Bootstrapping circuit with IGZO TFTs for on-chip power supply generation

Nishtha Wadhwa, Pydi Ganga Bahubalindruni, Sujay Deb, Pedro Barquinha

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

Abstract

This paper reports a novel bootstrapping circuit with IGZO TFTs to generate on-chip power supply, mainly for real-time flexible wearable continuous health monitoring system. In order to ensure a compact and reliable system without complex external connections, on-chip power supply is required, to drive biological signal processing or conditioning circuits with IGZO TFTs. Though, integrated system (circuits with oxide TFTs and thin film batteries) can be achieved with printing technique, with the state of art, commercially available thin film printed batteries are confined to 3 V. Typically, flexible electronics with IGZO TFTs needs a power supply > 5 V (depending on the dielectric). The proposed bootstrapping (BS) circuit with IGZO TFTs can generate 2*VDD and 3*VDD with the printed batteries output voltage of around 3 V. The proposed circuit is tested with an input voltage spanning between 2 to 10 V and clock frequency up to 1 MHz. When the input voltage is 3 V with the load of 5 MO and 2 MO, the output which is acquired is 7.9 V and 6.4 V, respectively, with the respective power dissipation of 24.9 µW and 50.8 µW. The circuit simulations are carried out using IGZO TFT model in cadence virtuoso environment, which demonstrate that the BS circuit plays a vital role in the on-chip supply generation for wearable biomedical systems.

Original languageEnglish
Title of host publication2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728103976
DOIs
Publication statusPublished - 2019
Event2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019 - Sapporo, Japan
Duration: 26 May 201929 May 2019

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2019-May
ISSN (Print)0271-4310

Conference

Conference2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019
CountryJapan
CitySapporo
Period26/05/1929/05/19

Keywords

  • A-IGZO TFTs
  • Bootstrap circuit
  • Flexible Wearable health monitoring

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