Ultralow-power analog front-end circuits and system design for an implantable cardioverter defibrillator (ICD)

Weibo Hu, Tam Nguyen, Yen Ting Liu, Donald Y.C. Lie

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

This paper proposes some novel ultralow-power system and circuit designs and trade-offs on the analog front-end integrated circuit (IC) for an implantable cardioverter defibrillators (ICD). The major front-end analog IC components include low-power pre-amplifier, filters, a variable-gain-amplifier (VGA) and an Analog-to-Digital Converter (ADC). We avoided the use of clock signals in the analog IC design (except in the ADC) to reduce the common-mode and switching noise as much as possible. Therefore, the pre-amplifier is designed with low-noise bipolar transistors, rather than using chopper or auto-zero techniques; the filters are designed with the gm-C topology. The VGA includes a high-pass filter (HPF) and a DC shifter designed with a differential difference amplifier (DDA). An ultralow-power successive-approximation-register (SAR) ADC with a novel DAC design is used to digitize signals and to reduce SAR ADC's input capacitance by half. SPICE simulation results of each circuit block and of the entire front-end IC demonstrate that the ultralow-power analog front-end circuitry can effectively filter out the undesired T-wave in patients' electrogram (EGM) to enable proper heartbeat detection in the ICD.

Original languageEnglish
Title of host publicationProceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011
Pages34-37
Number of pages4
DOIs
StatePublished - 2011
Event2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011 - Bethesda, MD, United States
Duration: Apr 7 2011Apr 8 2011

Publication series

NameProceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011

Conference

Conference2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011
CountryUnited States
CityBethesda, MD
Period04/7/1104/8/11

Keywords

  • ICD
  • SAR ADC
  • VGA
  • analog front-end IC
  • gm-C filter
  • pre-amplifier
  • ultra-lowpower

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    Hu, W., Nguyen, T., Liu, Y. T., & Lie, D. Y. C. (2011). Ultralow-power analog front-end circuits and system design for an implantable cardioverter defibrillator (ICD). In Proceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011 (pp. 34-37). [5754148] (Proceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011). https://doi.org/10.1109/LISSA.2011.5754148