A low-voltage CMOS filter for hearing aids using dynamic gate biasing

Author

Pylarinos, L. ; Wong, N.W. ; Phang, K.

Author_Institution

Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada

Volume

1

fYear

2001

fDate

2001

Firstpage

183

Abstract

In this paper we discuss the design of a low-voltage (1.5 V), continuous-time, biquadratic CMOS filter based on dynamic gate biasing (DGB), We begin by discussing the filter´s structure and its tuning mechanism. The filter uses transconductance-C cells and implements low-pass, bandpass and high-pass transfer functions. The transconductances are tuned using the gate voltages of MOSFETs operating in the triode region. We review the principle of DGB, and discuss the design of the charge pump based on the filter´s performance and tunability requirements. Circuit details of the filter elements and the charge pump are presented along with SPICE simulation results of the overall filter

Keywords

CMOS analogue integrated circuits; SPICE; band-pass filters; biomedical electronics; biquadratic filters; circuit simulation; circuit tuning; continuous time filters; hearing aids; high-pass filters; low-pass filters; programmable filters; transfer functions; 0.35 micron; 1.5 V; DGB; MOSFET; SPICE simulation; bandpass transfer functions; charge pump; circuit details; continuous-time biquadratic CMOS filter; dynamic gate biasing; filter structure; gate voltages; hearing aids; high-pass transfer functions; low-pass transfer function; low-voltage CMOS filter; transconductance-C cells; triode region; tunability; tuning mechanism; Band pass filters; Batteries; CMOS technology; Charge pumps; Circuits; Hearing aids; MOSFETs; SPICE; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2001. Canadian Conference on

Conference_Location

Toronto, Ont.

ISSN

0840-7789

Print_ISBN

0-7803-6715-4

Type

conf

DOI

10.1109/CCECE.2001.933680

Filename

933680