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A 154-mu W 80-dB SNDR analog-to-digital front-end for digital hearing aids

Title
A 154-mu W 80-dB SNDR analog-to-digital front-end for digital hearing aids
Author
박상규
Keywords
Analog front-end; Delta-sigma ADC; Preamplifier; Hearing aids
Issue Date
2016-11
Publisher
SPRINGER
Citation
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, v. 89, no. 2, Page. 383-393
Abstract
A low-power, low-noise analog-to-digital frontend for digital hearing aids consisting of a preamplifier and a delta-sigma (DS) ADC with a decimation filter is presented. The high-input-impedance preamplifier has a variable gain from 14 to 23 dB. The power consumption of the preamplifier is kept low by employing operational amplifiers with class-AB output and a capacitive anti-aliasing filter. The DS modulator employs a 4th order feed-forward topology with 6-level quantization to reduce the power consumption and distortion. The designed front-end has been implemented using a 130 nm CMOS process and achieved 82.1 dB SNR and 80.1 dB SNDR over a 7.5 kHz signal band, which satisfies the requirement for digital hearing aids. The total chip dissipates a power of 154 mu W from a 1.2 V supply.
URI
https://link.springer.com/article/10.1007%2Fs10470-016-0850-xhttp://repository.hanyang.ac.kr/handle/20.500.11754/101240
ISSN
0925-1030; 1573-1979
DOI
10.1007/s10470-016-0850-x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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