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TRF3702
www.ti.com
SLWS149A – SEPTEMBER 2004 – REVISED AUGUST 2006
APPLICATION INFORMATION (continued)
GMSK SPECTRAL PERFORMANCE
vs
CHANNEL POWER
90
80
600-kHz Offset
70
400-kHz Offset
60
50
40
30
20
10
f LO = 2 GHz
0
?14
?12
?10
?8
?6
?4
?2
0
Channel Power ? dBm
G047
Figure 71.
WCDMA Applications
The TRF3702 is also optimized for WCDMA applications, where both adjacent-channel power ratio (ACPR) and
noise density are critically important. Figure 62 shows the noise performance of the modulator at a 60-MHz
offset over temperature. In addition, Figure 72 shows the 60-MHz offset noise measured at the output of the
TRF3702 versus WCDMA channel power. Using Texas Instruments' DAC568x series of high-performance
digital-to-analog converters in the configuration depicted in Figure 70 , state-of-the-art levels of ACPR have been
measured. In each case, test model 1 was used with 64 active channels as the baseband input to the TRF3702.
Figure 73 shows the performance attained for a single WCDMA carrier at 2.14 GHz, with a measured ACPR of
71.2 dBc for a channel power of –14 dBm. This unprecedented level of ACPR along with the low levels of noise
at 60-MHz offset makes the TRF3702 an optimum choice for such applications. Figure 74 shows the
single-carrier WCDMA ACPR performance versus channel power; it is important to note that even at high output
power levels, the TRF3702 maintains great linearity, offering 64 dBc of ACPR at an output-channel power of –8
dBm.
30
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