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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.23. Front End Module control
3.23.1. Front End Module control : RF block 1 (SG3)
Implemented in the S-Gold3 are two outputs which are FE1, FE2 for direct control of front end
modules(FL400) with two logic input pins to select RX and TX mode as well as low and high band
operation. FEM need 2V85_VRF supply.

< Fig 37. FEM Circuit Diagram >
L
L
H
X
T
_0
091 / 0081 MSG
LL
)2
EF(
2
C
V
H
X
T_
009 / 058MSG
L
)
1
E
F(
1
C
V
L
XR_
00
9
/
0
5
8
MS
G
XR
_0
091 / 0081 MSG
0
0
4R
mh
o
0
0
1
1Y
2
Y
004UX
6
P
6
1
VW
7C
N
1A
2A
D
N
G
CC
V
2
GSM850_900TX
13
3
GSM900RX1 GSM900RX2
4
19
NC1
20
NC2
VC1
16 10
VC2
00
4
LF
2
8
7
-A
N
3
4
PS
ML
T
N
A
7
1
9
GND1
12
GND2 GND3
14 15
GND4 GND5
18
5
GSM1800RX1 GSM1800RX2
6
11
GSM1800_1900TX GSM1900RX1
7 8
GSM1900RX2
1
GSM850RX1 GSM850RX2
p
0
0
1
204C
1
0
4R
mho0
0
1
FRV_
5
8
V
2
00
4
C
p0001
104C
p001
1
E
F
2EF