Technical Brief; General Description - LG U890 Service Manual

3. TECHNICAL BRIEF

3. TECHNICAL BRIEF

3.1 General Description

The U890 supports UMTS-2100 DS-WCDMA, EGSM-900, DCS-1800, and PCS-1900. All receivers
and the UMTS transmitter use the radioOne1Zero-IF architecture to eliminate intermediate
frequencies, directly converting signals between RF and baseband. The EGSM, DCS1800 and
PCS1900 transmitters use a baseband-to-IF upconversion followed by an offset phase-locked loop
that translates the GMSK-modulated signal to RF.
U890 high-level RF functional block diagram
1 QUALCOMM's branded chipset that implements a Zero-IF radio architecture.
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