A Comparitive Study of On-Chip Clock Generators Using a-IGZO TFTs for Flexible Electronic Systems

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Abstract

This paper presents a comparitive study of ring oscillators (RO) using amorphous Indium Gallium Zinc Oxide (a-IGZO) thin-film transistors (TFTs) to implement on-chip clock generator for flexible electronic systems. A five-stage RO has been implemented with different inverter topologies using IGZO TFTs, which includes Diode connected load, Capacitive bootstrapping (BS), Pseudo-CMOS and Pseudo-CMOS bootstrapping architectures. These topologies have been simulated using in-house IGZO TFT models under similar conditions using different power supplies (10 V, 15 V and 20 V) in cadence environment. Among all architechtures Capacitive bootstrapping RO has ensured highest frequency of operation in the order of MHz and an output swing of 82% of V DD . Whereas, Pseudo-CMOS based RO provides the lowest power consumption in the order of μW with an output swing of 57% of V DD . On the other hand, the combination of Pseudo CMOS and bootstrapping has ensured highest voltage swing of 95% of V DD . In terms of power delay product (PDP) BS RO is superior with respect to other topologies. This work provides a clear insight to the designer to choose a particular topology for given application, mainly for on-chip clock generation for flexible electronic systems based on the requirements.

Original languageEnglish
Title of host publication2018 International Flexible Electronics Technology Conference, IFETC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538633571
DOIs
Publication statusPublished - 19 Dec 2018
Event2018 International Flexible Electronics Technology Conference, IFETC 2018 - Ottawa, Canada
Duration: 7 Aug 20189 Aug 2018

Conference

Conference2018 International Flexible Electronics Technology Conference, IFETC 2018
CountryCanada
CityOttawa
Period7/08/189/08/18

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Keywords

  • A-IGZO TFTs
  • Bootstrapping
  • Flexible on-chip clock generator
  • Pseudo-CMOS
  • Ring Oscillator

Cite this

Wadhwa, N., Martins, J., Bahubalindruni, P., Deb, S., & Barquinha, P. (2018). A Comparitive Study of On-Chip Clock Generators Using a-IGZO TFTs for Flexible Electronic Systems. In 2018 International Flexible Electronics Technology Conference, IFETC 2018 [8583926] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IFETC.2018.8583926