A Comparative Study on a SOI-CMOS Capacitive Feedback Op-Amp Using different Bias Circuits for High Temperature Application

Jeongwook Koh; Arasu, Muthukumaraswamy Annamalai; Minkyu Je
March 2012
International Proceedings of Computer Science & Information Tech;2012, Vol. 32, p142
Academic Journal
In this paper, we present comparative study on implementation of 1.0 um SOI-CMOS capacitive feedback op-amps using two different bias circuits, constant-gm bias and constant-current bias circuits for down-hole drilling application among high temperature electronics from 0 °C to 225 °C. Temperature dependence of leakage current and output resistance are investigated for high temperature operation of the op-amp and bias circuits. And the temperature dependence of open-loop ac characteristics of op-amps with two different bias circuits and the temperature dependence of closed-loop ac characteristics of capacitive feedback op-amp using these bias circuits are analyzed in this paper.


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