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725 Edge
W220 GSM/GPRS Level 3 Circuit Descriptions




W220 GSM/GPRS




Level 3
Circuit Description
2006/03/27
V1.0


Motorola Proprietary Information/
725 Edge
W220 GSM/GPRS Level 3 Circuit Descriptions

Index
1 Receive ................................................................................................................................. 4

1.1 Band selection............................................................................................................... 4
1.2 Frontend........................................................................................................................ 6
1.3 Demodulation................................................................................................................ 6
1.4 Audio............................................................................................................................. 7
1.5 26MHz System Clock .................................................................................................. 10

2 TRANSMIT....................................................................................................................... 10

2.1 Audio........................................................................................................................... 10
2.2 Modulation.................................................................................................................. 12
2.3 TX VCO....................................................................................................................... 13
2.4 TX PA.......................................................................................................................... 14
2.5 TX PA Power Control ................................................................................................. 14

3 Baseband Processsor ........................................................................................................ 16

3.1 Main Baseband Digital Processor - U201 (CalypsoLite) .......................................... 16
3.2 Baseband Analogue Coprocessor