Rf Tranceiver(Ad6548, U501) - LG GM200 Service Manual

3. TECHNICAL BRIEF

3.14 RF Tranceiver(AD6548, U501)

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
LGE Internal Use Only
Figure. 31-4-1 RF Transceiver Block Diagram
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Only for training and service purposes