LG GW520 - GSM Power Amplifi er Module

- 65 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. RF Circuit Technical Brief
GW520 service manual
4.4 GSM Power Amplifier Module
[Figure 4.4-1] Schematic Diagram of 2.5G PAM (TQM7M5005)
[Table 4.4-1] SKY77340 Pin description
coil
10K
R512
3.3nHL510
VBAT
C553
3.3p
47p
C549
47p
C558
7
GSM850_900_IN
10
GSM850_900_OUT
2
MODE_SELECT
PGND
15
TX_EN
6
4
VBATT
5
VRAMP
TQM7M5005
SMPY0017901
U502
BS
313
BY_CAP1
BY_CAP2
9
1
DCS_PCS_IN
12
DCS_PCS_OUT
14
GND1
GND2
11
GND3
8
C554
DNI
C555
1.8p
0.01u
C557
C552
12nH
33u
C542
L509
18nH
C556
0.01u
C548
18p
LBAND_IN
2G_BS
TXON_PA
PA_MODE
PA_LEVEL
HBAND_IN