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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL DESCRIPTION
3.7.2.3. Synthesizer
WCDMA Transmitter Synthesizer
All RF frequencies are generated in the WCDMA Tx 4 GHz VCO, subsequently divided by
2 or 4 to arrive at the final frequency.
The WCDMA Tx RF-VCO is locked to the XO in a fractional N PLL consisting of a prescaler, a phase frequency
detector, a charge-pump, a sigma-delta modulator, and a fully integrated loop filter.
Automatic trimming of the VCO center frequency and the RC constant ensures that the variation of the PLL
dynamics is sufficiently low.
GSM/EDGE and WCDMA Receiver Synthesizer
All RF frequencies are generated in either of the two 4 GHz VCOs, subsequently divided by 2 or 4 (depending
on final frequency). The selection of either of the two VCOs is done using the digital bus.
The selected RF-VCO is locked to the XO in a fractional N PLL consisting of a prescaler, a phase-frequency
detector, a charge-pump, a sigma-delta modulator, and a fully integrated loop filter.
Automatic trimming of the VCO center frequency and the RC constant ensures that the variation of the PLL
dynamics is sufficiently low.
Figure 3-7-4. WCDMA Transceiver schematic
RF TRANCEIVER
TEMP SENSOR
closed to RF3300
0
R162
C178 33p
R168
DNI
R166
0
L120
NA
VDDA_2V8
R128
3.9nH
22p C167
4.3nH R125
C164 15p
WTXHB1
29
WTXHB2
33
WTXHB3
31
WTXIN
24
35
WTXLB
23
WTXLP
WTXQN
26
25
WTXQP
XON
17
18
XOP
MCLKSEC
20
57
PGND
37
RFCTRL1
RFCTRL2
36
STR
10
13
TESTOUT
27
VCCA1
VCCA2
51
VCCD
21
WRXHB1
38
WRXHB2
42
3
WRXIN
WRXIP
4
WRXLB
40
1
WRXQN
WRXQP
2
16
GND10
19
GND11
GND12
22
GND13
28
30
GND14
32
GND15
34
GND16
GND2
53
GND3
49
GND4
47
45
GND5
43
GND6
41
GND7
39
GND8
5
GND9
MCLK
15
CLK
12
14
CLKREQ
11
DATA
52
EAMMOD
8
EDATAA
EDATAB
9
EDATAC
6
EDATASTR
7
48
ERXHB1
50
ERXHB2
ERXLB1
44
ERXLB2
46
56
ETXHB
54
ETXLB
GND1
55
U111
RF3300
0
R151
DNI
C191
L118 10nH
DNI
R139
1800FB100
R124 390
33p C160
R136 270
2.2nH
L106
270R131
DNIR148
OUT
FL107
SAFEA1G88KB7F00
G1
2
G2
5
G3
3
IN
14
R150DNI
C181
100p
NA
L114
L105
NA
NA
L109
DNI
C187
PT100
4.7K
C165
DNI
NA
L112
DNI
C189
R132 270
DNI
R145
27R134
VDIGRAD_1V8
C169DNI
DNI
R159
0
R133
DNIR158
3.9pC159
DNI
R164
C179
10nH
2
GND1
GND2
4
1
HOT1
HOT2
3
26MHzTN4-26562
X100
8.2nH
L110
VRAD_2V8
DNI
R127
2.7p C170
10nH
L113
GND5GND6
10
IN_881_5
1
IN_942_5
4
OUT_881_5
9
6
OUT_942_5
FL104
SAWEN881MBA0F25
GND1
2
GND2
7
3
GND3
8
GND4
5
R149DNI
DNI
C188
L115
5.6nH
R143560
0R130
22p C163
VDDA_2V8
R129 27
0.01u C162
270R137
A
2
3
GND
5
VCC
Y
4
1
_OE
SN74LVC1G125DRLR
U108
3.3pC177
0
R161
5
G3
3
IN
14
OUT
0R144
G1
3
G2 G3
5
1
IN OUT
4
FL106
SAFEB1G95KA0F00
G1
2
G2
SAFEB897MAM0F00
FL105
2
0R157
VRAD_2V8
R142 18p
L104
3.3nH
R146
4.7K
GND1
2
GND2
7
3
GND3
8
GND4
5
GND5GND6
10
IN_1842_5
1
IN_1960
4
OUT_1842_5
9
6
OUT_1960
FL103
SAWEN1G84BC0F25
DNI
C161
R141
DNI
DNI
C185
DNI
R155
R165
0
3.3pC172
0R152
C1660.01u
DNI
R138
560R123
39nH L116
L117
2.2nH
R140
C180
0
DNI
1.8p
L119
DNI
R153
R126
0
NA
L107
L111
NA
WRX_BAND_1
WRX_BAND_2
WRX_BAND_8_5
TX_ADC_STRB_2V8
WTX_BAND_2_TO_PA
WTX_BAND_1_TO_PA
TX_ADC_STRB
MCLKSEC
GRX_1800
GRX_850
GRX_900
GTX_1800_1900
GTX_850_900
MCLK
WTX_BAND_8_5_TO_PA
WTX_I_N
WTX_I_P
WTX_Q_P
TX_ADC_STRB_2V8
GRX_1900
QDATA_AMP_MSB
IDATA_FREQ_MSB
AMP_FREQ_LSB
DATA_STR
WDCDC_EN
WRX_I_N
WRX_I_P
WRX_Q_N
WRX_Q_P
ADOUT
RTEMP
RF_CTRL_CLK
RF_CTRL_DATA
WTX_Q_N
RF_CTRL_STR_1
TESTOUT
MCLKREQ
GTX_VAM
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