Technnical Brief; General Description - LG GT540 Service Manual

3. TECHNICAL BRIEF
3. TECHNICAL BRIEF

3.1 GENERAL DESCRIPTION

The GT540 supports UMTS-900, 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.
Swift RF Block Diagram
W2100
DUPLEXER
W(1900)
DUPLEXER
FRONT
END
MODULE Rx SAW
SKY77544
Ant Sel 0,1,2,3
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
W900
WCDMA
Coupler
PAM
TX SAW
WCDMA
W2100
Coupler TX SAW
PAM
WCDMA
W1900
W900
Coupler TX SAW
DUPLEXER PAM
W2100
RX saw
LNA
GPS_LNA_EN
GSM 850
RX SAW
GSM 900
RX SAW
DCS1800
RX SAW
PCS1900
RX SAW
[Figure 1-1] Block diagram of RF part
RTR6285
HB_RF_OUT3
HB_RF_OUT2
LB_RF_OUT2
TCXO
TX_BIAS
PRX_IP
PDET_IN
PRX_IN
WPRXLBP PRX_QP
WPRXLBN PRX_QN
WPRXHBP
DRX_IP
WPRXHBN
DRX_IN
WPRXSE2_IN
DRX_QP
WPRXSE2_OUT
DRX_QN
WB_MX_INP
WB_MX_INM
GPS_IN
TX_QP
TX_QN
LB_RF_OUT1
TX_IP
TX_IN
HB_RF_OUT1
GCELL_INP
DAC_IREF
GCELL_INN
SBDT
EGSM_INP
RF_ON
EGSM_INN
DCS_INP
DCS_INN
WPRXSE1_IN
GPCS_INP
GPCS_INN
VDDA
- 19 -
3. TECHNICAL BRIEF
LGE Internal Use Only
D-Flip
VCTCXO
TRK_LO_ADJ
19.2MHz
Flop
USBPHY_SYSCLK
BUFFER
PM7540
TCXO_IN TCXO_EN GPIO_105
SSBI TCXO_OUT TCXO
I_IP_CH0
I_IM_CH0
Q_IP_CH0
Q_IM_CH0
I_IP_CH1
I_IM_CH1
Q_IP_CH1
Q_IM_CH1
MSM7227
I_OUT_P
I_OUT_N
Q_OUT_P
Q_OUT_N
DAC_REF
GPIO_59
TX_ON
GPIO_106
WCDMA_900_ON GPIO_22
WCDMA_1900_ON GPIO_110
WCDMA_2100_ON PA_ON0
GPIO_58
GPIO_72
GPIO_73
GPIO_74
GPIO_75
Challenge 123
LGE Internal Use Only