Technical Brief; Rf General Description - LG E900 Service Manual

3. TECHNICAL BRIEF

TECHNICAL BRIEF
3. TECHNICAL BRIEF

3.1 RF GENERAL DESCRIPTION

The E900 supports UMTS-900(Band VIII), UMTS-1900(Band II), UMTS-2100(Band I), 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 up-conversion followed by an offset
phase-locked loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF
System HW Block Diagram ; RTR6285 and RF / GPS
SBDT_SSBI
TCXO_OUT
PM7540
Buck
Converter
FRONT
W900 DPX
END
MODULE
W2100 DPX
SKY77544
W1900 DPX
GSM Quad
PAM
GSM
RX SAW
GSM
RX SAW
GSM
RX SAW
GSM
RX SAW
BS1
BS2
MODE
_TXEN
LGE Internal Use Only
GPS
RX SAW
Diplexer
FILTER LNA
RX SAW Diversity
FILTER LNA
External
WCDMA
LNA
RX SAW
WCDMA PAM
WCDMA
WCDMA 900
TX SAW
CPL
(W900)
TX
WCDMA PAM
WCDMA
WCDMA 2100
TX SAW
CPL
(W2100)
TX
WCDMA PAM
WCDMA
WCDMA 1900
TX SAW
CPL (W1900)
TX
W2100
RX SAW
FILTER
G850/900 TX
DCS/PCS TX
GSM850 RX
GSM900 RX
GSM1800 RX
GSM1900 RX
Figure.1 QSD8650 platform
- 22 -
VCTCXO
19.2MHz
VCONT
GPS_IN
TCXO
WDRXHB2
WPRXLBN TRK_LO_ADJ
WPRXLBP
GPS
VDDA / VDDM
Flip-Flop
WPRXHBP
WPRXHBN
RTR6285
LB_RF_OUT2
TX_IQ
HB_RF_OUT2
HB_RF_OUT3
PRX_IQ
PDET_IN
WPRXSE2
DRX_IQ
WPRXSE2_OUT
WB_MX_INP
WB_MX_INM
LB_RF_OUT1
HB_RF_OUT1
SBDT
GCELL_INP
GCELL_INN
RF_ON
EGSM_INP
EGSM_INN
DCS_INP
DAC_IREF
DCS_INN
GPCS_INP
GPCS_INN
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
PMIC_SSBI
TCXO
CK
D
TRK_LO_ADJ
QSD8650
TX_IQ
PRX_IQ
DRX_IQ
SBDT_RTR
TX_ON
DAC_IREF
ANT_SEL0/1/2/3