Design of low-frequency low-pass filters for biomedical applications

Chun Lung Hsu, Mean Horn Ho, Yu Kuan Wu, Ting Hsuan Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

29 Scopus citations

Abstract

This paper presents the design method of very low-frequency current-mode low-pass filters for biomedical applications. The double-output operational transconductance amplifiers and grounded capacitors (DO-OTA-Cs) are used to realize the proposed low-frequency low-pass filters. The theory focuses mainly on establishing a relationship between the cascaded DO-OTA-Cs and the multiple-loop feedback connections, which make the design formulas. For the implementation of large time constants of the proposed low-pass filters, both linearized DO-OTAs with reduced transconductance and impedance scaler scheme for grounded capacitors are employed. Physical chip design of a leapfrog low-frequency low-pass filter was fabricated by using TSMC 0.35-um 2P4M CMOS process. With an active area of 1240 um × 490 um and working at 1.5 V, the circuit dissipates about 96.5 nW and the -3 dB frequency is around 3.8 Hz. Also, the measurement results are presented to verify the theoretical analysis.

Original languageEnglish
Title of host publicationAPCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems
Pages690-695
Number of pages6
DOIs
StatePublished - 2006
EventAPCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems - , Singapore
Duration: 4 Dec 20066 Dec 2006

Publication series

NameIEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS

Conference

ConferenceAPCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems
Country/TerritorySingapore
Period4/12/066/12/06

Keywords

  • Current-mode
  • DO-OTA-C
  • Low-frequency
  • Low-pass filter

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