@inproceedings{9faf066752ef40b9841f4e14f5b539ff,
title = "Ultralow-power analog front-end circuits and system design for an implantable cardioverter defibrillator (ICD)",
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.",
keywords = "ICD, SAR ADC, VGA, analog front-end IC, gm-C filter, pre-amplifier, ultra-lowpower",
author = "Weibo Hu and Tam Nguyen and Liu, {Yen Ting} and Lie, {Donald Y.C.}",
year = "2011",
doi = "10.1109/LISSA.2011.5754148",
language = "English",
isbn = "9781457704208",
series = "Proceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011",
pages = "34--37",
booktitle = "Proceedings of the 2011 IEEE/NIH Life Science Systems and Applications Workshop, LiSSA 2011",
note = "null ; Conference date: 07-04-2011 Through 08-04-2011",
}