An Oversampling ADC with Non-linear Quantizer for PCM CODEC

Shiro SAKIYAMA  George HAYASHI  Shiro DOSHO  Masakatsu MARUYAMA  Seizo INAGAKI  Masatoshi MATSUSHITA  Kouji MOCHIZUKI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.12   pp.1754-1760
Publication Date: 1995/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Low-power Analog, Digital LSIs and ASICs for Multimedia)
Category: 
Keyword: 
ITU-T G712,  oversampling,  ADC,  Quantizer,  SNR,  noise-shaping,  ΔΣ,  

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Summary: 
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.