LG U250 Service Manual page 138

Main RF signal
Control signal
Control signal
UMTS PA_CTL signal
PA_R0
GSM PA_CTL signal
GSM_PA_BAND
GSM_PA_EN
GSM_PA_RAMP
ANT_SEL 0,1
Description
UMTS Tx High/Low Power Control
DCS or PCS /GSM Mode Selection
Power Amp Gain Control Enable
Power Amp Gain Control
Ant Switch Module Mode Selection
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6. BLOCK DIAGRAM
Comment
UMTS,
GSM900Tx/Rx,
DCS Tx/Rx,
PCS Tx/Rx