A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters

A linearly tunable low-voltage CMOS transconductor featuring a new adaptative-bias mechanism that considerably improves the stability of the processed-signal common-mode voltage over the tuning range critical for very-low voltage applications is introduced. It embeds a feedback loop that holds input...

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Autores principales: De Lima, Jader, Dualibe, Fortunato Carlos Augusto
Formato: Artículo acceptedVersion
Lenguaje:Español
Publicado: 2001
Materias:
TK ingeniería eléctrica. Ingeniería electrónica nuclear
Acceso en línea:http://pa.bibdigital.ucc.edu.ar/3928/1/A_DeLima_Dualibe.pdf
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Producción Académica Universidad Católica de Córdoba (UCCor) de Universidad Católica de Córdoba
id I38-R144-3928
record_format dspace
spelling I38-R144-39282023-07-03T17:39:51Z http://pa.bibdigital.ucc.edu.ar/3928/ A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters De Lima, Jader Dualibe, Fortunato Carlos Augusto TK ingeniería eléctrica. Ingeniería electrónica nuclear A linearly tunable low-voltage CMOS transconductor featuring a new adaptative-bias mechanism that considerably improves the stability of the processed-signal common-mode voltage over the tuning range critical for very-low voltage applications is introduced. It embeds a feedback loop that holds input devices on triode region while boosting the output resistance. Analysis of the integrator frequency response gives an insight into the location of secondary poles and zeros as function of design parameters. A third-order low-pass Cauer filter employing the proposed transconductor was designed and integrated on a 0.8-/jm n-well CMOS standard process. For a 1.8-V supply filter characterization revealed fp = 0.93 MHz fs = 1.82 MHz Amin = 44.08 dB and Amax = 0.64 dB at nominal tuning. Tuned by a dc voltage VTUNE> the filter bandwidth was linearly adjusted at a rate of 11.48 kHz/mV over nearly one frequency decade. A maximum 13-mV deviation on the common-mode voltage at the filter output was measured over the interval 25 mV < VTUNE < 200 mV. For Vout = 300 mVpp and VTUNE = 100 mV THD was -55.4 dB. Noise spectral density was 0.84 V/Hz1/2 @1 kHz and S/N = 41 dB @Vout = 300 mVpp and 1-MHz bandwidth. Idle power consumption was 1.73 mW @VTUNE = 100 mV. A tradeoff between dynamic range bandwidth power consumption and chip area has then been achieved. 2001-07-31 application/pdf spa http://pa.bibdigital.ucc.edu.ar/3928/1/A_DeLima_Dualibe.pdf De Lima, Jader ORCID: https://orcid.org/0000-0001-6123-7771 <https://orcid.org/0000-0001-6123-7771> and Dualibe, Fortunato Carlos Augusto ORCID: https://orcid.org/0000-0002-2889-315X <https://orcid.org/0000-0002-2889-315X> (2001) A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters. IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 48 (7). pp. 649-660. ISSN 1057-7130 info:eu-repo/semantics/altIdentifier/doi/10.1109/82.958335 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/acceptedVersion Fil: De Lima, Jader. lectrical Engineering Department. Universidade Estadual Paulista; Brazil Fil: Dualibe, Fortunato Carlos Augusto. Universidad Católica de Córdoba. Facultad de Ingeniería; Argentina info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
institution Universidad Católica de Córdoba
institution_str I-38
repository_str R-144
collection Producción Académica Universidad Católica de Córdoba (UCCor)
language Español
orig_language_str_mv spa
topic TK ingeniería eléctrica. Ingeniería electrónica nuclear
spellingShingle TK ingeniería eléctrica. Ingeniería electrónica nuclear
De Lima, Jader
Dualibe, Fortunato Carlos Augusto
A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
topic_facet TK ingeniería eléctrica. Ingeniería electrónica nuclear
description A linearly tunable low-voltage CMOS transconductor featuring a new adaptative-bias mechanism that considerably improves the stability of the processed-signal common-mode voltage over the tuning range critical for very-low voltage applications is introduced. It embeds a feedback loop that holds input devices on triode region while boosting the output resistance. Analysis of the integrator frequency response gives an insight into the location of secondary poles and zeros as function of design parameters. A third-order low-pass Cauer filter employing the proposed transconductor was designed and integrated on a 0.8-/jm n-well CMOS standard process. For a 1.8-V supply filter characterization revealed fp = 0.93 MHz fs = 1.82 MHz Amin = 44.08 dB and Amax = 0.64 dB at nominal tuning. Tuned by a dc voltage VTUNE> the filter bandwidth was linearly adjusted at a rate of 11.48 kHz/mV over nearly one frequency decade. A maximum 13-mV deviation on the common-mode voltage at the filter output was measured over the interval 25 mV < VTUNE < 200 mV. For Vout = 300 mVpp and VTUNE = 100 mV THD was -55.4 dB. Noise spectral density was 0.84 V/Hz1/2 @1 kHz and S/N = 41 dB @Vout = 300 mVpp and 1-MHz bandwidth. Idle power consumption was 1.73 mW @VTUNE = 100 mV. A tradeoff between dynamic range bandwidth power consumption and chip area has then been achieved.
format Artículo
Artículo
acceptedVersion
author De Lima, Jader
Dualibe, Fortunato Carlos Augusto
author_facet De Lima, Jader
Dualibe, Fortunato Carlos Augusto
author_sort De Lima, Jader
title A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
title_short A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
title_full A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
title_fullStr A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
title_full_unstemmed A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to gm-C filters
title_sort linearly tunable low-voltage cmos transconductor with improved common-mode stability and its application to gm-c filters
publishDate 2001
url http://pa.bibdigital.ucc.edu.ar/3928/1/A_DeLima_Dualibe.pdf
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