Only For Training And Service Purposes - LG L704I Service Manual

3. TECHNICAL BRIEF
RF input and output ports of the SKY77318 are internally matched to a 50 Ω load to reduce the
number of external components for a quad-band design. Extremely low leakage current (2.5µ A,
typical) of the dual PA module maximizes handset standby time. The SKY77318 also contains
bandselect switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the
Band Select (BS) signal. In Figure below, the BS pin selects the PA output (DCS/PCS_OUT or
GSM_OUT) and the Analog Power Control (VAPC) controls the level of output power.
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Only for training and service purposes