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. 2020 Apr 16;20(8):2273. doi: 10.3390/s20082273

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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) Pulse-echo experiment of class-J power amplifier; (b) the output of the class-J power amplifier and expander; (c) the received discharged signal of the limiter after the transducer.