Circuit Diagram - LG U300 Service Manual

7. CIRCUIT DIAGRAM

1 2 3 4
A
ANT100 ANT101 ANT102
L101
7.5nH
SW100
C199
G2
ANT RF
G1
6.8p
KMS-512
L104 C101
8.2nH 0.75p
B C106
33p
23
GND6 GND1
22
ANT
21
GND5
20
TRX U100
19
GND4
18
NC9 GND2
17
CXG1190AEQ
NC8
16
C NC7
15
NC6
14
NC5
D
E
C151
33p
VREG_W_PA
F
L123
R126
22nH
0
FL104
IS100
SFXG50KC701
ESI-3EAR1.950G01-T
C157
8 11
ANT TX_1950MHZ OUT IN
GND5 GND1 18p
5 3
RX_2140MHZ GND3 GND4 GND2
4
GND4 GND3 L127
1 6
0.5p
GND1 GND5
2 7
GND2 GND6
9
C GND7
13 10
PGND GND8
12
GND9
PA_ON
VREG_RFTX_2.85V
C166
12p
D
C174
1p
L131
1.8nH
L133 100nH
L134 R138
0
2.2nH
E C178
0.5p C179
680p
VREG_RFRX_1_2.85V
VREG_TCXO_2.85V
F
1 2 4
LG(42)-A-5505-10:01
5
1P7T SWITCH ANT_SEL0 ANT_SEL1 ANT_SEL2
H H L GSM_PA_BAND MODE
GSM 900 TX
LOW GSM
GSM 1800/1900 TX H L L
GSM900
DCS/PCS
HIGH
GSM1800 RX
L H H
DCS1800/PCS1900
GSM1900 RX L H L
OFF
GSM 900 RX L L H
UMTS RX/TX H L H
VREG_RFRX_0_2.85V FL100
C102 C103
SAFEB1G96FA0F00
0.1u 10p
5 4
G2 O2
IN
R101 1
ANT_SEL0 G1 O1
0 R102 2 3
ANT_SEL1
0 R103
ANT_SEL2
0
FL101
SAFEB1G84FA0F00
1
2 5 4
RX2
3 G2 O2
RX3 IN
4 1
G1 O1
RX4
5 2 3
RX1
6
7
NC1
8
NC2
9
NC3 R105 100
10
GSM_PA_BAND
NC4 FL102
C113
15p SAFEB942MFL0F00
5 4
R108 100
G2 O2
GSM_PA_EN
IN
1
G1 O1
C117
2 3
15p
L121 R110
24
9 1
DCS_PCS_OUT DCS_PCS_IN
C122 4.7nH C123 R115
2
1p 1p 200
BAND_SELECT R116
26
150
GND17
27 3
GND18 TX_ENABLE
28 U102
GND19
29 4
+VPWR
GND20 SMPY0008901 VBATT
30
MQW5V0C869M
GND21 C132 C605
31 5 10
GND22 GND 22u 0.01u R118 VC
32
220
GND23 RF3166
6 1
VRAMP OUT_GSM
R121 5
L122
15 OUT_DCSPCS
8 7
GSM_OUT GSM_IN
8
C138 8.2nH C139 R123 GND5
12
3.3p 3.3p 270
GND6
13
GND7
14
GND8
R125
GSM_PA_RAMP
0
GSM/DCS/PCS
RF5198
C150
SMPY0009601
1000p
C153
L124
4.7u
VREG_RFTX_2.85V
8.2nH
C154 C155
12 1
VCC21 RF_IN
11 2
VCC22 U104 GND 8.2p 5.6p
10 3
VCC23 VMODE
9 4
RF_OUT VREG L126
C159 3.9nH
0.01u
C158
NA
R1295.1K
HDET1
R130 R131 C165
10K 15K 0.01u
TR100
L128
UMC4N
4.7nH
FL105
L129
B7827
10nH
2 3
R134
1 G1 O1
IN C170 C171
G2 O2
0 10p
NA C168 NA
5 4 C176
L130 10p
C175
10nH
0.1u
L132
4.7nH 13 49
PLNA_OUT PGND
14 48
ILNA_OUT GLNA_BIAS
15 47
PLNA_BIAS GLNA_IN
16 46 R137
PLNA_IN U105 R_BIAS
17 45 11K
ILNA_BIAS VDDA8 (1%)
18 44
ILNA_IN RFR6250E SBST
19 43
VDDRF3 SBDT
20 42
RX_IP
RX_IP SBCK
21 41
RX_IM
RX_IM VDDM
22 40
RX_QP
RX_QP GRX_IP
23 39
RX_QM
RX_QM GRX_IM C180
24 38
