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Open AccessFeature PaperArticle

Open-Loop Switched-Capacitor Integrator for Low Voltage Applications

Department of innovation Engineering, University of Salento, 73100 Lecce, Italy
INTEL Austria GmbH, 8, 9524 Villach, Austria
Author to whom correspondence should be addressed.
Electronics 2020, 9(5), 762;
Received: 13 March 2020 / Revised: 27 April 2020 / Accepted: 28 April 2020 / Published: 6 May 2020
(This article belongs to the Special Issue Filter Design Solutions for RF systems)
An architecture of a switched-capacitor integrator that includes a charge buffer operating in an open-loop is hereby proposed. As for the switched-capacitor filters, the gain of the proposed integrator, which is given by the input/output capacitor ratio, ensures desensitization to process, voltage, and temperature variations. The proposed circuit is suitable for low voltage supplies. It enables a significant power saving compared to a traditional switched-capacitor integrator. This was demonstrated through an analytical comparison between the proposed integrator and a traditional switched-capacitor integrator. The mathematical results were supported and verified by simulations performed on a circuit prototype designed in 16 nm finFET technology with 0.95 V supply. The proposed switched-capacitor integrator consumes 76 µW, resulting in more than twice the efficiency for the traditional closed-loop switched-capacitor filter as an input voltage equal to 31.25 mV at 7 ns clock period is considered. The comparison of architectures was led among the proposed integrator and the state-of-the-art technology in terms of the figure of merit. View Full-Text
Keywords: switched-capacitor filters; low-voltage; finFET switched-capacitor filters; low-voltage; finFET
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MDPI and ACS Style

D’Amico, S.; Marinaci, S.; Pridnig, P.; Bresciani, M. Open-Loop Switched-Capacitor Integrator for Low Voltage Applications. Electronics 2020, 9, 762.

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