Micropower CMOS GM-C filters for speech signal processing

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

doi:10.1109/ISCAS.1997.621539

Micropower CMOS GM-C filters for speech signal processing

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

^*Corresponding author for this work

Department of Electrical and Computer Engineering

Research output: Contribution to journal › Conference article › peer-review

21 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 language	English
Pages (from-to)	1972-1975
Number of pages	4
Journal	Proceedings - IEEE International Symposium on Circuits and Systems
Volume	3
DOIs	https://doi.org/10.1109/ISCAS.1997.621539
State	Published - 1 Jan 1997
Event	Proceedings of the 1997 IEEE International Symposium on Circuits and Systems, ISCAS'97. Part 4 (of 4) - Hong Kong, Hong Kong Duration: 9 Jun 1997 → 12 Jun 1997

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title = "Micropower CMOS GM-C filters for speech signal processing",

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.",

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AU - Halonen, Kari

AU - Ismail, Mohammed

AU - Porra, Veikko

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N2 - 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.

AB - 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.

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JO - Proceedings - IEEE International Symposium on Circuits and Systems

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Y2 - 9 June 1997 through 12 June 1997

ER -

Micropower CMOS GM-C filters for speech signal processing

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