20
6.53
6.63
3.44
5.21
6.24
6.76
7.11
7.17
4.00
5.75
6.73
7.18
7.39
7.45
1
0.1
0.01
0.001
0.0001
10
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