skip to main content
10.1145/1081081.1081093acmconferencesArticle/Chapter ViewAbstractPublication PagessbcciConference Proceedingsconference-collections
Article

On the design of very small transconductance OTAs with reduced input offset

Published: 04 September 2005 Publication History

Abstract

In this paper it will be demonstrated, from the theory and measurements, that series-parallel (SP) mirrors allow building current copiers with copy factors of thousands, without degrading mismatch or noise performance. SP current-division will be then employed to design OTAs ranging from a few pS to a few nS, with up to 1V linear range, consuming in the order of 100nW, and with a reduced area. An integrated 3.3s time-constant integrator will also be presented. One-by-one several design non-idealities will be revised: linearity, offset, noise, leakages; as well as layout techniques. A final analysis concludes that SP-association of transistors allows to build very efficient transconductors, for demanding applications in the field of implantable electronics among others.

References

[1]
A.Veeravalli, E.Sánchez-Sinencio, J.Silva-Martínez, "Transconductance Amplifiers with Very Small Transconductances: A Comparative Design Approach", IEEE JSSC, vol.37, n°.6, pp.770--775, Jun.2002.
[2]
R.Rieger, A.Demosthenous, J.Taylor, "A 230-nW 10-s Time Constant CMOS Integrator for an Adaptive Nerve Signal Amplifier",IEEE-JSSC, v.39, n°11, pp.1968--1975, Nov.2004.
[3]
A.Arnaud, C.Galup-Montoro, "A Fully Integrated Physical Activity Sensing Circuit for Implantable Pacemakers", Integrated Circuits and Systems Design, SBCCI 2004, 7-11 Sept. 2004, pp.151--156.
[4]
R.Sarpeshkar, R.F.Lyon, C.Mead, "A Low-Power Wide-Linear-Range Transconductance Amplifier", An. Int. Circ.& Signal Proc., vol.13, pp.123--151 - 1997.
[5]
J.Silva-Martínez, J.Salcedo-Suner, "IC Voltage to Current Transducers with Very Small Transconductance", Analog Int. Circuits & Signal Processing vol.13, pp. 285--293, 1997.
[6]
C.D.Salthouse, R.Sarpeshkar, "A Practical Micropower Programmable Bandpass Filter for use in Bionic Ears", IEEE JSSC, Vol.38,n°1,pp.63--70, Jan.2003.
[7]
B.Linares-Barranco, T. Serrano-Gotarredona, "On the design and characterization of Femtoampere current-mode circuits", IEEE JSSC, vol. 38, n°.8, pp.1353--1363, August 2003.
[8]
F. Krummenacher; N. Joehl, "A 4-Mhz CMOS continuous-time filter with on-chip automatic tuning", IEEE JSSC, vol.23, no.3, pp750--758, June 1988.
[9]
P.Kinget, M.Steyaert, J.Van der Spiegel, "Full analog CMOS integration of very large time constants for synaptic transfer in neural networks", An. Int. Circ.& Signal Proc. vol.2, n°°4, pp. 281--295, 1992.
[10]
A.Arnaud, C.Galup-Montoro, "Pico-A/V range CMOS transconductors using series-parallel current division", Electronics Letters, v. 39, n°18, p.1295--1296, Sep.2003.
[11]
A. I. A. Cunha, M. C. Schneider, C. Galup-Montoro, "An MOS transistor model for analog circuit design", IEEE JSSC, vol.33, n°10, pp.1510--1519, Oct.1998.
[12]
M.J.M. Pelgrom, A.C.J. Duinmaijer, and A.P.G. Welbers, "Matching properties of MOS transistors", IEEE JSSC, vol. 24, no. 5, pp. 1433--1440, Oct. 1989.
[13]
C.Galup-Montoro, M.C.Schneider, I.Loss, "Series-parallel association of FET's for high gain and high frequency applications",IEEE-JSSC,v.29, n°9, pp.1094--1101, Sep 1994.
[14]
A.Arnaud, C.Galup Montoro, "Consistent noise models for analysis and design of CMOS circuits", IEEE Trans.Circuits & Systems I, Vol.51, n°°10, pp.1909--1915, Oct.2004.
[15]
A.Veeravalli, E.Sanchez-Sinencio, J.Silva-Martínez, "A CMOS Transconductance Amplifier Architecture With Wide Tunning Range for Very Low Frequency Applications", IEEE JSSC, vol.37, n°.6, pp.776--781, Jun.2002.

Cited By

View all
  • (2006)Bias circuit design for low-voltage cascode transistorsProceedings of the 19th annual symposium on Integrated circuits and systems design10.1145/1150343.1150372(94-97)Online publication date: 28-Aug-2006

Index Terms

  1. On the design of very small transconductance OTAs with reduced input offset

      Recommendations

      Comments

      Information & Contributors

      Information

      Published In

      cover image ACM Conferences
      SBCCI '05: Proceedings of the 18th annual symposium on Integrated circuits and system design
      September 2005
      271 pages
      ISBN:1595931740
      DOI:10.1145/1081081
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

      Sponsors

      Publisher

      Association for Computing Machinery

      New York, NY, United States

      Publication History

      Published: 04 September 2005

      Permissions

      Request permissions for this article.

      Check for updates

      Author Tags

      1. CMOS
      2. analog design
      3. low-power

      Qualifiers

      • Article

      Conference

      SBCCI05
      Sponsor:
      SBCCI05: 18th Symposium on Integrated Circuits and System Design
      September 4 - 7, 2005
      Florianolpolis, Brazil

      Acceptance Rates

      Overall Acceptance Rate 133 of 347 submissions, 38%

      Contributors

      Other Metrics

      Bibliometrics & Citations

      Bibliometrics

      Article Metrics

      • Downloads (Last 12 months)0
      • Downloads (Last 6 weeks)0
      Reflects downloads up to 16 Feb 2025

      Other Metrics

      Citations

      Cited By

      View all
      • (2006)Bias circuit design for low-voltage cascode transistorsProceedings of the 19th annual symposium on Integrated circuits and systems design10.1145/1150343.1150372(94-97)Online publication date: 28-Aug-2006

      View Options

      Login options

      View options

      PDF

      View or Download as a PDF file.

      PDF

      eReader

      View online with eReader.

      eReader

      Figures

      Tables

      Media

      Share

      Share

      Share this Publication link

      Share on social media