Design and Performance Analysis of a Digitally Programmable Op-Amp

In this paper, the design and simulated response of a digitally programmable operational amplifier (op-amp) is discussed. The purpose of this programming capability is to allow for the op-amp DC gain and frequency response to be controlled. This is attained by programming the transistor tail current...

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Bibliographic Details
Published in2018 International Conference on Intelligent and Advanced System (ICIAS) pp. 1 - 6
Main Authors Zaidi, Muhaned, Grout, Ian, A'ain, Abu Khari
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2018
Subjects
Capacitors
Circuit stability
Electronic circuits
Field programmable analog arrays
Power supplies
Transistors
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Summary:In this paper, the design and simulated response of a digitally programmable operational amplifier (op-amp) is discussed. The purpose of this programming capability is to allow for the op-amp DC gain and frequency response to be controlled. This is attained by programming the transistor tail current in the differential input stage of the op-amp operating at an analog power supply voltage of +3.3 V. Serial peripheral interface (SPI) communications is used here to provide control of the op-amp from an external digital host processor. The design is considered as a particular implementation of digital control of analog circuits. Examples of such digital control strategies of analog circuits are identified to create a context for this work before discussing and analyzing the op-amp design of concern.
DOI:10.1109/ICIAS.2018.8540621