ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,489,409, issued on Dec. 2, was assigned to Mitsubishi Electric Corp. (Tokyo).
"Power amplifier" was invented by Kazuya Yamamoto (Tokyo) and Satoshi Suzuki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power amplifier includes a main transistor configured to amplify an input signal and having characteristics of a drain current delay, a replica transistor having the same characteristics of the drain current delay as the characteristics of the main transistor, a temperature of the replica transistor changing in accordance with a temperature of the main transistor, and an envelope signal of the input signal being input to the replica transistor, an...