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

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...

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Bibliographic Details
Published in2018 International Electrical Engineering Congress (iEECON) pp. 1 - 4
Main Authors Zaidi, Muhaned, Grout, Ian, Khari A'ain, Abu
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.03.2018
Subjects
Control systems
Frequency response
Gain
MOSFET
negative Miller compensation
programmable bandwidth
programmable gain
Resistance
tail current
Transconductance
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Summary: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.
DOI:10.1109/IEECON.2018.8712233