An improved 2 stage opamp with rail-to-rai! gain-boosted folded cascode input stage and monticelli rail-to-rail class AB output stage

Lida Kouhalvandi, Sercan Aygün, Ece Olcay Güneş, Mürvet Kirci

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

13 Citations (Scopus)

Abstract

This paper presents analysis and design of a two-stage CMOS operational amplifier (opamp) which consists of rail-to-rail gain-boosted folded cascode amplifier in order to enhance speed and DC gain from 68 dB to 123 dB in the input stage and also rail-to-rail class AB in output stage for maximizing signal-to-noise (SNR) ratio. It is simulated in 350nm CMOS technology in Cadence Spectre Circuit Simulator with 3.3 V power supply. This opamp achieves high DC gain of 156 dB and a phase margin of 69 degrees with a 5 pF load and minimum settling time of 22.3 ns while consuming power less than 7 mW along with a PSRR more than 90 dB. The overall result is the increased gain, reduced power consumption and fast high speed settling time. Therefore, the proposed opamp can be utilized in high speed and high-resolution Analog-to-Digital converters (ADCs) like pipeline ADC.

Original languageEnglish
Title of host publicationICECS 2017 - 24th IEEE International Conference on Electronics, Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages542-545
Number of pages4
ISBN (Electronic)9781538619117
DOIs
Publication statusPublished - 2 Jul 2017
Event24th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2017 - Batumi, Georgia
Duration: 5 Dec 20178 Dec 2017

Publication series

NameICECS 2017 - 24th IEEE International Conference on Electronics, Circuits and Systems
Volume2018-January

Conference

Conference24th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2017
Country/TerritoryGeorgia
CityBatumi
Period5/12/178/12/17

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

Keywords

  • ADC
  • Class AB amplifier
  • Folded cascode opamp
  • Gain boosted
  • Low voltage
  • Rail-to-rail

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