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Two-Stage Operational Amplifier Design by Using Direct and Indirect Feedback Compensations

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dc.contributor.authorZhang, Jiayuanen
dc.contributor.committeechairYi, Yangen
dc.contributor.committeememberJia, Xiaotingen
dc.contributor.committeememberLiu, Lingjiaen
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2021-06-22T08:00:31Zen
dc.date.available2021-06-22T08:00:31Zen
dc.date.issued2021-06-21en
dc.description.abstractThis paper states the stability requirements of the amplifier system, and then presents, and summarizes, the classic two stage CMOS Op-Amp design by employing several popular frequency compensation techniques including traditional Miller compensation, nulling resistor, voltage buffer, and current buffer. The advantages and disadvantages of all these compensation strategies are evaluated based on a standard performance which has a 70dB DC gain, a 60◦ phase margin, a 25MHz gain bandwidth, and a slew rate of 20 V/us requirements. All the designs and simulation results are based on a 180mm 1.8 V standard TSMC CMOS technology. Ultimately, the traditional Miller compensated Op-Amp (a single compensation capacitor amplifier) cannot meet all the requirements but all other techniques could with also a boost of performance in various aspects.en
dc.description.abstractgeneralTwo-stage CMOS operational amplifier has two input pins and one output pin. it is used to amplify the differential inputs signal and transfer it to the output side. Usually the input signals are too weak to be processed by the rest of the system units. So the Op-Amp can amplify the weak input signals which then can either be further modified for some specific applications by the rest units of the system or be the final output of this entire system. The role of the Op-Amp in analog and digital systems is as the role of transformers in the power system. So the output signal is required to have fast and stable responses to the inputs. This paper states some standard requirements of the Op-Amp in aspects of gain, stability, and operating frequency. Due to the classic design of two-stage Op-Amp has poor performance of stability and operating frequency, some compensation techniques are applied as the feedback networks to improve its performance. These techniques include traditional Miller compensation, nulling resistor, voltage buffer, and current buffer. The advantages and disadvantages of all these compensation strategies are evaluated based on a 180mm 1.8 V standard TSMC CMOS technology.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:31547en
dc.identifier.urihttp://hdl.handle.net/10919/103938en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectOp-Ampen
dc.subjectCMOSen
dc.subjectMiller Compensationen
dc.titleTwo-Stage Operational Amplifier Design by Using Direct and Indirect Feedback Compensationsen
dc.typeThesisen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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