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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/).
(a) Schematic diagram of gate-source voltage of the transmit amplifier and (b) voltage regulator (LM2931C); Equivalent circuit models of gate-source DC bias voltage of (c) transmit amplifier only (d) and transmit amplifier with dual-bias high-voltage circuit.