Title :
A Gm-C bump equalizer for low-voltage low-power applications
Author :
Galembeck, R. ; De Lima, J.A. ; Schneider, M.C.
Author_Institution :
Univ. Fed. de Santa Catarina, Florianopolis, Brazil
Abstract :
A low-voltage low-power 2nd-order CMOS pseudo-differential bump-equalizer is presented. Its topology comprises a bandpass section with adjustable center frequency and quality factor, together with a programmable current amplifier. The basic building blocks are triode-operating transconductors, tunable by means of either a DC voltage or a digitally controlled current divider. The bump-equalizer as part of a battery-operated hearing aid device is designed for a 1.4V-supply and a 0.35μm CMOS fabrication process. The circuit performance is supported by a set of simulation results, which indicates a center frequency from 600Hz to 2.4kHz, 1 ≤ Q ≤ 5, and an adjustable gain within ±6dB at center frequency. The filter dynamic range lies around 40dB. Quiescent consumption is kept below 12μW for any configuration of the filter.
Keywords :
CMOS analogue integrated circuits; current mirrors; equalisers; filters; low-power electronics; programmable circuits; 0.35 micron; 0.6 to 2.4 kHz; 1.4 V; CMOS fabrication process; CMOS pseudodifferential bump equalizer; DC voltage; Gm-C bump equalizer; adjustable center frequency; bandpass section; battery-operated hearing aid device; digitally controlled current divider; programmable current amplifier; quality factor; triode-operating transconductors; Auditory system; CMOS process; Digital control; Equalizers; Frequency; Q factor; Topology; Transconductors; Tunable circuits and devices; Voltage control;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328315
