LG KU580 Service Manual - Page 75

3. Technical Brief A. Front End Part SKY77513 TX-RX Front End Module (FEM) offers a complete transmit VCO-to-Antenna and Antennato-receive SAW filter solution in a low profile (1.2 mm), compact form factor for handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation, Polar EDGE modulation, and provides single UMTS band (band 1 or band 2) antenna switch-through via a dedicated UMTS port. Figure 3-7-9. SKY77513 Functional Block Diagram VAPC TX_DCSPCS ANTSW0 ANTSW1 ANTSW2 C105 22p C109 22p C110 22p VBAT C100 22p C101 0.01u C102 10u C103 10u 48 GND34 49 GND35 50 GND36 51 GND37 52 GND38 53 GND39 54 GND40 55 GND41 56 GND42 57 GND43 58 GND44 59 GND45 60 GND46 61 GND47 62 GND48 1 ENABLE 2 DCS_PCS_IN 3 BS_1 4 BS_2 5 VBATT 6 VAPC 7 GSM_IN 8 MODE 9 GND1 10 GND2 11 GND3 12 GND4 13 GND5 14 DCS_RX1 15 DCS_RX2 16 GSM_RX1 U101 SKY77513 32 GND18 31 GND17 30 GND16 29 GND15 28 GND14 27 GND13 26 WCDMA 25 GND12 24 GND11 23 GND10 22 GND9 21 ANT 20 GND8 19 GND7 18 GND6 17 GSM_RX2 WRF_BAND_I C112 22p KMS-512 SW100 G2 RF ANT G1 L102 NA C113 0 L103 22nH R100 NA R101 NA ANT100 OUT100 0 R102 NA R103 R107 NA L100 1.2nH L101 12nH R104 0 R105 0 OUT101 GND100 GND101 WPA_BIAS WTXMOD_BAND_I 33 GND19 34 GND20 35 GND21 36 GND22 37 GND23 38 GND24 39 GND25 40 GND26 41 GND27 42 GND28 43 GND29 44 GND30 45 GND31 46 GND32 47 GND33 R114 51 R113 NA TX_GSM_900 RX900 RX1900 RX1800 Figure 3-7-10. Front End part schematic LGE Internal Use Only - 76 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes