A New Current-Mode Synthesis Method for Dynamic Translinear Filters and its Applications in Hearing Instruments

Authors: Masmoudi D.¹; Serdijn W.A.²; Mulder J.²; Van Der Woerd A.C.²; Tomas J.³; Dom J.P.³

Source: Analog Integrated Circuits and Signal Processing, Volume 22, Numbers 2-3, March 2000 , pp. 221-229(9)

Publisher: Springer

Buy & download fulltext article:

Price: $47.00 plus tax (Refund Policy)

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 Volt. It has a power consumption of 5 W. 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: low voltage; low power; filter design; audiofrequency; dynamic translinear; subthreshold MOS; hearing instruments

Language: English

Document Type: Regular paper

Affiliations: 1: Bordeaux 1 University, I.X.L. Laboratory-UMR 5818, 351 cours de la libe´ration, 33405 Talence, France masmoudi@ixl.u-bordeaux.fr 2: Delft University of Technology, Faculty of Electrical Engineering, Mekelweg 4, 2628 CD Delft, The Netherlands 3: Bordeaux 1 University, I.X.L. Laboratory-UMR 5818, 351 cours de la libe´ration, 33405 Talence, France

Publication date: 2000-03-01