LG GT500 - Page 67

- 68 -
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL DESCRIPTION
Figure 3-7-9. GSM Transceiver Architecture
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.
GSM/EDGE
PA + Ant Sw.
ANT
VAPC
RADCLK
RADDAT
RADSTR
VBAT
2.75 V
VRAD
1.8 V
VIO
PA
PA
GSM850/
900 Input
DCS/PCS
Input
ESD
2.75 V
VRAD
LNA
LNA
LNA
LNA
LNA
A
D
A
D
0
90
LPF
+
ChP PhD
÷
N.M
VCO
LPF ChP PhD
÷
N.M
+
0
90
+
DAC
DAC
XO
DAC
VCO
VCO
LNA
LNA
WCDMA LB
WCDMA HB
WCDMA HB
WCDMA HB
CLK
DATA
STROBE
Serial
Control
WTxQB
WTxQA
WTxIB
WTxIA
GSM/EDGE
AM
DAC
RFCtrl1
RFCtrl2
RFCtrl1
RFCtrl2
GSM/
EDGE HB
GSM/
EDGE LB
WCDMA LB
WCDMA HB
WCDMA HB
GSM/EDGE
LB
GSM/EDGE
LB
GSM/EDGE
HB
GSM/EDGE
HB
WRxIA
WRxIB
WRxQB
WRxQA
EDataA
EDataB
EDataC
EDataStr
WCDMA/GSM/GPRS/EDGE TRX
MCLK
CLKREQ
MCLKSec
XO
XOn
XOp
26MHz
X-tal
VBAT
VccWPA
VccWPA
Power
coupler
Power
coupler
VccWPA
VccWPA
RF Pow det
Det
En
Bias
DET
En
Bias
DET
En
Bias
DET
En
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
824 – 915 MHz
1710 – 1910 MHz
1930 – 1990 MHz
1805 – 1880 MHz
925 – 960 MHz
869 – 894 MHz
WDCDCREF
WPOW_DET _EN
FB
Switch
PWM/PFM
En
Control
Logic
RFCtrl1