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Low-voltage programmable gm-C filter for hearing aids using dynamic gate biasing

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2 Author(s)
L. Pylarinos ; Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada ; Khoman Phang

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.

Published in:

2005 IEEE International Symposium on Circuits and Systems

Date of Conference:

23-26 May 2005