Abstract: Included are: a first power source 3 configured to output a voltage required for a first gate bias voltage for turning a power amplifier 2 to an ON state; a second power source 4 configured to output a voltage required for a second gate bias voltage for turning the power amplifier 2 to an OFF state; a changeover switch 5 connected between the first power source 3 and the power amplifier 2 and configured to supply either the first gate bias voltage or the second gate bias voltage to the power amplifier 2 by switching a state between the first power source 3 and the power amplifier 2 to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the power amplifier 2; and a resistance value varying unit 15 connected between the second power source 4 and the power amplifier 2 and configured such that a resistance value thereof is variable.

Abstract: Included are: a first power source 3 configured to output a voltage required for a first gate bias voltage for turning a power amplifier 2 to an ON state; a second power source 4 configured to output a voltage required for a second gate bias voltage for turning the power amplifier 2 to an OFF state; a changeover switch 5 connected between the first power source 3 and the power amplifier 2 and configured to supply either the first gate bias voltage or the second gate bias voltage to the power amplifier 2 by switching a state between the first power source 3 and the power amplifier 2 to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the power amplifier 2; and a resistance value varying unit 15 connected between the second power source 4 and the power amplifier 2 and configured such that a resistance value thereof is variable.

Abstract: Included are: a first power source 3 configured to output a voltage required for a first gate bias voltage for turning a power amplifier 2 to an ON state; a second power source 4 configured to output a voltage required for a second gate bias voltage for turning the power amplifier 2 to an OFF state; a changeover switch 5 connected between the first power source 3 and the power amplifier 2 and configured to supply either the first gate bias voltage or the second gate bias voltage to the power amplifier 2 by switching a state between the first power source 3 and the power amplifier 2 to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the power amplifier 2; and a resistance value varying unit 15 connected between the second power source 4 and the power amplifier 2 and configured such that a resistance value thereof is variable.

Abstract: An amplification device includes: an amplifier that amplifies a signal having a fundamental frequency in a predetermined frequency band; an input harmonic processing circuit that is connected to an input side of the amplifier and performs input-side impedance matching at a harmonic frequency of the signal; and an output harmonic processing circuit that is connected to an output side of the amplifier and performs output-side impedance matching at a harmonic frequency of the signal. The input harmonic processing circuit is set so that the impedance matching is performed at the harmonic frequency when the fundamental frequency is a first frequency, the output harmonic processing circuit is set so that the impedance matching is performed at the harmonic frequency when the fundamental frequency is a second frequency, and the first frequency and the second frequency are frequencies different from each other.

Abstract: Included are: a first power source 3 configured to output a voltage required for a first gate bias voltage for turning a power amplifier 2 to an ON state; a second power source 4 configured to output a voltage required for a second gate bias voltage for turning the power amplifier 2 to an OFF state; a changeover switch 5 connected between the first power source 3 and the power amplifier 2 and configured to supply either the first gate bias voltage or the second gate bias voltage to the power amplifier 2 by switching a state between the first power source 3 and the power amplifier 2 to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the power amplifier 2; and a resistance value varying unit 15 connected between the second power source 4 and the power amplifier 2 and configured such that a resistance value thereof is variable.

Abstract: An electronic device includes a first transmission line, a second transmission line and a ground-coupling portion. The first transmission line is composed of a first signal line transmitting a given high frequency wave signal and a first ground. The second transmission line is composed of a second signal line transmitting the high frequency wave signal and a second ground. The ground-coupling portion couples the first ground and the second ground. A phase difference between the high frequency wave signals at both ends of the ground-coupling portion is substantially integral multiple of 180 degrees.

Abstract: An electronic device includes a first transmission line, a second transmission line and a ground-coupling portion. The first transmission line is composed of a first signal line transmitting a given high frequency wave signal and a first ground. The second transmission line is composed of a second signal line transmitting the high frequency wave signal and a second ground. The ground-coupling portion couples the first ground and the second ground. A phase difference between the high frequency wave signals at both ends of the ground-coupling portion is substantially integral multiple of 180 degrees.