Technical Brief; General Description - LG -P970 Service Manual

3. TECHNICAL BRIEF

3. TECHNICAL BRIEF

3.1 GENERAL DESCRIPTION

The LG-P970 supports UMTS-900, UMTS-1900, UMTS-2100, GSM-850, GSM-850, GSM-900, GSM-1800, and GSM-
1900 based GSM/GPRS/EDGE/UMTS. All receivers and the UMTS transmitter use the radioOne1Zero-IF
architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband. The
quad-band GSM transmitters use a baseband-to-IF upconversion followed by an offset phase-locked loop that
translates the GMSK-modulated or 8-PSK-modulated signal to RF.
rF Block Diagram
FEM FEM
with
GSM
PAM
SKY77529
TX_LB
TX_HB
DET DET
W900
RXTX_L2
Duplexer
W2100
RXTX_H
Duplexer
W1900
RXTX_M1
Duplexer
RX_M2
850
RX_L1
1800
RX_M3
LGE Internal Use Only
VCTCXO
26MHz
VCONT
G850/G900
DCS/PCS
WCDMA
TX SAW
WCDMA
Dual PAM
ACPM-5281
WCDMA
TX SAW
CPL
W-PAM
WCDMA
ACPM-5202 TX SAW
CPL
PWR DET
RFIN1
1900
RX SAW
RFIN2
LNA
2100 2100
BGA749
RX SAW
RFIN4
900
RFIN5 RX SAW
RX SAW
RX SAW
[Figure 3-1] Block diagram of RF part
FSY2_CLK
XO XO
AFC_DAC
SYS_CLK
TX2G_L
TX2G_M
DI3_TX_DAT
DI3_TX_DATX
DI3_RX_DAT
DI3_RX_DATX
TX_3G_L
TX_3G_H
transceiver
PMB5703
TX_3G_M
PA_POW_DET
RX_M2
RX_M2X
RX H RX_H
RX_HX
RX_L1
RX_L1X
RX_L2 VDD_MAIN
RX_L2X
VDD_FSYS
RX_M1
RX_M1X VDD_IO
- 5 - Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
F26M
Di3_TX_DAT
Di3_TX_DATX
Di3_RX_DAT
Di3_RX_DATX
MP-eHM
PMB9801
2.85V_RF1
VRF1
VRF2
2.85V_RF2 2.85V RF2
1.8V_SD
VSD2
Only for training and service purposes