SCTF loop for noise reduction in Autozero amplifiers

G. Costa; N. Giménez; A. Arnaud; M. Miguez

doi:10.1049/el.2010.1456

SCTF loop for noise reduction in Autozero amplifiers

G. Costa, N. Giménez, A. Arnaud, M. Miguez

Department of Engineering

Universidad Católica del Uruguay

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The use of a lowpass switched continuous time filter (SCTF) in the noise cancellation loop of an Autozero amplifier to reduce the white noise aliasing effect at low frequencies is presented. The SCTF limits only the bandwidth of the sampled noise, not the bandwidth of the amplifier. Time domain simulations showing the effect of the SCTF-Autozero on both flicker and white noise are presented, as well as a designed low-noise electroencephalography (EEG) amplifier (DC - 150Hz) that takes advantage of the proposed technique for a 40 reduction of its input rms noise voltage.

Original language	English
Pages (from-to)	1256-1257
Number of pages	2
Journal	Electronics Letters
Volume	46
Issue number	18
DOIs	https://doi.org/10.1049/el.2010.1456
State	Published - 2 Sep 2010

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10.1049/el.2010.1456

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abstract = "The use of a lowpass switched continuous time filter (SCTF) in the noise cancellation loop of an Autozero amplifier to reduce the white noise aliasing effect at low frequencies is presented. The SCTF limits only the bandwidth of the sampled noise, not the bandwidth of the amplifier. Time domain simulations showing the effect of the SCTF-Autozero on both flicker and white noise are presented, as well as a designed low-noise electroencephalography (EEG) amplifier (DC - 150Hz) that takes advantage of the proposed technique for a 40 reduction of its input rms noise voltage.",

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AB - The use of a lowpass switched continuous time filter (SCTF) in the noise cancellation loop of an Autozero amplifier to reduce the white noise aliasing effect at low frequencies is presented. The SCTF limits only the bandwidth of the sampled noise, not the bandwidth of the amplifier. Time domain simulations showing the effect of the SCTF-Autozero on both flicker and white noise are presented, as well as a designed low-noise electroencephalography (EEG) amplifier (DC - 150Hz) that takes advantage of the proposed technique for a 40 reduction of its input rms noise voltage.

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SCTF loop for noise reduction in Autozero amplifiers

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