IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
An exponent-scalable method for very small capacitance spread and large time constant of switched-capacitor integrator
Quan LiYan LiXiaosong WangXin LiuYu Liu
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2019 Volume 16 Issue 3 Pages 20181075

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Abstract

For switched-capacitor (SC) integrator, an exponent-scalable method to obtain very small capacitance spread and large time constant is presented. Based on Nagaraj-89 SC integrator, an additional SC feedback branch with an extra clock phase is employed, resulting in capacitance spread to the 3rd power in z-domain transfer function. Furthermore, with (N − 2) additional SC feedback branches using (N − 2) extra clock phases, capacitance spread to the Nth power can be achieved in z-domain transfer function. Compared with previous SC integrators, this proposed exponent-scalable method is analyzed, and it is verified by simulation that larger time constant can be realized with less capacitor area. Moreover, Monte-Carlo simulation shows low relative standard deviation of time constant is also maintained.

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© 2019 by The Institute of Electronics, Information and Communication Engineers
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