A new current mode synthesis method for dynamic translinear filters and its application in hearing aids

Author

Masmoudi, D. ; Serdijn, W. ; Mulder, J. ; Woerd, A. V D ; Tomas, J. ; Dom, J.P.

Author_Institution

IXL Lab., Bordeaux I Univ., Talence, France

Volume

2

fYear

1998

fDate

1998

Firstpage

337

Abstract

A new current mode synthesis method for dynamic translinear filters is proposed. As a design example, we have considered an ultra-low power second order filter working in audio frequency range, for hearing aids application, and using subthreshold MOS devices. It has a nominal supply voltage of 1.2 V and works down to 1 V. The total power consumption is about 5 μW. The filter cut-off frequency and its Q factor can be tuned respectively from 600 Hz to 13 kHz and from 0.6 to 1.1. Mismatch problems are investigated on the circuit level and an on-chip compensation method is proposed

Keywords

CMOS analogue integrated circuits; Q-factor; active filters; circuit tuning; compensation; current-mode circuits; hearing aids; low-pass filters; low-power electronics; network synthesis; state-space methods; 1 to 1.2 V; 5 muW; 600 Hz to 13 kHz; Q-factor tuning; audio frequency range; current mode synthesis method; cutoff frequency tuning; dynamic translinear filters; hearing aid application; mismatch problems; onchip compensation method; second order filter; subthreshold MOS devices; ultra-low power filter; Auditory system; Capacitance; Circuit synthesis; Electrical engineering; Hearing aids; Information filtering; Information filters; Laboratories; Low voltage; MOS devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1998 IEEE International Conference on

Conference_Location

Lisboa

Print_ISBN

0-7803-5008-1

Type

conf

DOI

10.1109/ICECS.1998.814894

Filename

814894