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Bessel‐like compensation of three‐stage operational transconductance amplifiers
Author(s) -
Giustolisi Gianluca,
Palumbo Gaetano
Publication year - 2018
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2438
Subject(s) - bessel function , operational transconductance amplifier , amplifier , operational amplifier , frequency compensation , bessel filter , electronic engineering , transconductance , compensation (psychology) , filter (signal processing) , capacitor , electronic circuit , computer science , control theory (sociology) , engineering , cmos , electrical engineering , mathematics , physics , optics , voltage , transistor , psychoanalysis , gegenbauer polynomials , classical orthogonal polynomials , psychology , orthogonal polynomials , pure mathematics , artificial intelligence , control (management)
Abstract In this paper, we introduce a simple and well‐defined approach for the design of fast settling amplifiers suitable for switched‐capacitor circuits and characterized by low capacitive loads, in the order of few pico‐farad. In the specific, the design is based on a new Bessel‐like compensation that sets the phase of the closed‐loop amplifier to be linearly related to the frequency, thus emulating the behavior of an ideal delay, like in a Bessel filter. The proposed Bessel‐like approach is validated through the design and the simulation of two 3‐stage amplifiers in a 65‐nm CMOS process.