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2mm
VBAT
C1043
C1044
TP1
22u
47p
R107
GSM_PA_RAMP
2.2K
Module Control and Antenna Switch Logic
ANT_SEL 3
ANT_SEL 2
0
0
0
0
0
1
1
LGE Internal Use Only
ANT_SEL2
ANT_SEL1
ANT_SEL0
ANT_SEL3
C1024
39p
GSM_TX
GSM850(824-849MHz)
GSM900(880-915MHz)
DCS_PCS_TX
DCS(1710-1785 MHz)
PCS(1850-1910 MHz)
Schematic of the Antenna Switch Block
ANT_SEL 1
0
0
1
0
0
1
0
1
0
0
0
1
0
1
GND
7
VBATT
18
GPCTRL2
17
GPCTRL1
19
GPCTRL0
U101
20
TX_EN
21
VRAMP
22
PGND1
23
PGND2
24
GND2
8
C1091
C1092
56p
22p
R116
75
11dB
R113
47
7dB
ANT_SEL 0
0
0
0
1
1
0
1
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Copyright © 01 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
WCDMA_850_RTX
TRX2
13
TRX1
WCDMA_2100_RTX
12
RX2
11
RX1
10
GND7
16
GND4
6
GND3
9
GND8
2
GND1
1
Tx Module Mode
Standby
Rx1
Rx
TRX1
TRX
Low Band GMSK
High Band GMSK
Only for training and service purposes
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Table of Contents
Troubleshooting
