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An Oversampling ADC with Non-linear Quantizer for PCM CODEC
Shiro SAKIYAMA George HAYASHI Shiro DOSHO Masakatsu MARUYAMA Seizo INAGAKI Masatoshi MATSUSHITA Kouji MOCHIZUKI
IEICE TRANSACTIONS on Electronics
Publication Date: 1995/12/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Low-power Analog, Digital LSIs and ASICs for Multimedia)
ITU-T G712, oversampling, ADC, Quantizer, SNR, noise-shaping, ΔΣ,
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This paper describes an oversampling analog-to-digital converter (ADC) suitable for PCM codes. Non-linear 5-level quantizer is implemented to noise-shaping modulator. This ADC meets the specifications of ITU-T G.712, in spite of using first order delta-sigma modulator, and realizes low power operation. This chip is fabricated in 0.8 µm double-poly and double-metal CMOS process and occupies a chip area of 15 mm2. Maximum power consumption is 12.8 mW with a single +3 V power supply including DAC and TONE generator.