- 73 -
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
Figure 3-7-4. WCDMA Transceiver schematic
B. Receiver Part
The W-CDMA receiver architecture is a direct down-conversion Zero Intermediate Frequency (ZIF)
receiver with integrated low-pass channel filter, i.e. the front-end receiver converts the aerial RF
signal
from W-CMDA band I down to a ZIF. The first stage consists of one single-ended low noise amplifier
(LNA) with a 16 dB gain step. This LNA is followed through an external filter by an IQ down-mixer
which consists of a mixer in parallel driven by quadrature out-of-phase LO signals. The In phase (I)
and Quadrature phase (Q) ZIF signal are then low pass filtered to provide protection from high
frequency offset interferer fed into the channel filter.
The front-end zero IF I and Q outputs are applied to the integrated low-pass channel filter with a
provision for 4 x 8 dB gain steps in front of the filter. The filter is a self-calibrated 6 pole, 2 zero filter
with a cut-off frequency around 2.15 MHz and a second order group delay compensation (2 poles, 2
zeroes). Once filtered,
the zero IF I and Q signals are further amplified with provision of 31 x 1 dB steps and DC offset
compensation.
The zero IF output buffer provides close rail-to-rail outputs signal.
Rev. F
Rev. F (Rev.1.0)
Rev. B
Rev. 1.0
External LDO (For RF3300)
Rev. F
Rev. 1.0
GND1
2
4
GND2
HOT1 1
3 HOT2
TEMP SENSOR
26MHz
TN4-26562
X101
G1
2
G2
3
5
GND
IN
1
4
OUT
FL105
SAFEB836MAL0F00
R148
DNI
2.7nH
A 2
3
GND
5
VCC
Y
4
1
_OE
R128
SN74LVC1G125DRLR
U108
R120
27
270
R122
R137
DNI
6.8p
R150
C149
47p
R127
2.7nH
R115
0
0ohm_0603_case1
R145
51
R142
560
L119
NA
C154
DNI
DNI
C146
1800
FB101
R114
4.7K
R123
270
VDDA_2V8
C145
15p
L116
NA
5.6nH
R149
NA
L109
R134
R113 DNI
0ohm_0603_case1_dni
C136
VRAD_2V8
DNI
1u
R143
DNI
270
R126
NA
L112
VDIGRAD_1V8
2.2nH
L107
L108
0.5p
CE
3
2
GND
PGND
5
4
VDD
VOUT
1
L117
RP101K282D
U106
39nH
DNI
C140
C148 3.3p
33p
C153
VBAT
0
R146
L106
3.3nH
DNI
R131
GND1
2
GND2
7
3
GND3
8
GND4
5
GND5
GND6
10
IN_881_5
1
IN_942_5
4
OUT_881_5
9
6
OUT_942_5
FL104
SAWEN881MBA0F25
L115
NA
SAFEA1G88KB7F00
FL106
2
G1
5
G2
3
G3
1
IN
OUT
4
R118
390
3.3p
C152
NA
L118
12p
C144
10
IN_1842_5
1
IN_1960
4
OUT_1842_5
9
6
OUT_1960
FL103
SAWEN1G84BC0F25
GND1
2
GND2
7
3
GND3
8
GND4
5
GND5
GND6
0
R147
R125
270
51
R153
0
R121
27
R124
R129
0
560
R119
1u
C128
10nH
L105
33p
C143
C139
22p
R152
51
DNI
C155
C147
DNI
33p
C142
18
XOP
WRXHB1
38
WRXHB2
42
3
WRXIN
WRXIP
4
WRXLB
40
1
WRXQN
WRXQP
2
WTXHB1
29
WTXHB2
33
WTXHB3
31
WTXIN
24
35
WTXLB
23
WTXLP
WTXQN
26
25
WTXQP
XON
17
GND4
47
45
GND5
43
GND6
41
GND7
39
GND8
5
GND9
MCLK
15
MCLKSEC
20
57
PGND
37
RFCTRL1
RFCTRL2
36
STR
10
13
TESTOUT
27
VCCA1
VCCA2
51
VCCD
21
48
ERXHB1
50
ERXHB2
ERXLB1
44
ERXLB2
46
56
ETXHB
54
ETXLB
GND1
55
16
GND10
19
GND11
GND12
22
GND13
28
30
GND14
32
GND15
34
GND16
GND2
53
GND3
49
RF3300
CLK
12
14
CLKREQ
11
DATA
52
EAMMOD
8
EDATAA
EDATAB
9
EDATAC
6
EDATASTR
7
DNI
C157
U110
DNI
R132
4.7K
PT101
VRAD_2V8
0.1u
C138
18nH
L114
L113
NA
1u
C131
NA
L111
2.7p
C141
8.2nH
L110
DNI
R138
16
17
18
19
2
20
21
3
4
5
6
7
8
9
SC100
1
10
11
12
13
14
15
C156
DNI
R133
0
5.6nH
R151
VDDA_2V8
WRX_BAND_5
GRX_900
GRX_1800
GRX_1900
DATA_STR
IDATA_FREQ_MSB
QDATA_AMP_MSB
WRX_BAND_2
GTX_VAM
VDDA_2V8
TX_ADC_STRB
MCLKSEC
EXT_LDO
WTX_BAND_2_TO_PA
TX_ADC_STRB_2V8
GRX_850
GTX_1800_1900
GTX_850_900
RF_CTRL_STR_1
MCLK
WTX_BAND_5_TO_PA
WRX_I_N
WRX_I_P
WRX_Q_N
WRX_Q_P
WTX_I_N
WTX_I_P
WTX_Q_P
TX_ADC_STRB_2V8
RF_CTRL_CLK
RF_CTRL_DATA
WTX_Q_N
TESTOUT
MCLKREQ
AMP_FREQ_LSB
WDCDC_EN
ADOUT
RTEMP
Содержание TU750
Страница 1: ...Service Manual Model TU750 Internal Use Only Service Manual TU750 Date January 2009 Issue 1 0 ...
Страница 216: ... 217 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 218: ... 219 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 221: ... 222 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...