VDDA2 GRX_QP
37
GRX_QM
C182 C183
0.1u 100p
C184 C188 C189 C186 C187
C185
10u 0.1u 5p R140 0.1u
0.01u 10p
0
R141
3.3K (1%)
C190 (PPS)
(2012)
C191 3.9n
470p
R142
4.7K (1%)
5 6 7 8
TX_VCO_EN_0_N TX_VCO_EN_1_N
HIGH LOW
LOW HIGH
HIGH HIGH
L102 2.7nH
L106 3.6nH
C105 1000p
1930-1990 MHz
L108 3.6nH
L110 2.7nH
L111 5.6nH
L112 7.5nH
C108 1000p 1805-1880 MHz
L114 7.5nH VREG_RFTX_2.85V
C111
L116
33p
5.6nH
L117 10nH
CP_HOLD2
29
CP2
30
0603
L118 9.1nH VDDA9
R106 0 31
RX_VCO_IN
R107 11K 32
C114 1000p R_BIAS
925-960 MHz (1%) 33
GSM1800_INN
34
L119 9.1nH
GSM1800_INP
35
VDDA10
36
L120 10nH
GSM900_INP
37
GSM900_INN
38
VDDA11
39
TX_MOD_CP
40
R111 VREG_RFTX_2.85V
C124 C125 C126 (PPS) VDDA12
82 41
120p
1000p 22n (2012) C129 TX_VCO_FB
42
0.1u
C118 C119
R114
10u 82p
R117 C130
51
47
100p
U103
FB100
3
VREG_RFTX_2.85V
VB
9 R119 100
GSM_TX_VCO_0_EN_N
SW1
11 R120 100
GSM_TX_VCO_1_EN_N
SW2
C143
C140 C133 R122
2 15p
33p 10u VREG_MSMP_2.7V
GND1
4
51
GND2 C142 C144 C145 C146
6 C141
15p
GND3 0.1u 0.1uF 0.01u 22p
7
GND4
SBCK
SBDT
SBST
WCDMA
FL103
EFCH1950TDC1
3
C156
R127
4 G3 1
OUT IN
G2 G1 0 12p
5 2
L125
8.2nH
X100
DSA321SC-19.2M
R128
1
TRK_LO_ADJ
VCONT
100
2
C162 GND
0.01u
19.2MHz
R133
VREG_TCXO_2.85V
C172
4.7
0.1u
C173 C169
0.1u 10u
SBST
SBDT
SBCK
VREG_MSMP_2.7V
R139
51 Section
C181
10p 1uF
Designer
VREG_TCXO_2.85V
Checked
Approved
9
- 143 -
14 15 16
DAC_REF
L100
TX_IM
2.2uH
C100
L103
47p
TX_IP
2.2uH
L107
TX_QM
2.2uH
C104
L109
47p
TX_QP
2.2uH
R104
VREG_RFTX_2.85V
10
C107
0.1u
L113
VREG_SYNTH_2.85V
47nH
C109 C110
33p
0.1u
L115
VREG_RFTX_2.85V
47nH
C112
0.1u
RX_IM
RX_IN
14
RX_IP
RX_IP
13
RX_QN RX_QM
12
RX_QP
RX_QP
11
VDDA4
10
C115
VCO_TUNE C116
U101 9
1uF 47p
VTUNE_REF R109
8
VDDA3 10
7
RTR6250D TCXO
6
VDDA2
5 R113
VREG_RFTX_2.85V
VDDA1 6.2K (1%)
4 R112
C121
FAQ1 C120
3 6.2K (1%)
CP1 0.1u 33p
2
CP_HOLD1 (PPS) C127 C128
1
(2012)
3.9n 390p
C131
0.01u
ECHU1C392JX5
VREG_RFTX_2.85V
C134 C135 C136 C137
33p 33p 100p 0.1u
R124
TX_AGC_ADJ
1K
C147
4700p
RF_ON_TX_ON
C149
100p
C152
1000p
C161
TCXO_PM
100p
3
TCXO_BT_IN
OUT
4
VREG_TCXO_2.85V
VCC
C163 C164
1000p 0.1u
C167
1000p
R135
VREG_RFTX_2.85V PA_THERM
80.6K
RT100
(1%) R136 C177
68K
470K
0.068u
(1%)
Date Sign & Name Sheet/
Sheets
U300
MODEL
22/MAR/2006 H. C. LEE
1/7
RF
DRAWING
(RF3166 & RF5198)
DRAWING
LG Electronics Inc. U300_REV_1.1
NO.
LG Electronics Inc.
A
B
C
D
E
F
C
D
E