Technical Brief; General Description; Only For Training And Service Purposes - LG U990 Service Manual

3. TECHNICAL BRIEF

3.1 General Description

The U990 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based
GSM/GPRS/EDGE/UMTS. 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
phase-locked 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 1.1] Block diagram of RF part
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3. TECHNICAL BRIEF
1 Zero-IF
LGE Internal Use Only