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.
RM-132; RM-133
Nokia Customer Care
System Module
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COMPANY CONFIDENTIAL
Issue 1
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