Programmable Gain and Bandwidth Op-Amp Using Controllable Input Stage Tail Current

Muhaned Zaidi, Ian Grout, Abu Khari A'Ain

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

Abstract

This paper presents a novel technique to design a programmable open-loop DC gain and bandwidth single-ended output CMOS (complementary metal oxide semiconductor) opamp (operational amplifier) using a serial digital interface. The circuit topology allows for the programming of the differential input stage tail current. With this variable tail current, a controllable open-loop DC gain and frequency response is created that can be controlled from a host digital processor. The op-amp circuit has a rail-to-rail output where the first stage of the op-amp consists of differential input and folded-cascode circuits that are compensated using a negative Miller capacitor, and the second stage is a class-AB amplifier compensated by a conventional Miller capacitor. The op-amp has been designed using a 0.35\ \mu \mathrm{m} CMOS technology, its operation simulated using the Cadence Spectre simulator and operates on a single-rail +3.3V power supply.

Original languageEnglish
Title of host publicationiEECON 2018 - 6th International Electrical Engineering Congress
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538623176
DOIs
Publication statusPublished - 2 Jul 2018
Event6th International Electrical Engineering Congress, iEECON 2018 - Krabi, Thailand
Duration: 7 Mar 20189 Mar 2018

Publication series

NameiEECON 2018 - 6th International Electrical Engineering Congress

Conference

Conference6th International Electrical Engineering Congress, iEECON 2018
Country/TerritoryThailand
CityKrabi
Period7/03/189/03/18

Keywords

  • negative Miller compensation
  • programmable bandwidth
  • programmable gain
  • tail current

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