An inverted three-stage Doherty amplifier is disclosed. The amplifier provides an input power divider, a carrier amplifier, two peak amplifiers, and an output combiner. The output combiner includes five quarter-wavelength (λ/4) lines, three of which correspond to the three amplifiers, one of which combines an output of the carrier amplifier with an output of the first peak amplifier, and the last of which combines the combined output of the carrier amplifier and the first peak amplifier with an output of the second peak amplifier. The five λ/4 lines have respective impedances to optionally adjust the output impedance of the respective amplifiers.