Receiver Part Description - LG L1150 Service Manual

4.17. Receiver Part Description

Rx Frequency
GSM850 : 869 ~ 894 MHz
GSM1800 : 1805 ~ 1880 MHz
GSM1900 : 1930 ~ 1990 MHz
GSM
LNA
DCS
LNA
PCS
LNA
VC_GSM_RX_TX
VC_GSM850_TX
Ant Switch (LMSP7CHA-216)
• Select the Path
– GSM / DCS / PCS Tx
– GSM / DCS / PCS Rx
ANT
ANT SW
Functional Block Diagram
0/90 < SI4205_BM >
Xin
RF PLL
RF1
GSM850 : 1737.8 ~ 1787.8 MHz
GSM1800 : 1804.9 ~ 1879.9 MHz
GSM1900 : 1929.9 ~ 1989.9 MHz
VC_GSM1800/1900_TX
4. TROUBLE SHOOTING
ADC
PGA
ADC
PGA
100kHz
Triple Buffer
GSM Rx Path
GSM850 Rx Path
DCS Rx Path
PCS Rx Path
- 85 -
DAC
PGA
DAC
PGA
Xout
VC_TCXO
26MHz
VC1
VC2
VC3
I
Q