An Oversampling ADC with Non-linear Quantizer for PCM CODEC

概要

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This paper describes an oversampling analog-to-digital converter (ADC) suitable for PCM codecs. Nonlinear 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 mm^2. Maximum power consumption is 12.8 mW with a single +3 V power supply including DAC and TONE generator.
社団法人電子情報通信学会の論文
1995-12-25