Patent ID: 7973600

Claim:
A power amplifier, comprising: at least one carrier amplifier; at least one peaking amplifier arranged in parallel with the carrier amplifier in such a manner that the carrier amplifier and the peaking amplifier collectively operate as a Doherty amplifier; a plurality of input matching circuits, at least one of which is respectively connected to the input ends of the carrier amplifier and the peaking amplifier; at least one impedance control circuit, each of which is connected to an output end of each carrier amplifier for controlling a load line impedance of said each carrier amplifier; at least one output matching circuit, in which an input end of the at least one output matching circuit is directly or indirectly connected to output ends of the impedance control circuit and the peaking amplifier; at least one offset line, each of which is connected between each peaking amplifier and the output matching circuit for transforming an output impedance of said each peaking amplifier to nearly open; and at least one first delay circuit, each of which is connected to an input end of one of the input matching circuits connected to the input end of the peaking amplifier for matching delays between the carrier amplifier and the peaking amplifier; wherein the output matching circuit utilizes, as a passive device, a bonding inductor used for connecting a module to a monolithic microwave integrated circuit (MMIC) chip in which the power amplifiers are embedded.