公开(公告)号：US10148231B2

公开(公告)日：2018-12-04

申请号：US15181523

申请日：2016-06-14

Applicant: Analogic Corporation

Inventor： Ahmed A. Hussein ,  Gerald A. Brimmer ,  Robert G. Haefner, Jr. ,  Matthew Hanlon

IPC: H03F1/56 ,  H03F3/19 ,  H03F3/21 ,  G01R33/36

Abstract: An apparatus includes an RF power amplifier with a controller and an impedance matching network. The RF power amplifier is configured to drive a load in electrical communication with the RF power amplifier. The impedance matching network is located electrically between the RF power amplifier and the load. The impedance matching network is configured to match an output impedance of the RF power amplifier and an impedance of the load. The impedance matching network includes a set of fixed value impedance matching circuits configured to provide different discrete values. The RF amplifier includes a variable DC power supply powering RF transistors to result in a variable output impedance for the amplifier. The controller selects an impedance matching circuit of the capacitor presets and/or the right setting for the variable DC supply that result in minimum reflected power to match the output impedance of the amplifier to the output load impedance.