Patent ID: 9035702
Filing Date: 2015-05-19
Classification: H01L,H03F

Abstract:
1. A microwave semiconductor amplifier with an output terminal connected to an external load, the amplifier having a prescribed frequency band, comprising: a semiconductor amplifying element including an input electrode and an output electrode and having a capacitive output impedance in the frequency band; an input matching circuit connected to the input electrode; and an output matching circuit including a bonding wire and a first transmission line, the bonding wire including a first end portion and a second end portion on an opposite side of the first end portion, the first end portion being connected to the output electrode, the second end portion being connected to one end portion of the first transmission line, a fundamental impedance and a second harmonic impedance seen toward the external load changing toward the one end portion of the first transmission line, the second harmonic impedance at the one end portion of the first transmission line having an inductive reactance within a frequency range of double a lower limit frequency of the frequency band to double an upper limit frequency of the frequency band, the output matching circuit matching the capacitive output impedance of the semiconductor amplifying element to the fundamental impedance of the external load.