Low-voltage, micropower weak-inversion CMOS GM-C filter

Author

Hung, Chung-Chih ; Halonen, Kari ; Porra, Veikko ; Ismail, Mohammed

Author_Institution

Dept. of Electr. Eng., Helsinki Univ. of Technol., Espoo, Finland

Volume

2

fYear

1996

fDate

13-16 Oct 1996

Firstpage

1178

Abstract

In this paper, a CMOS implementation of a low-voltage, micropower 5th-order elliptic low-pass GM-C filter is presented. The Operational Transconductance Amplifier (OTA) in this GM-C filter design is implemented by a low-voltage voltage-to-current converter (V-I converter) working in the weak-inversion region. The transconductance can be tuned by control DC currents or DC voltage. This V-I converter can be used as a basic building block to construct low-voltage, micropower analog VLSI signal processing systems. Also, the filter provides a practical means for implementing very large time constants on-chip allowing single-chip solutions at very low frequencies. This 5th-order elliptic low-pass GM-C filter operates at a supply voltage of 3 V and has a tunable cutoff frequency from 140 Hz to 3.5 kHz

Keywords

CMOS analogue integrated circuits; active filters; circuit tuning; elliptic filters; low-pass filters; operational amplifiers; 140 Hz to 3.5 kHz; 3 V; 5th-order elliptic low-pass filter; CMOS GM-C filter; OTA; V-I converter; low-voltage micropower filter; operational transconductance amplifier; tunable cutoff frequency; voltage-to-current converter; weak-inversion region; Circuits; Cutoff frequency; Laboratories; Low pass filters; Operational amplifiers; Signal processing; Speech processing; Transconductance; Very large scale integration; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits, and Systems, 1996. ICECS '96., Proceedings of the Third IEEE International Conference on

Conference_Location

Rodos

Print_ISBN

0-7803-3650-X

Type

conf

DOI

10.1109/ICECS.1996.584634

Filename

584634