Only For Training And Service Purposes - LG GB220 Service Manual

3.5.2.3 Front-end/PA Control Interface
Two outputs (FE1, FE2) for direct control of antenna switch modules enable to select RX- and TX-mode as wel
as low- and high-band operation.
An extra band select signal PABS for the power amplifier is used, to support discrete PA and switching
modules. Time accurate power dissipation of the PA is achieved by the control signal PAEN.
A minor set of power amplifiers require a bias voltage to enhance power efficiency. Support of this power
amplifiers is achieved by the implemented bias DAC.
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Copyright © 2009 LG Electronics. Inc. All right reserved.

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Figure. 3.5.4 PA AND FEM CONTROL BLOCK DIAGRAM
Copyright © 2007 LG Electronics. Inc. All right reserved.
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3. TECHNICAL BRIEF
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