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3. TECHNICAL BRIEF
3.7 RF Tranceiver(AD6548, U602)
3.7.1 GENERAL DESCRIPTION
The AD6548 provides a highly integrated direct conversion radio solution that combines, on a single
chip, all radio and power management functions necessary to build the most compact GSM radio
solution possible. The only external components required for a complete radio design are the Rx
SAWs, PA, Switchplexer and a few passives enabling an extremely small cost effective GSM Radio
solution.
The AD6548 uses the industry proven direct conversion receiver architecture of the OthelloTM family.
For Quad band applications the front end features four fully integrated programmable gain differential
LNAs. The RF is then downconverted by quadrature mixers and then fed to the baseband
programmable-gain amplifiers and active filters for channel selection. The Receiver output pins can be
directly connected to the baseband analog processor. The Receive path features automatic calibration
and tracking to remove DC offsets.
LGE Internal Use Only
Figure. 3-7-1 CIRCUIT DIAGRAM of RF Tranceiver
Copyright © 2009 LG Electronics. Inc. All right reserved.
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Only for training and service purposes
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