A 154-mu W 80-dB SNDR analog-to-digital front-end for digital hearing aids
- Authors
- Im, Saemin; Park, Sang-Gyu
- Issue Date
- Nov-2016
- Publisher
- SPRINGER
- Keywords
- Analog front-end; Delta-sigma ADC; Preamplifier; Hearing aids
- Citation
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, v.89, no.2, pp.383 - 393
- Indexed
- SCIE
SCOPUS
- Journal Title
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
- Volume
- 89
- Number
- 2
- Start Page
- 383
- End Page
- 393
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/21421
- DOI
- 10.1007/s10470-016-0850-x
- ISSN
- 0925-1030
- 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.
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