Title :
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
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;
Conference_Titel :
Electrical and Computer Engineering, 2001. Canadian Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-6715-4
DOI :
10.1109/CCECE.2001.933680
