A Voltage Controlled Oscillator Using IGZO Thin-Film Transistors

Tejaswini Keragodu, Bhawna Tiwari, Nishtha, Pydi Bahubalindruni, Joao Goes, Pedro Barquinha

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

2 Citations (Scopus)
19 Downloads (Pure)

Abstract

This paper presents a voltage controlled oscillator (VCO) using amorphous Indium Gallium Zinc Oxide (a-IGZO) thin-film transistors (TFTs). This circuit consists of a high-gain OpAmp, a comparator and a relaxation oscillator. The implemented relaxation oscillator shows a power consumption of 700 μW, when it is simulated with a supply rail of ±5 V. It shows a frequency of oscillation range from 327 to 560 Hz, when the tuning capacitance value varies from 1.6 to 5 pF. On the other hand, the VCO has a power dissipation of 1.3 mW with frequency ranging from 400 to 556 Hz with a controlling voltage from -5 to 5 V. In-house oxide TFT model is used for circuit simulations in Cadence environment. This circuit finds potential applications in large-area flexible systems, namely smart packaging, biomedical and wearable systems, which needs clocks with different frequencies.

Original languageEnglish
Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2018-May
ISBN (Electronic)978-1-5386-4881-0
DOIs
Publication statusPublished - 26 Apr 2018
Event2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence, Italy
Duration: 27 May 201830 May 2018

Conference

Conference2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
CountryItaly
CityFlorence
Period27/05/1830/05/18

Keywords

  • a-IGZO TFTs
  • comparator with oxide TFTs
  • positive feedback operational amplifier
  • Relaxation Oscillator
  • Voltage Controlled Oscillator

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  • Cite this

    Keragodu, T., Tiwari, B., Nishtha, Bahubalindruni, P., Goes, J., & Barquinha, P. (2018). A Voltage Controlled Oscillator Using IGZO Thin-Film Transistors. In 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings (Vol. 2018-May). [8351175] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS.2018.8351175