ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,489,406, issued on Dec. 2, was assigned to MURATA MANUFACTURING Co. LTD. (Kyoto, Japan).
"Power amplifier circuit" was invented by Kenichi Shimamoto (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power amplifier circuit includes first and second bias circuits to each apply a bias to first and second amplifiers in first and second modes, respectively. The first bias circuit includes: a first transistor having a collector connected to a power supply electric potential, an emitter connected to the first amplifier, and a base connected to a current source; and a second transistor and a third transistor being diode-connected and connected betw...