DOHERTY AMPLIFIER

摘要

A Doherty amplifier is provided to improve efficiency by using a different bias in a main amplifier and an auxiliary amplifier. A Doherty amplifier includes a first parallel capacitor(31), a second parallel capacitor(32), a transmission line unit(33b), and a matching network unit(35). A first parallel capacitor is connected in parallel to a main amplifier(10). The second parallel capacitor is connected in parallel to an auxiliary amplifier(20). The first and second parallel capacitors are grounded. The transmission line unit connects the main amplifier and the auxiliary amplifier. The transmission line unit is one of an inductor and a microstrip transmission line. The matching network unit is diverged between the second parallel capacitor and the transmission line unit.