A 0.6-V 82-dB delta-sigma audio ADC using switched-RC integrators

Author

Ahn, Gil-Cho ; Chang, Dong-Young ; Brown, Matthew E. ; Ozaki, Naoto ; Youra, Hiroshi ; Yamamura, Ken ; Hamashita, Koichi ; Takasuka, Kaoru ; Temes, Gábor C. ; Moon, Un-Ku

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA

Volume

40

Issue

12

fYear

2005

Firstpage

2398

Lastpage

2407

Abstract

A 0.6-V 2-2 cascaded audio delta-sigma ADC is described. It uses a resistor-based sampling technique which achieves high linearity and low-voltage operation without subjecting the devices to large terminal voltages. A low-distortion feed-forward topology combined with nonlinear local feedback results in enhanced linearity by reducing the sensitivity to opamp distortion, and allows increased input amplitude, resulting in higher SNDR. The modulator achieves 82-dB dynamic range and 81-dB peak SNDR in the A-weighted audio signal bandwidth with an OSR of 64. The total power consumption of the modulator is 1 mW from a 0.6-V supply. The prototype occupies 2.9 mm² using a 0.35-μm CMOS technology.

Keywords

CMOS integrated circuits; RC circuits; analogue-digital conversion; delta-sigma modulation; integrating circuits; 0.35 micron; 0.6 V; 1 mW; 82 dB; CMOS technology; audio signal bandwidth; delta-sigma audio ADC; low-distortion feed-forward topology; nonlinear local feedback; opamp distortion; resistor-based sampling technique; switched-RC integrator; Bandwidth; CMOS technology; Dynamic range; Feedback; Feedforward systems; Linearity; Nonlinear distortion; Sampling methods; Topology; Voltage; Delta-sigma ADC; low voltage; switched-RC;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2005.856286

Filename

1546216