Only For Training And Service Purposes - LG GT500 Service Manual

VBAT
C100 C101 C102
10u 0.1u 1000p
1
WTX_BAND_1_EN
2
BIAS_CTRL
3
WTX_BAND_1_TO_PA
4
C115 C116
1000p 1000p
VCC_WPA
WTX_BAND_2_EN
WTX_BAND_2_TO_PA
BIAS_CTRL
C133 DNI
WTX_BAND_8_5_TO_PA
C134 100p
R116 DNI
WTX_BAND_8_5_EN
VBAT
C148 C149 C150
10u 0.1u 1000p
C157 C158
1000p 1000p
BIAS_CTRL
3.7.3. WCDMA/EDGE/GPRS/GSM RF block
The transceiver is a multi-mode transceiver for WCDMA/EGDE/GPRS/GSM.
The EDGE/GPRS/GSM part of the transceiver use a digital baseband interface that is shared between
received and transmitted data. The receive interface is based on I and Q data and the transmitter interface
is based on envelope and frequency data.
The WCDMA part of the transceiver use differential analog in-phase and quadraturephase interfaces, that
is an IQ-interface, in the receiver and the transmitter data paths.
The EDGE/GSM/GPRS part of the transceiver has the following general features:
• Power class
- GMSK low bands: Class 4 (33 dBm)
- GMSK high bands: Class 1 (30 dBm)
- 8PSK low bands: Class E2 (27 dBm)
- 8PSK high bands: Class E2 (26 dBm)
- WCDMA: class 3 (+24dBm)
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

U102 SKY77182
9
PGND
8
VENB GND2
7
VCTRL GND1
6
RFIN RFOUT
5
VBIAS VCC
VBAT
U105 SKY77175
1 15
VEN_BAND_2 PGND
2 14
IN_BAND_2 GND4
3 13
GND1 OUT_BAND_2
4 12
VCC1 GND3
5 11
VCONT VC2
6 10
IN_BAND_5 VBIAS
9
OUT_BAND_5
7 8
VEN_BAND_5 GND2
U107 SKY77181
1 8
VBIAS VCC
C146 100p
2 7
RF_IN RF_OUT
3 6
VCONT GND2
5
GND1
4 9
VEN PGND C153 C154
1000p 0.1u
Figure 3-7-8. WCDMA PAM schematic
VDDA_2V8
VRAD_2V8
C110 C111
0.1u 22p
L100
18p
C118
NA
C117
NA
U103 LDC151G8620Q-359
1 4
OUT TER
2 3
IN COU
L101
1.8nH
U104 LDC151G8620Q-359
1 4
OUT TER
2 3
IN COU
U106 LDC15874M19Q-360
1 4
OUT TER
C147 22p
2 3
IN COU
L103
C155 C156
8.2nH
10u DNI
WCDMA PA Block
- 67 -
3. TECHNICAL DESCRIPTION
U100 LMV221
R102
1 6
VDD OUT
1K
R103
2 5
RF_IN REF
120
3 4
GND EN
WPOW_DET_EN
7 5
GND4 GND3
8 4
GND5 GND2
9 2
GND6 GND1
C119 100p
3
TX
1 6
RX ANT
FL100 SAYFP1G95AA0B00
3.6nH
C124
GND4 GND3
GND5 GND2
GND6 GND1
C135 100p
TX
RX ANT
FL101 ACMD-7407
C143
0.5p
GND4 GND3
GND5 GND2
GND6 GND1
C145 100p
TX
RX ANT
FL102 LT56B 6.8nH
C152
LGE Internal Use Only
WPOW_DET
C106
33nF
WRF_BAND_1
WRX_BAND_1
WRF_BAND_2
WRX_BAND_2
R652
WRF_BAND_8_5
0
WRX_BAND_8_5