LG -A290 Service Manual page 17

3.1.10 Integrated RF Transmitter
• Offset phase lock loop.
• IQ modulator DC offset calibration by BB ADC/DAC.
• Precise quadrature by IF divide-by-4.
• Integrated loop filter.
3.1.11 Integrated RF Frequency Synthesizer
• Programmable fractional-N synthesizer.
• Integrated wide range RFVCO.
• Integrated loop filter.
• Fast setting time suitable for multi-slot SPRS applications.
3.1.12 Integrated RF Digitally-Controlled Crystal Oscillator(DCXO)
• One-pin 6MHz crystal oscillator.
• On-chip programmable capacitor array for cross tune.
3.1.13 Radio Interface and Baseband Front End
• GMSK modulator with analog I and Q channel outputs.
• 10-bit D/A Converter for uplink baseband I and Q signals.
• 14-bit high resolution A/D Converter for downlink baseband I and Q signals.
• Calibration mechanism of offset and gain mismatch for baseband A/D Converter and D/A
Converter.
• 10-bit D/A Converter for Automatic Power Control.
• Programmable Radio RX filter with adaptive bandwidth control.
• Dedicated Rx filter for FB acquisition.
• 6-Pin Baseband Parallel Interface(BRI) with programmable driving strength.
• Multi-band support.
3.1.14 Voice and Modem CODEC
• Digital tone generation.
• Voice Memo.
• Noise Reduction.
• Echo Suppression.
• Advanced Sidetone Oscillation Reduction.
• Digital sidetone generator with programmable gain.
• Two programmable acoustic compensation filters.
• GSM/GPRS quad vocoders for adaptive multirate(AMR), enhanced full rate(EFR), full.
rate(FR), and half rate(HR).
• GSM channel coding, equalization and A5/1, A5/ and A5/3 ciphering.
• GPRS GEA1, GEA and GEA3 ciphering.
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3. TECHNICAL BRIEF
Only for training and service purposes