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An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier

Title
An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier
Author
유창식
Keywords
CMOS; class-D amplifier; operational amplifier; hearing aid; sigma-delta modulator
Issue Date
2015-08
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Citation
IEICE ELECTRONICS EXPRESS, v. 12, NO 17, Page. 1-8
Abstract
To minimize the power consumption of an analog sigma-delta modulator (SDM), a fifth-order loop filter of the SDM has been realized with only three operational amplifiers (op-amp). The analog SDM with shared op-amp is applied to a class-D amplifier for a digital hearing aid. The class-D amplifier with the analog SDM has been realized in a standard 0.13-mu m CMOS process. The maximum output power level of the class-D amplifier is 1.13-mW for a load with 46.5-Omega DC resistance. The total harmonic distortion+noise (THD+N) and the dynamic range (DR) of the class-D amplifier are 0.0038-% and 96-dB, respectively. The fifth-order analog SDM with shared op-amp consumes only 0.2-mW from a 1.2-V power supply.
URI
https://www.jstage.jst.go.jp/article/elex/12/17/12_12.20150562/_articlehttp://hdl.handle.net/20.500.11754/27111
ISSN
1349-2543
DOI
10.1587/elex.12.20150562
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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