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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
BL20
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3.4.3 GSM850/EGSM/DCS/PCS Dual band Transmit Power Amplifier
(U101: TQM7M5012)
The dual band PA is operating to transmit for low band (GSM-850, GSM-900) and high band (GSM-1800,
GSM1900). Operating mode is selected and controlled by the QSC6270.(GSM_PA_BAND)
[Figure 1.4.3] GSM900 /DCS/PCS TX Power Amplifier path
B9442
DNI
ANT_SEL(0)
ANT_SEL(1)
ANT_SEL(2)
ANT_SEL(3)
GSM_PA_RAMP
TX_GSM_LB
TX_GSM_HB
GSM_PA_BAND
GSM_PA_EN
3dB
3dB
GSM TX
EGSM Tx
B9442
SFSY0037601