LG KE990 Service Manual - Page 147

Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 148 - ESM6270 [Figure 2.1] EGSM-900/DCS-1800/PCS-1900 RF Functional Block Diagram 6. BLOCK DIAGRAM 6. BLOCK DIAGRAM 6.1 GSM RF Block SW pad pad H-BPF L-BP F GSM/EDGE PA G900 Tx BPF G SM85 0 Rx BPF GS M1 80 0 Rx BPF GS M1 90 0 Rx BPF BPF BPF BPF BPF Q uadrature Upconverter Qua drature Upconverter LPF DAC_REF LPF Power Detector LO ge neration & Distribution Q uadrature Downconverter F ref F ref PL L # 1 VCO LPF & DC Correction LPF RT R6275_TCXO Qu adrature Downconverter LPF & DC Correction Ctls Quad rature Downconverter LPF & DC Correction F ref P LL #2 VCO Dugital IO s & controls LPF VDDM LGE Internal Use Only Phone VCTCXO RTR627 5_ TCX O PM6650 Input P ower Ma nagemen t Vo ltag e Reg ulators G enera l Housekeepin g User Interfaces IC Interfaces MSM_TCXO