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Open AccessFeature PaperArticle

Open-Loop Switched-Capacitor Integrator for Low Voltage Applications

1
Department of innovation Engineering, University of Salento, 73100 Lecce, Italy
2
INTEL Austria GmbH, 8, 9524 Villach, Austria
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(5), 762; https://doi.org/10.3390/electronics9050762
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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