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Only For Training And Service Purposes - LG GM310 Service Manual

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4. RF Circuit Technical Brief
A
N
T
A
N
T
A
N
T
A
N
T
GM310
[Figure 4.2.5-2]
VC1
850/900 TX
850/900 TX
1
1
1800/1900 TX
1800/1900 TX
1
1
850 RX
850 RX
0
0
900 RX
900 RX
0
0
1800 RX
1800 RX
0
0
1900 RX
1900 RX
0
0
WCDMA 900
WCDMA 900
0
0
WCDMA 1900
WCDMA 1900
0
0
WCDMA 2100
WCDMA 2100
0
0
LGE Internal Use Only
2
V
8
5
_
V
R
F
C
1
0
4
0
C
1
0
4
1
1
0
0
0
p
0
1 .
u
_
S
E
L
2
_
S
E
L
6
U
1
0
0
5
N
L
2
7
W
Z
3
2
U
S
G
1
8
A
1
V
C
C
_
S
E
L
1
2
7
B
1
Y
1
_
S
E
L
4
3
6
Y
2
B
2
4
5
G
N
D
A
2
GM310
[Figure 4.2.5-1]
A
N
T
_
S
L
C
D
_
B
L
_
C
T
R
L
_
E
O
C
M
M
C
_
D
E
T
E
C
T
P
A
_
M
A
N
T
_
S
A
N
T
_
S
D
S
R
G
P
O I
1 [
G
P
O I
1 [
G
P
O I
1 [
G
P
O I
1 [
Front End Control (Control signal from Baseband IC)
VC2
VC2
VC3
VC3
VC4
VC4
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
1
GM310
[Figure 4.2.5-3]
GM310f service manual
F
L
1
0
0
1
D
5
0
1
7
P
C
S
P
C
S
2
A
N
T
P
C
N
P
C
N
1
G
N
D
1
E
G
S
M
8
G
N
D
2
E
G
S
M
1
0
G
N
D
3
2
3
G
N
D
4
G
S
M
8
5
0
2
4
G
N
D
5
G
S
M
8
5
0
W
C
D
M
A
_
W
C
D
M
A
W
C
D
M
A
_
P
C
N
_
P
C
G
S
M
8
5
0
_
E
G
S
M
R
1
0
1
0
1
K
R
1
0
1
1
1
K
R
1
0
1
2
1
K
R
1
0
1
3
1
K
2
V
8
5
_
V
R
F
C
1
0
5
3
1
u
G
S
M
_
P
A
O
U
T
_
A
N
T
_
S
E
L
3
A
N
T
_
S
E
L
5
G
S
M
_
P
A
O
U
T
_
Front End Control (FEM input)
T
_
O
U
T
1
V
9
T
_
O
U
T
2
E
L
1
A
A
8
T
_
O
U
T
3
W
9
T
_
O
U
T
4
V
8
T
_
O
U
T
5
A
B
3
T
_
O
U
T
6
O
D
E
A
B
4
T
_
O
U
T
7
E
L
2
W
8
T
_
O
U
T
8
E
L
3
A
C
1
T
_
O
U
T
9
A
1
0
] 6
A
N
T
_
S
E
L
4
B
1
0
] 7
A
N
T
_
S
E
L
5
A
9
] 8
A
N
T
_
S
E
L
6
A
8
] 9
ANT_SEL1
ANT_SEL2
ANT_SEL2
ANT_SEL3
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Front End Control Logic Table
- 56 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
1
8
_
R
X
1
1
9
_
R
X
2
1
6
_
R
X
1
1
7
_
R
X
2
1
4
_
R
X
1
1
5
_
R
X
2
1
2
_
R
X
1
1
3
_
R
X
2
2
0
2
1
0
0
2
1
_
8
5
0
2
2
1
9
0
0
9
S
_
T
X
G
S
M
_
P
A
O
U
T
_
H
B
1
1
_
T
X
G
S
M
_
P
A
O
U
T
_
L
B
C
1
0
5
2
1
L
B
C
1
0
5
4
D
I N
C
1
0
5
6
H
B
C
1
0
5
8
2
2
n
H
ANT_SEL4
ANT_SEL5
ANT_SEL6
ANT_SEL6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1

Only for training and service purposes

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