Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
© 2003 All rights reserved
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autorisation préalable.
1.5.2 RF architecture
The RF part of WISMO Quik Q2501 have separate RF front-ends for GSM/GPRS
and GPS.
1.5.2.1 GSM RF architecture
SAW
FILTERS
GSM RF
Transceiver
VC-TCXO 26 MHz
LNA
LOW IF
CONVERTER
ADC
DIGITAL
FILTERS
DAC
LOW TO RF FREQUENCY CONVERTER
OFFSET PLL TRANSMITTER
RECEIVER PART
TRANSMITTER PART
POWER
AMPLIFIERS
+ CONTROLLERS
DUAL RF
SWITCHES
Antenna Control
module
GSM
Baseband
Unit
Figure 2: GSM/DCS RF front-end
The GSM/DCS Radio Frequency part is based on two specific dual band chips
including:
GSM Transceiver:
• Low-IF Receiver,
• Dual RF (Radio Frequency) synthesizer,
• Digital IF to Baseband Converter,
• Offset PLL (Phase Lock Loop) transmitter.
Power Amplifier:
• Dual band Power Amplifier with controller and integrated antenna switch.