High speed operational amplifier using a-InGaZnO TFTs with negative capacitance

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2 Citations (Scopus)

Abstract

This paper presents a novel high speed operational amplifier using a-IGZO TFTs for a given technology, without changing device structure, processing conditions and materials. In the proposed design, a negative capacitance generator (NCG) is employed, using a-IGZO TFTs, which is connected to the output of a positive feedback operational amplifier. This technique helps to move the output pole of the amplifier to very high frequency by reducing the overall equivalent capacitance (Ceq) at the output node, as the negative capacitance is in parallel with Ceq. By using this technique, the unity gain bandwidth (GB) of the opamp is increased from 486 kHz to 1.474 MHz without compromising other performance metrics, such as, gain and stability (phase margin). However power consumption is increased from 0.3 mW to 0.6 mW, when the simulations took place with in-house IGZO TFT models. Both NCG and the amplifier were designed with a minimum feature size of 10 µm and a power supply of 10 V and 15 V, respectively.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728133201
Publication statusPublished - 2020
Event52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Virtual, Online
Duration: 10 Oct 202021 Oct 2020

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2020-October
ISSN (Print)0271-4310

Conference

Conference52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020
CityVirtual, Online
Period10/10/2021/10/20

Keywords

  • A-IGZO TFT
  • Bandwidth enhancement
  • Negative capacitance
  • Positive feedback amplifier

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