LG Electronics Inc.
1.3 Description of Transmit Part Circuit
1.3.1 RF Transmitter (U200)
The RF Transmitter(in QSC6075, base-band-to-RF Transmit Processor) performs all Tx signal-processing functions
required between digital base-band and the Power Amplifier Module (PAM). The base-band
quadrature signals are up-converted to the Cellular or PCS frequency bands and amplified to provide signal drive
capability to the PAM. The RFT includes an RF mixer for upconverting analog baseband to RF, a programmable PLL
for generating Tx LO frequency, two cellular and two PCS driver amplifiers and Tx power control through an 85 dB
VGA. As added benefit, the single sideband upconversion eliminates the need for a band pass filter normally required
between the upconverter and driver amplifier.
I, I/, Q and Q/ signals proceed from the QSC6055 are analog signal. In CDMA mode, These signals are modulated
by Quadrature Phase Shift King (QPSK). I and Q are 90 deg. out of phase, and I and I/ are 180 deg. Tx IF signal can
be obtained by mixing analog signal with 228.6MHz(Cellular)/263.6(PCS) 1st local osillator frequency which is
generated by Tx VCO. The Tx IF signal is amplified by AGC controlled by QSC6055. The second mixer on RFT
converts IF signals into RF signals. After passing through the upconverter , RF signal is inputted into the Power
Amplifier Module.
1.3.1.1 Cellular CDMA transmit signal path performance specifications
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Содержание VX8560
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Страница 102: ...LG Electronics Inc VX8560 2 TP4 PIN3 OF U511 XO XWYVYZ 102 235 Z 3 X B O X C O M ...
Страница 105: ...LG Electronics Inc VX8560 2 TP4 PIN3 OF U511 XO XW VYZ 105 235 Z 3 X B O X C O M ...
Страница 108: ...LG Electronics Inc VX8560 Circuit Diagram Circuit Diagram 1 TP1 C703 2 8V_LCD XW_VYZ 108 235 Z 3 X B O X C O M ...
Страница 112: ...LG Electronics Inc VX8560 Circuit Diagram Circuit Diagram 1 TP1 R722 CAM_PCLK XXYVYZ 112 235 Z 3 X B O X C O M ...
Страница 115: ...LG Electronics Inc VX8560 Test point Test point 1 TP1 R722 CAM_PCLK XX VYZ 115 235 Z 3 X B O X C O M ...
Страница 120: ...LG Electronics Inc VX8560 3 TP7 C122 MCLK WM8900 XYWVYZ 120 235 Z 3 X B O X C O M ...
Страница 121: ...LG Electronics Inc VX8560 4 TP8 C278 SLEEP X TAL XYXVYZ 121 235 Z 3 X B O X C O M ...
Страница 123: ...LG Electronics Inc VX8560 6 TP9 C617 LINEOUT_1R TP10 C619 LINEOUT_1L XYZVYZ 123 235 Z 3 X B O X C O M ...
Страница 125: ...LG Electronics Inc VX8560 3 TP7 C122 MCLK WM8900 XY VYZ 125 235 Z 3 X B O X C O M ...
Страница 126: ...LG Electronics Inc VX8560 4 TP8 C278 SLEEP X TAL XY VYZ 126 235 Z 3 X B O X C O M ...
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Страница 130: ...LG Electronics Inc VX8560 Circuit Diagram Circuit Diagram 1 TP1 C705 RCV TP2 C706 RCV XZWVYZ 130 235 Z 3 X B O X C O M ...
Страница 131: ...LG Electronics Inc VX8560 1 TP1 C705 RCV TP2 C706 RCV Test point Test point XZXVYZ 131 235 Z 3 X B O X C O M ...
Страница 142: ...LG Electronics Inc VX8560 2 TP2 R620 MIC_OUT 3 TP3 C282 MIC TP4 C605 LINPUT1 X YVYZ 142 235 Z 3 X B O X C O M ...
Страница 178: ...LG Electronics Inc VX8560 Appendix 1 Block Diagram Appendix 1 Block Diagram X _VYZ 178 235 Z 3 X B O X C O M ...
Страница 180: ...LG Electronics Inc VX8560 2 1 MAIN PCB CIRCUIT DIAGRAM 2 1 MAIN PCB CIRCUIT DIAGRAM X_WVYZ 180 235 Z 3 X B O X C O M ...
Страница 188: ...LG Electronics Inc VX8560 2 2 FPCB CIRCUIT DIAGRAM 2 2 FPCB CIRCUIT DIAGRAM X__VYZ 188 235 Z 3 X B O X C O M ...
Страница 195: ...LG Electronics Inc VX8560 3 3 FPCB Top Component Layout 3 3 FPCB Top Component Layout X VYZ 195 235 Z 3 X B O X C O M ...
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Страница 216: ...LG Electronics Inc VX8560 6 1 U109 BCM2046B1 6 1 U109 BCM2046B1 USED PIN NOT USED PIN YX VYZ 216 235 Z 3 X B O X C O M ...
Страница 217: ...LG Electronics Inc VX8560 6 2 U200 QSC6075 6 2 U200 QSC6075 USED PIN NOT USED PIN YX VYZ 217 235 Z 3 X B O X C O M ...
Страница 220: ...LG Electronics Inc VX8560 6 5 U510 TCC8322 6 5 U510 TCC8322 YYWVYZ 220 235 Z 3 X B O X C O M ...
Страница 221: ...LG Electronics Inc VX8560 6 5 U510 TCC8322 6 5 U510 TCC8322 USED PIN NOT USED PIN YYXVYZ 221 235 Z 3 X B O X C O M ...
Страница 223: ...LG Electronics Inc VX8560 7 1 AC adaptor 7 1 AC adaptor YYZVYZ 223 235 Z 3 X B O X C O M ...
Страница 230: ...LG Electronics Inc VX8560 7 2 Cigar Light Charger 7 2 Cigar Light Charger YZWVYZ 230 235 Z 3 X B O X C O M ...
Страница 233: ...LG Electronics Inc VX8560 7 3 USB Cable 7 3 USB Cable YZZVYZ 233 235 Z 3 X B O X C O M ...