A 110µW single bit audio continuous-time oversampled converter with 92.5 db dynamic range

Author

Pavan, Shanthi ; Sankar, Prabu

Author_Institution

Indian Inst. of Technol., Madras, Chennai, India

fYear

2009

fDate

14-18 Sept. 2009

Firstpage

320

Lastpage

323

Abstract

The first integrator in a low pass continuous-time DeltaSigma modulator normally consumes significant power due to stringent noise and linearity requirements, especially in single-bit designs. We introduce the ldquoassisted opamp integratorrdquo that addresses this problem. The efficacy of our technique is borne out by measurements from a 15 bit audio converter designed in a 0.18 mum CMOS technology. It achieves 92.5 dB dynamic range in a 24 kHz bandwidth and dissipates 110 muW from a 1.8 V supply. The Figure of Merit (FOM) of this modulator is 66.5 fJ/level.

Keywords

CMOS digital integrated circuits; audio equipment; continuous time systems; delta-sigma modulation; integrating circuits; operational amplifiers; CMOS technology; DeltaSigma modulator; assisted opamp integrator; bandwidth 24 kHz; continuous-time delta-sigma modulation; power 110 muW; single bit audio continuous-time oversampled converter; size 0.18 mum; voltage 1.8 V; CMOS technology; Circuits; Clocks; Dynamic range; Filters; Jitter; Linearity; Noise reduction; Power dissipation; Quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC, 2009. ESSCIRC '09. Proceedings of

Conference_Location

Athens

ISSN

1930-8833

Print_ISBN

978-1-4244-4354-3

Type

conf

DOI

10.1109/ESSCIRC.2009.5325953

Filename

5325953