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TRF3705
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SLWS223A – AUGUST 2011 – REVISED OCTOBER 2011
WCDMA
The adjacent channel power ratio (ACPR) performance using a single-carrier WCDMA signal in the UMTS band
is shown in Figure 72 .
Figure 72. Single-Carrier WCDMA ACPR, IF = 30 MHz, LO Frequency = 2110 MHz
A marginal improvement in OIP3 and output noise performance can be observed by increasing the LO drive
power, resulting in slightly improved ACPR performance. The ACPR performance versus LO drive level is plotted
in Figure 73 across common frequencies to illustrate the amount of improvement that is possible.
?75
V CM = 0.25 V
V CC = 3.3 V
748 MHz
942.5 MHz
?76
LO = 0 dBm
GC = Off
1960 MHz
2140 MHz
2600 MHz
?77
?78
?79
?80
?81
?5
0
5
10
15
Frequency (MHz)
G071
Figure 73. Single-Carrier WCDMA ACPR Performance vs LO Power
Copyright ? 2011, Texas Instruments Incorporated
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