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Dynamic-range analysis and maximization of micropower G[subscript m]-C bandpass filters by adaptive biasing

Authors :
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Sarpeshkar, Rahul
Arfin, Scott Kenneth
Mandal, Soumyajit
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Sarpeshkar, Rahul
Arfin, Scott Kenneth
Mandal, Soumyajit
Source :
IEEE
Publication Year :
2010

Abstract

We analyze and present an input gain-varying scheme for maximizing dynamic range in a well-known G[subscript m]-C bandpass filter by both minimizing noise for small input signals, and by achieving balanced swing levels at all filter nodes for large input signals. A micropower bandpass filter suitable for use in cochlear implants and other power-constrained biomedical applications was implemented and tested in subthreshold CMOS. At a center frequency of 1.4 kHz and quality factor of 4, the filter has 70 dB of dynamic range (57 dB maximum SNR, 2.5% total harmonic distortion (THD)) and consumes 2.55 muW of power.

Details

Database :
OAIster
Journal :
IEEE
Notes :
application/pdf, en_US
Publication Type :
Electronic Resource
Accession number :
edsoai.ocn656415582
Document Type :
Electronic Resource