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. 2020 Nov 2;20(21):6244. doi: 10.3390/s20216244

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Equivalent circuit model of the first- and second-stage TVA circuits and (b) OVAI circuits and (c) MOSFET for AC analysis; (d) Impedance model concept of the OVAI circuit between the first- and second-stage TVA circuits.

(a) Equivalent circuit model of the first- and second-stage TVA circuits and (b) OVAI circuits and (c) MOSFET for AC analysis; (d) Impedance model concept of the OVAI circuit between the first- and second-stage TVA circuits.