A low-power second-order double-sampling delta-sigma modulator for audio applications

Author

Junbo Shim ; Seong-Kwan Hong ; Oh-Kyong Kwon

Author_Institution

Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea

fYear

2014

fDate

22-25 June 2014

Firstpage

1

Lastpage

2

Abstract

This paper proposes a low-power double-sampling delta-sigma (ΔΣ) modulator for audio applications. The proposed modulator adopts a second-order cascade of integrators feedforward type and employs an adaptive current saving scheme for the low power operation. The adaptive current control logic senses the output transition of integrator and controls the bias current of operational transconductance amplifiers. The proposed ΔΣ modulator is fabricated using a 0.18-μm CMOS process. The measurement result shows that the power consumption of the proposed ΔΣ modulator is reduced from 2.57 mW to 1.93 mW without sacrificing the signal-to-noise ratio.

Keywords

CMOS integrated circuits; audio equipment; delta-sigma modulation; integrating circuits; low-power electronics; operational amplifiers; power consumption; ΔΣ modulator; CMOS; adaptive current control logic; adaptive current saving; audio; delta-sigma modulator; integrators; operational transconductance amplifiers; power 2.57 mW to 1.93 mW; power consumption; signal-to-noise ratio; size 0.18 mum; Current control; Current measurement; Feedforward neural networks; Modulation; Power demand; Power measurement; Signal to noise ratio; adaptive current control; analog-to-digital converter (ADC); cascade of integrators feedforward (CIFF); delta-sigma modulator; double-sampling; low-power;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics (ISCE 2014), The 18th IEEE International Symposium on

Conference_Location

JeJu Island

Type

conf

DOI

10.1109/ISCE.2014.6884465

Filename

6884465