User's Manual

FCC Documentation
MM-5500SU CDMA 1X/EVDO Modem
23/23
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The transmitter IF VCO is set to 267.2 MHz by an external varactor-tuned resonant tank circuit. An
internal phase-lock loop and external loop filter network provides the feedback to the varactor that
tune the VCO precisely to 267.2 MHz. A master-slave divide-by-two circuit generates I and Q signals
in precise quadrature for the mixers.
MSM5500
S1M8656A
Figure 12. S1M8656A and RFT3100 functional block diagram