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3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics
60/136
LGE Property
3.20. Front End Module control
Implemented in the S-Gold3 (FL500) are two outputs which are VC1, VC2 for direct control of front end modules
with two logic input pins to select RX and TX mode as well as low and high band operation..
Table 8 FEM Control Logic
Figure 27 FEM schematic
22p
C524
22p
R501
KMS-518_P
SW500
G1
A
C
G2
100n
L501
0.5p
C510
C539
DNI
100
R502
100
R504
C503
47p
C508
47p
ANT500
DNI
C519
LMSP43NA-782
FL500
0
2
9
1
3
1
1
1
8
1
5
1
8
4
1
7
2
1
6
9
5
4
0
1
3
6
1
2
1
17
ANT
1
X
R0
58
M
S
G
2
X
R0
58
M
S
G
1
C
V
1
X
R0
09
M
S
G
2
C
V
2
X
R0
09
M
S
G
1
X
R0
08
1
M
S
G
1
D
N
G
2
X
R0
08
1
M
S
G
2
D
N
G
1
X
R0
09
1
M
S
G
3
D
N
G
2
X
R0
09
1
M
S
G
4
D
N
G
5
D
N
G
XT
00
91
_0
08
1
M
S
G
XT
00
9_
05
8
M
S
G
1
C
N
2
C
N
0
R510
VC1
VC2
L
L
GSM 1800 / 1900_ RX
GSM850 / 900_RX
VC2 (FE2)
H
H
L
GSM850 / 900_TX
L
L
L
GSM 1800 / 1900_ TX
VC1 (FE1)
CI:$0.05(CMOS->PIN)
GS290 Operational Description Revision B
LG Electronics
60/136
LGE Property
3.20. Front End Module control
Implemented in the S-Gold3 (FL500) are two outputs which are VC1, VC2 for direct control of front end modules
with two logic input pins to select RX and TX mode as well as low and high band operation..
Table 8 FEM Control Logic
Figure 27 FEM schematic