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3. TECHNICAL BRIEF
3.1 General Description
The KU380 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/UMTS.
All receivers and the UMTS transmitter use the radioOne
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 signal to RF.
Front
End
Module
1
QUALCOMM's branded chipset that implements a Zero-IF radio architecture.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Bluetooth
RF Module
VCTCXO
GSM Block
GSM900 Tx
GSM
TX SAW
GSM
PAM
GSM1800/1900 Tx
GSM900 Rx
GSM1800 Rx
GSM1900 Rx
WCDMA Block
WCDMA
WCDMA
COUPLER
TX SAW
PAM
WCDMA2100 Tx
Duplexer
WCDMA2100 Rx
WCDMA
RX SAW
AntSW Logic
[Fig 1.1] Block diagram of RF part
3. TECHNICAL BRIEF
1
Zero-IF architecture to eliminate intermediate
PM6650
-2M
GSM
VCO
MSM6245
RTR6275
HDET
WCDMA
VCO
- 17 -
USB
SPK/RCV
MIC
MAIN LCD
1.3M CAM
VGA CAM
U-SIM
NAND, SDRAM
FLASH
KEYPAD
LGE Internal Use Only
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Troubleshooting
