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4. TROUBLE SHOOTING
4.6.4 Checking PAM Block
PAM Control Signal
TP1. GSM_PA_RAMP : Power Amp Gain Control. typically, 0.5V < Vapc <
2.6V,
TP2. GSM_PA_EN : Power Amp Enable
(Power ON : higher than 2.5V , Power OFF : lower than 0.7V)
TP3. +VPWR : PAM Supply Voltage Vcc higher than 3.28V
C530
C531
33p
33p
L522
18nH
L524
1.5nH
GND6
GND5
12
VCC
GND4
GND3
9
GSM_OUT
GND2
LGE Internal Use Only
1
DCS_PCS_IN
2
BS
GSM_PA_BAND
3
U501
TX_EN
GSM_PA_EN
TQM7M5003
4
VBATT
5
GND1
6
VRAMP
7
GSM_IN
15
- 108 -
TP1
R506
2.2K
C536
(1%)
68p
TP3
C544
C543
100p
22u
R516
TP2
R522
270
Copyright © 2007 LG Electronics. Inc. All right reserved.
GSM_PA_RAMP
R513
VBATT
0
15
R518
15
R523
R520
R521
270
220
220
R524
51
Only for training and service purposes
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