LG -T300 Service Manual page 38

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
well 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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Only for training and service purposes
Figure. 3.5.4 PA AND FEM CONTROL BLOCK DIAGRAM
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
LGE Internal Use Only