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Title of Journal: Analog Integr Circ Sig Process

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Abbravation: Analog Integrated Circuits and Signal Processing

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Springer US

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DOI

10.1016/1352-2310(95)90146-9

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1573-1979

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Lowpower operational transconductance amplifier w

Authors: Pablo PérezNicoli Francisco Veirano Pablo Castro Lisboa Fernando Silveira
Publish Date: 2016/08/17
Volume: 89, Issue: 3, Pages: 521-529
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Abstract

This paper presents a high slewrate operational transconductance amplifier OTA based on a nonlinear current mirror which dramatically reduces the quiescent current The proposed circuit achieves less quiescent current than previously proposed architectures since no additional bias branches are needed The compactness of the proposed architecture does not require so much silicon area as other more complex adaptive bias architectures The proposed technique is compared with previous state of the art high slewrate architectures Additionally this novel architecture was used to design a nonsymmetrical OTA which was part of the feedback loop of a switchedcapacitor DC–DC converter This OTA occupies 420 μm2 fabricated in a 130 nm technology Measurements results are presented showing that a slewrate enhancement from 15 to 535 mV/μs is achieved in an OTA biased with 50 nA and loaded with 50 pF

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