Only For Training And Service Purposes - LG GM200 Service Manual

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III-2. RF circuits technical brief
AD6725
`
AFCDAC
32.768kHz
Crystal
A N T 5 0 1 A N T 5 0 2
A N T 5 0 3
R 5 0 1
D I N
L 5 0 2 1 8 n H
S W 5 0 1
G R S 3 0 2 2 - - S H 2 2 E - 3 0 0 0
E N W Y 0 0 0 6 3 0 1
C 5 2 1 2 2 p
1
L
M o d e P A B A N D T X _ E N B S 1 B S 2
S a t n d b y 0 X X X
LGE Internal Use Only
R X 1 1 0 0 0
R X 2 1 0 0 1
R X 3 1 0 1 1
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

PA_EN
TX_RAMP
PA_BAND
ANT_SW2
ANT_SW1
TRANSCEIVER
AD6548
PFD
IP
IN
/4
QP
QN
DC Offset
Correction
DC Offset
Correction
AFC
VAFC
Xtal Osc Frac-N
+ Tuning Synth
26MHz
Crystal
26MHz
LDO LDO LDO
Reg 1 Reg 2 Reg 3
2V75_VCXO
S_DATA
S_CLK
S_EN
V B A T
C 5 1 0
C 5 1 1 C 5 1 2
0 0 . 1 u
3 9 p 4 7 u
R 5 0 4 5 1
R 5 0 5 5 6
2 4 2
G N D 1 4 V L O G C I
2 3 3 R 5 0 7 1 K
G N D 1 3 V R A M P
2 2 4
G N D 1 2 T X _ E N
2 1 5
U 5 0 2
G N D 1 1 B S 1
2 0 6
G N D 1 0 B S 2
1 9 7
G N D 9 G N D 2
S M R H 0 0 0 5 2 0 1
1 8 8
G N D 8 G N D 3
1 7 9
A N T G N D 4
S K Y 7 7 5 3 1
8 n H
5 0 3
F
L 5 0 8 2 7 . n H 4
N I
L 5 0 9 1 2 . n H 1
N I
2
G
3
G
S F
F
L 5 1 0 1 5 . n H 4
N I
L 5 1 1 3 3 . n H 1
N I
2
G
3
G
S F
Figure 3-13-1 GM200 RF circuits
PAM
/2
RX1900_N
Match
RX1900_P
RX1800_N
Match RX1800_P
RX900_N
RX900_P
Match
RX850_N
Match RX850_P
RX LO
Generator
TX LO
Generator
PAM CONTROL LOGIC
Serial
Mode
Interface
STANDBY
GSM850
EGSM
DCS1800
PCS1900
GSM850/EGSM TX
DCS1800/PCS1900 TX
R 5 0 2 1 0 K
A F C
C 5 0 8
0 1 . u
4 7 p
C 5 1 3
2 2 p
C 5 1 5
X 5 0 1
3 4
D S X 3 2 1 G 2 - 6 M
2 1
E X X Y 0 0 2 5 2 0 1
Q N
2 6 M H z
C
R 5 0 6 1 0 0 o h m
3
P A _ B A N D ( G I P O _ 0 7 ) 0
T X _ R A M P Q P
R 5 0 8 1 0 0 o h m
P A _ E N ( G I P O _ 0 6 ) 0
R 5 0 9 1 0 0 o h m
A N T _ S W 1 ( G I P O _ 0 6 ) 6
R 5 1 0 1 0 0 o h m
A N T _ S W 2 ( G I P O _ 0 6 ) 5
L 5 0 1 S A W E N 1 G 8 4 C N 0 F 0 0
7
_ 1 8 4 2 _ 5 O U T _ 1 8 4 2 _ 5 _ 1
6
O U T _ 1 8 4 2 _ 5 _ 2
9
O U T _ 1 9 6 0 _ 1
8
_ 1 9 6 0 O U T _ 1 9 6 0 _ 2
5
N D 1 G N D 3
1 0
N D 2 G N D 4
S B 0 0 0 1 9 0 2
L 5 0 2 S A W E N 8 8 1 M C N 0 F 0 0
7
_ 8 8 1 _ 5 O U T _ 8 8 1 _ 5 _ 1
6
O U T _ 8 8 1 _ 5 _ 2
9
O U T _ 9 4 2 _ 5 _ 1
8
_ 9 4 2 _ 5 O U T _ 9 4 2 _ 5 _ 2
5
N D 1 G N D 3
1 0
N D 2 G N D 4
S B 0 0 0 1 8 0 2
- 57 -
3. TECHNICAL BRIEF
PA_Band PA_EN ANT_SW1 ANT_SW2
0
X X X
1
0 0 0
1
0 0 1
1
0 1 1
1
0 1 0
1
1 0 X
1
1 1 X
2 V 7 5 _ V C X O
C 5 0 7
C 5 0 5 C 5 0 6
0 1 . u
0 1 . u 2 7 p
C 5 0 9
2 2 0 n
V L D O 1
C 5 1 4
1 u
V C C _ R E F N C
1 7 8
V A F C _ N C S E N
1 8 7
R E F N I B S C L K
U 5 0 1
1 9 6
R E F N I S D A T A
2 0 5
E U S Y 0 2 8 0 1 0 1
R E F _ O P V C C _ B I B
2 1 4
Q B B I N I
2 2 A D 6 5 4 8 3
5 1 6 Q I C 5 1 7
2 3 2
9 p
V C C _ B B Q V C C _ F E 3 9 p
2 4 1
P I
V L D O 1
R 5 1 1
4 7 p
ANTENNA
RF500
MOBILE S/W
C 5 0 1 1 0 0 0 p
2 6 M _ B T
2 6 M
V L D O 1 V B A T 2 V 9 3 _ V E X T
C 5 0 2 C 5 0 3 C 5 0 4
0 1 . u 0 1 . u 0 1 . u
S _ E N ( G I P O _ 0 7 ) 2
S _ C L K ( G I P O _ 0 7 ) 3
S _ D A T A ( G I P O _ 0 7 ) 4
C 5 1 8 C 5 1 9 C 5 2 0
1 0 0 p 1 0 0 p 1 0 0 p
LGE Internal Use Only