User Guide

NMM-3 Company Confidential
7 - System Module & UI CCS Technical Documentation
Page 7-34 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
GSM functional descriptions
RF block diagram
The figure below shows the block diagram of the dual band GSM900/1800 section of the
transceiver. It is based around the HELGO RFIC which is a direct conversion modulator/
demodulator. The main off chip ICs shown are power amplifier module, antenna switch,
TX /RX VCO-module TX SAW filter and VCTCXO.
Figure 3: GSM RF block diagram
HELGO