A MEMS-Based Power-Scalable Hearing Aid Analog Front End

A MEMS-Based Power-Scalable Hearing Aid Analog Front End

A dual-channel directional digital hearing aid front end using microelectromechanical-systems microphones, and an adaptive-power analog processing signal chain are presented. The analog front end consists of a double differential amplifier-based capacitance-to-voltage conversion circuit, 40-dB varia...

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Veröffentlicht in:IEEE transactions on biomedical circuits and systems 2011-06, Vol.5 (3), p.201-213
Hauptverfasser: Deligoz, I, Naqvi, S R, Copani, T, Kiaei, S, Bakkaloglu, B, Sang-Soo Je, Junseok Chae
Format: Artikel
Sprache:eng
Schlagworte:
Acoustics
Amplification
Auditory system
Capacitance
Chains
Circuits
Continuous time sigma-delta modulation
digital hearing aids
directional microphone array
Dissipation
Gain
Hearing
Metal oxides
microelectromechanical-systems (MEMS) microphone
Micromechanical devices
Microphones
Noise
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Beschreibung
Zusammenfassung:A dual-channel directional digital hearing aid front end using microelectromechanical-systems microphones, and an adaptive-power analog processing signal chain are presented. The analog front end consists of a double differential amplifier-based capacitance-to-voltage conversion circuit, 40-dB variable gain amplifier (VGA) and a power-scalable continuous time sigma delta analog-to-digital converter (ADC), with 68-dB signal-to-noise ratio dissipating 67 μ W from a 1.2-V supply. The MEMS microphones are fabricated using a standard surface micromachining technology. The VGA and power-scalable ADC are fabricated on a 0.25-μ m complementary metal-oxide semciconductor TSMC process.
ISSN:1932-4545
1940-9990
DOI:10.1109/TBCAS.2010.2079329