Only For Training And Service Purposes - LG GT500 Service Manual

3. TECHNICAL DESCRIPTION
ANT
ESD
UL: 1920 – 1980 MHz
DL: 2110 – 2170 MHz
UL: 1749.9 – 1784.9 MHz
DL: 1844.9 – 1879.9 MHz
UL: 830 – 840 MHz
DL: 875 – 885 MHz
3.7.3.1. Transmitter Part
Transmitter
There are two transmitter blocks, one for GSM/EDGE and one for WCDMA.
GSM/EDGE Transmitter Block
• A separate block is used to convert the digital bit streams from the baseband into parallel words to be used in
the DACs and Sigma Delta modulator. This block also includes programmable delays for optimizing timing
between the different modulation paths. A separate output is generated for the auto-tuning block of the
second FM path. The block also outputs a low-frequency square wave to the FM paths, to enhance the speed of
the auto tuning for the second FM path.
LGE Internal Use Only
VBAT
1930 – 1990 MHz
1805 – 1880 MHz
925 – 960 MHz
869 – 894 MHz
VAPC
GSM850/
824 – 915 MHz
900 Input
PA
DCS/PCS
Input 1710 – 1910 MHz
PA
VBAT
GSM/EDGE
PA + Ant Sw.
VccWPA
Power
coupler
Power
coupler
2.75 V
VRAD
RF Pow det
Det
En
WPOW_DET_EN
Figure 3-7-9. GSM Transceiver Architecture
GSM/EDGE
HB
LNA
GSM/EDGE
HB
LNA
GSM/EDGE
LB
LNA
GSM/EDGE
LB
LNA
WCDMA HB
LNA
WCDMA HB
LNA
WCDMA LB
LNA
GSM/
EDGE LB
GSM/
EDGE HB
WDCDCREF
PWM/PFM
DAC
Switch En RFCtrl1
GSM/EDGE
Control
Logic
AM +
FB
VccWPA
RFCtrl1
RFCtrl1
RFCtrl2
RFCtrl2
DET
Bias En
WCDMA HB
VccWPA
WCDMA HB
WCDMA HB
DET
Bias En
WCDMA LB
VccWPA
XOn
XO
XOp
26MHz
X-tal
DET
En
Bias
- 68 - Copyright © 2009 LG Electronics. Inc. All right reserved.
WCDMA/GSM/GPRS/EDGE TRX
WRxIA
WRxIB
0
90
WRxQA
WRxQB
EDataStr
A
EDataA
D
EDataC
A
EDataB
D
VCO
÷
VCO
N.M
+
XO
LPF ChP PhD
DAC
DAC
DAC
CLK
Serial DATA
LPF ChP PhD
Control STROBE
÷
VCO
N.M
WTxIA
WTxIB
0
+
90
WTxQA
WTxQB
MCLK
MCLKSec
CLKREQ

Only for training and service purposes

2.75 V
VRAD
1.8 V
VIO
RADCLK
RADDAT
RADSTR