Title :
Low-voltage programmable gm-C filter for hearing aids using dynamic gate biasing
Author :
Pylarinos, Louie ; Phang, Khoman
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada
Abstract :
This paper presents a low voltage programmable continuous-time filter for hearing aids. The filter uses an analog circuit technique employing on-chip charge pumps called dynamic gate biasing (DGB). A simple method for reducing the ripple from the DGB charge pumps is presented. The principle of DGB is experimentally verified through the implementation of a programmable gm-C biquadratic filter. Designed in 0.35 μm CMOS, the filter operates from 1.2 V and dissipates 16 μW, provides 62.3 dB dynamic range at -45 dB THD and can realize lowpass, bandpass and highpass filter responses.
Keywords :
CMOS analogue integrated circuits; band-pass filters; biquadratic filters; continuous time filters; harmonic distortion; hearing aids; high-pass filters; low-pass filters; low-power electronics; programmable filters; 0.35 micron; 1.2 V; 16 muW; CMOS; DGB; analog circuit; bandpass filter; biquadratic filter; continuous-time filter; dynamic gate biasing; hearing aids; highpass filter; low-voltage programmable gm-C filter; lowpass filter; on-chip charge pumps; reduced ripple; Charge pumps; Clocks; Filters; Hearing aids; Low voltage; MOSFETs; Threshold voltage; Transconductance; Transconductors; Tunable circuits and devices;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465004
