LG -A120 Service Manual page 85

CIRCUIT
V100
INPAQ_Cp=0.2 pF
Cp=0.2pF
15 13
DCS_RX RSVD
16
RSVD
17
GSM_RX
18
RSVD
8
GND
7
VBATT
14
GND
19 9
20100119
GND VLOGIC
20 change
GND
21 12
GND BS
U100
22 SKY 77542-11
GND
TX-RX FEM FOR GSM/GPRS 11
TX_EN
24
GND
25
GND
10
VRAMP
26
GND
U100
150.0Ohm
U101
1842.5±37.5MMZ/942.5±17.5MHZ
FOR GSM RX,50/150 OHM-SMD10PIN
4
IN_LB
3
GND
2
GND
1
IN_HB
U101
PA to Cutkey
MATCHING
L101 R100
2.7nH 1.0nH
0402 0402
2 1 1 2
C101
L100 1.50pF
47nH 0402
0402
V101 C105
NC 15.0pF
C=160pF 0402
2 R105
0.00Ohm
C109 0402
22.0pF
0402
C110
39.0pF
0402
1
C111
39.0pF
0402
C112
220pF
0402
R110 C114
0 ohm
0402 0402
1 2
L106
C113 3.3nH
3.0pF 1 0402 2
0402 C137
4.7nH
0402
1 2
C128
C117 2.7pF
2.7pF 2 1 0402
0402
TR to PA
1 2
VBAT
R120
0.00Ohm
0402
SAW to TR
1
L108
6 18.0nH
OUT_LB1
0402
7 1
OUT_LB2
1
8
OUT_HB1
L109
9 4.70nH
OUT_HB2
0402
1
1 2
VRF
R124
0.00Ohm
0402
1 2 JRF100
C90-101-0004
For Antenna Switch
VBAT
C106 C108
100nF 22uF
0402 Cap_0805
1
VRF
BANDSW_DCS 2
R108
1.00Kohm
0402
2
PA_EN 2
R109
10.0Kohm
0402
1 2
VAPC 3
R112
20.0Kohm
0402
JRF100
TX_PDCS
C119
100nF
0402
C122
22.0pF
0402
2
32
RX850
31
RX850B
C123
22.0pF 30
RX900
0402
2 29 U102
RX900B
AD6548BCPZ
2 C124 28
RX1800
12.0pF
AD6548/9
0402 27
RX1800B
26
RX1900
C127
12.0pF 25
RX1900B
2 0402
17
VCC_REF
C129 33
GND
100nF
0402
C131 C132 C133
100nF 33.0nF 220nF
0402 0402 0402
U102
-85-
ANTENNA MATCHING
C100 L102 R101
1.5nH 5.0pF 0.00Ohm
0402 0402 0402
1 2 2 1 1
L103 C102
0.2pF NC
0402 0402
Resistor
Value
R103=15K
R106=NC
R103=NC
R106=TBD
R115
2.20Kohm
1 2 0402
C115
82.0pF R118
0402 2.20Kohm
1 2 0402
R119
1 2 2.20Kohm
0402
C118
82.0pF
0402 R121
1 2 2.20Kohm
0402
1 2
R122
C120 1.00Kohm C121
100nF 0402 39.0pF
0402 0402
7
LE
SEN
6
SCLK
SCLK
5 C125
SDATA
SDATA
R123 1.00nF
51.0Ohm 0402
21 1 2 1 2
REF_OP
0402
C126
20 47.0pF
REFIN
0402
19 1 3
REFINB G O
X100
26.0MHZ
8 SMD-3.2*2.5mm-4Pin
NC
13
VDD
1 2
VDD
R125
C130 10.0Ohm
100nF 0402
0402
LG Electronics
C134
100nF
C135 C136 0402
39.0pF 39.0pF
0402 0402
X100
AT100 AT101
OG-321022 OG-321022
2
VDD
R103
15.0Kohm
0402
GPIO48_BAND_SELECT 2
R106
NC
0402
GPIO48
BAND
_BAND_SELECT
"HI"
900/1800
"LOW"
850/1900
I 3
IB 3
Q 3
QB 3
VAFC 3
2
2
2
26MHZ 2