LG KE990 Service Manual - Page 150
Main RF signal, Control signal
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6. BLOCK DIAGRAM Main RF signal Main RF signal GSM 850 TX DCS TX PCS TX GSM 850 RX DCS RX PCS RX TX_I/Q RX_I/Q Description GSM 850 TX RF Signal DCS TX RF Signal PCS TX RF Signal GSM 850 RX RF Signal DCS RX RF Signal PCS RX RF Signal I/Q for Tx of RF I/Q for Rx of RF Control signal Con trol sign al GSM PA_CTL signal GSM_PA_BAND GSM_PA_EN GSM_PA_RAMP RF Tranceiv er_CTL sign al TX_ON SSBDT_RTR FEM_CTL signal ANT_SEL 0,1,2 Description DCS or PCS /GSM Mode Selection Power Amp. Gain Control Enable Power Am p. Gain Con trol RF Enable Signal Bidirec tional SSBI Data Ant S witch Module Mod e Selection Comment Com ment GSM850Tx/Rx, DCS Tx/Rx, PCS Tx/Rx Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 151 - LGE Internal Use Only