A High Speed Programmable Ring Oscillator Using InGaZnO Thin-Film Transistors

Bhawna Tiwari, Jorge Martins, Shivam Kalla, Shashwat Kaushik, Ana Santa, Pydi Ganga Bahubalindruni, Vitor Grade Tavares, Pedro Barquinha

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

2 Citations (Scopus)
18 Downloads (Pure)

Abstract

This paper presents a high speed digitally programmable Ring Oscillator (RO) using Indium-gallium-zinc oxide thin-film transistors (IGZO TFTs). Proposed circuit ensures high speed compared to the conventional ROs using negative skewed scheme, in which each inverter delay is reduced by pre-maturely switching on/off the transistors. In addition, by controlling the load capacitance of each inverter through digital control bits, a programmable frequency of oscillation was attained. Proposed RO performance is compared with two conventional designs under same conditions. From simulation, it has been observed that the proposed circuit has shown a higher frequency of oscillations (283 KHz) compared to the conventional designs (76.52 KHz and 144.9 KHz) under same conditions. Due to the programmable feature, the circuit is able to generate 8 different linearly spaced frequencies ranging from 241.2 KHz to 283 KHz depending upon three digital control bits with almost rail-to-rail voltage swing. The circuit is a potential on-chip clock generator in many real-world flexible systems, such as, smart packaging, wearable devices, RFIDs and displays that need multi frequencies.

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

Keywords

  • High speed programmable RO
  • Negative skewed and rail-to-rail logic
  • Oxide TFTs

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