Technical Brief; General Description - LG TU550 Service Manual

3. TECHNICAL BRIEF

3.1 General Description

The TU550 supports UMTS-850, UMTS-1900, GSM-850, GSM-900, DCS-1800, and PCS-1900 based
GSM/GPRS/EDGE/UMTS/HSDPA. All receivers and the UMTS transmitter use the radioOne
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
phaselocked loop that translates the GMSK-modulated or 8-PSK-modulated signal to RF.
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
Fig 3.1 Block diagram of RF part
- 17 -
3. TECHNICAL BRIEF
LGE Internal Use Only
1 Zero-IF