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2.3 Circuit Description
2.3.1 Keypad/LCD and Receptacle Part
Once the keypad is pressed, the key signals are sent out to QSC6075T for processing. In addition, when the key is
pressed, the keypad lights up through the use of 2 LEDs. The terminal status and operation are displayed on the
screen for the user with the characters and icons on the LCD.
Moreover, it exchanges audio signals and data with external sources through the receptacle, and then receives power
from the battery or external batteries.
2.3.2 Audio Processing Part
MIC signals are amplified through OP AMP, inputted into the audio codec(included in QSC6075T) and converted
into digital signals. Oppositely, digital audio signals are converted into analog signals after going through the audio
codec. These signals are amplified at the audio amplifier and transmitted to the ear-piece. The signals from
QSC6075T activate the ringer by using signals generated in the timer in QSC6075T.
2.3.3 MODEM Part
QSC6075T is the core element of CDMA system terminal that includes ARM926 EJS microprocessor core. It
supports both CDMA and GPS, operating in both the cellular and PCS spectrums. The subsystems within the
QSC6075T include a CDMA processor, a multi-standard Vocoder, an integrated CODEC with earpiece and
microphone amplifiers, general-purpose ADC for subsytem monitoring, an ARM926 EJS microprocessor, and both
Universal Serial Bus(USB) and an RS-232 serial interfaces supporting forward and reverse link data communications
of 307.2 Kbps simultaneously. And it also contains complete digital modulation and demodulation systems for
CDMA standards, as specified in IS-95-A/B/C.
In QSC, coded symbols are interleaved in order to cope with multi-path fading. Each data channel is scrambled by
the long code PN sequence of the user in order to ensure the confidentiality of calls. Moreover, binary quadrature
codes are used based on walsh functions in order to discern each channel. Data created thus are 4-phase modulated
by one pair of Pilot PN code and they are used to create I and Q data.
When received, I and Q data are demodulated into symbols by the demodulator, and then de-interleaved in reverse to
the case of transmission. Then, the errors of data received from viterbi decoder are detected and corrected. They are
voice-decoded at the vocoder in order to output digital voice data.
LG511C
Содержание LG511C
Страница 1: ...Internal Use Only Service Manual LG511C Date September 2011 Issue 1 0 ...
Страница 28: ...LG Electronics Inc LN510 27 168 Figure 1 1 Block Diagram of LG511C LG511C ...
Страница 30: ...LG Electronics Inc LN510 29 168 LG511C ...
Страница 50: ...LG Electronics Inc LN510 49 168 Waveform Waveform 4 1 1 c 4 1 1 d U1001 pin2 U1003 pin1 ...
Страница 59: ...LG Electronics Inc LN510 58 168 Fig 4 1 2 c Fig 4 1 2 d U1001 pin2 U1003 pin2 Waveform Waveform ...
Страница 96: ...LG Electronics Inc LN510 95 168 1 ...
Страница 98: ...LG Electronics Inc LN510 97 168 1 2 3 4 5 LG511C ...
Страница 108: ...LG Electronics Inc LN510 107 168 Test points Test points 1 TP1 4 TP4 2 TP2 3 TP3 5 TP5 LG511C ...
Страница 118: ...LG Electronics Inc LN510 117 168 Test point Test point TP 2 TP 2 TP 3 TP 4 TP 5 TP 6 TP 7 X 1601 U 1601 F 1601 TP 1 ...
Страница 134: ...LG Electronics Inc LN510 133 168 Appendix Appendix ...
Страница 136: ...LG Electronics Inc LN510 135 168 Appendix 2 Circuit diagram Appendix 2 Circuit diagram ...
Страница 144: ...LG Electronics Inc LN510 143 168 Appendix 3 BGA Pin Map Appendix 3 BGA Pin Map ...
Страница 145: ...LG Electronics Inc LN510 144 168 Not Used 3 1 U1601 BCM2070_BT 3 1 U1601 BCM2070_BT ...
Страница 146: ...LG Electronics Inc LN510 145 168 3 2 U2001 QSC6075T 3 2 U2001 QSC6075T ...
Страница 147: ...LG Electronics Inc LN510 146 168 3 3 U3001 H8BCS0SI0BAR 46M_MEMORY 3 3 U3001 H8BCS0SI0BAR 46M_MEMORY ...
Страница 148: ...LG Electronics Inc LN510 147 168 All Pin Used 3 4 U4004 TSC2007IYZGR_TOUCH IC 3 4 U4004 TSC2007IYZGR_TOUCH IC ...
Страница 149: ...LG Electronics Inc LN510 148 168 3 5 U4002 LM49151_AUDIO AMP 3 5 U4002 LM49151_AUDIO AMP ...
Страница 150: ...LG Electronics Inc LN510 149 168 Not Used 3 6 U5001 BU1851GUW _ Qwerty IC 3 6 U5001 BU1851GUW _ Qwerty IC ...
Страница 151: ...LG Electronics Inc LN510 150 168 Appendix 4 Component Layout Appendix 4 Component Layout ...
Страница 152: ...LG Electronics Inc LN510 151 168 4 1 Main PCB Component Layout 4 1 Main PCB Component Layout ...
Страница 154: ...LG Electronics Inc LN510 1 168 4 2 KEY PCB Component Layout 4 2 KEY PCB Component Layout 4 Hmsdqm k Trd Nmkx ...
Страница 155: ...LG Electronics Inc LN510 1 168 4 2 KEY PCB Component Layout 4 2 KEY PCB Component Layout 4 Hmsdqm k Trd Nmkx ...
Страница 157: ...LG Electronics Inc LN510 15 168 4 3 F PCB Component Layout 4 3 F PCB Component Layout 4 CON104 Hmsdqm k Trd Nmkx ...
Страница 161: ...LG Electronics Inc LN510 1 Appendix 6 Part List Appendix 6 Part List LG511C ...