Micropower CMOS GM-C filters for speech signal processing

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

19 Scopus citations

Abstract

In this paper, CMOS implementations of two low-voltage, micropower 5th-order elliptic low-pass GM-C filters are presented. Both of the 5th-order elliptic low-pass GM-C filters operate at a supply voltage of 3 V. Their tunable cutoff frequencies are from 3 Hz to 600 Hz and from 140 Hz to 3.5 KHz, respectively. The Operational Transconductance Amplifier (OTA) in these 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 DC currents or DC voltage. This V-I converter can also be used as a basic building block to construct low-voltage, micropower analog VLSI signal processing systems. These filters provide a practical means for implementing very large time constants on-chip allowing single-chip solutions at very low frequencies. They can be applied in speech processing systems and other very low frequency applications.

Original languageEnglish
Pages (from-to)1972-1975
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume3
DOIs
StatePublished - 1 Jan 1997
EventProceedings of the 1997 IEEE International Symposium on Circuits and Systems, ISCAS'97. Part 4 (of 4) - Hong Kong, Hong Kong
Duration: 9 Jun 199712 Jun 1997

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