An analog correlator based CMOS analog front end with digital gain control circuit for hearing aid devices
- Authors
- Park, Hyusim; Jung, Sungyong; Chung, Hoon-Ju
- Issue Date
- Nov-2020
- Publisher
- SPRINGER
- Keywords
- Analog correlator; Variable gain amplifier; Gain control circuit; Piezoelectric microphone
- Citation
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, v.105, no.2, pp 157 - 165
- Pages
- 9
- Journal Title
- ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
- Volume
- 105
- Number
- 2
- Start Page
- 157
- End Page
- 165
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/25930
- DOI
- 10.1007/s10470-020-01680-3
- ISSN
- 0925-1030
1573-1979
- Abstract
- In this paper, an analog correlator based analog front end with gain control circuit for hearing aid devices is designed and fabricated with 0.18 mu m CMOS process. The proposed analog front end consists of an analog correlator comprised of a multiplier, an integrator, and a mixed mode variable gain amplifier. The analog correlator is utilized to ensure the low input referred noise. A gain control circuit is implemented in variable gain amplifier. Based on the output of piezoelectric micro-phone, designed gain control circuit automatically sets the gain. The investigated analog front end offers lower noise and wider dynamic range with compact size compared to conventional architecture. It achieves a 42 nV(rms) input referred noise and 84 dB signal to noise ratio. The total area of the designed analog front end circuit is 386 mu m x 569 mu m. Designed circuit is interfaced with a sensor model of piezoelectric microphone and its performance is successfully verified against simulation results.
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