Receiver; Introduction To Receiver Functionality; Wcdma Receiver - Nokia RM-132 Service Manual & Parts Manual

RM-132; RM-133
Nokia Customer Care System Module
Figure 98 RF frequency plan

Receiver

Introduction to receiver functionality

The receiver is a linear direct conversion receiver containing LNA, band pass filter and demodulator for each
supported system and band. After the demodulators the signal paths are combined to one common BB path.

WCDMA receiver

In the WCDMA mode, the received signal is fed from the antenna to the single feed switch, which routes the
received WCDMA signal to the SAW duplex filter. From the duplex filter, the signal goes through a balun to
the integrated LNA in the RF ASIC. From the LNA, the signal goes through a band pass filter. After filtering,
the signal goes to the down conversion mixer, which converts the signal into baseband I and Q signals.
At BB frequency the signal is amplified and fed to a low pass filters.
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