Title :
All-MOS subthreshold log filters
Author :
Graells, Francisco Serra
Author_Institution :
Centro Nacional de Microelectron., Bellaterra, Spain
Abstract :
This article proposes the use of nonlinear capacitors for log filtering thanks to the inner voltage dynamic range compression. The generalized principle is presented and an NMOS implementation for the capacitive element is proposed, which is compatible with existing low-voltage CMOS basic building blocks. The resulting all-MOS circuit technique is suitable to integrate such companding processing in digital VLSI technologies. Two examples for hearing aid circuits (i.e. 1 V supply) are given as demonstrators
Keywords :
CMOS analogue integrated circuits; active filters; analogue processing circuits; compandors; data compression; hearing aids; low-power electronics; 1 V; NMOS implementation; companding processing; digital VLSI technologies; hearing aid circuits; inner voltage dynamic range compression; log filtering; low-voltage CMOS basic building blocks; Auditory system; CMOS technology; Capacitors; Circuits; Dynamic range; Filtering; Filters; MOS devices; Very large scale integration; Voltage;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921807
