ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,562,689, issued on Feb. 24, was assigned to MURATA MANUFACTURING Co. LTD. (Kyoto, Japan).
"Amplifier unit" was invented by Yasutaka Sugimoto (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An amplifier unit includes an amplifier, a bias circuit, an inductor, a variable resistor circuit, and a control circuit. The amplifier includes an amplifier transistor that amplifies an input radio-frequency signal. The bias circuit is connected to the amplifier. The inductor is connected between and in series with the amplifier and the bias circuit. The variable resistor circuit is connected to the inductor. The control circuit includes a measuring circ...