4.16.3 Checking PAM Block
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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
GSM_TX
DCS_PCS_TX
2
G2
3
FL101
EFCH897MTDB1
G1
GSM_PA_BAND
GSM_PA_RAMP
C142
1000p
8 dB
10 dB
GSM_PA_EN
R106
R108
C134
120
R113
C141
R111
51
tcc_16085h_9_r
C127
22u
PGND5
PGND6
22
PGND7
23
24
PGND8
25
PGND9
4
RSVD1
8
RSVD2
12
RSVD3
TX_EN
1
6
VAPC
VBATT
5
GSM_OUT
17
PGND1
PGND10
26
PGND11
27
PGND12
28
29
PGND13
30
PGND14
PGND15
31
32
PGND16
33
PGND17
PGND18
34
PGND19
35
18
PGND2
36
PGND20
PGND3
19
PGND4
20
21
SKY77329
U101
BS
3
DCS_PCS_IN
2
16
DCS_PCS_OUT
GND1
10
GND2
11
13
GND3
GND4
14
15
GND5
7
GSM_IN
9
R107
91
91
120
R112
G3
5
IN
1
O1
4
+VPWR
68
68p
2.2K R105
C132
100p
1000p
[Fig. 4.15] Schematic of PAM Block
[Fig. 4.15] Schematic of PAM Block
Test Point
Net name
Description
TP1
GSM_PA_RAMP
Power Amp Gain Control. Typically, 0.2 ~1.6V
TP2
GSM_PA_EN
Power Amp Enable (ON : >2.5V, OFF : <0.7V)
TP3
+VPWR
PAM Supply Voltage (Vcc > 3V)
TP3
TP2
TP1
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