Abstract: A balance-type amplifier includes: a signal divider circuit to divide an amplification target signal into first and second signals and output them; a first amplifier to amplify the first signal; a second amplifier to amplify the second signal; and a synthesis circuit to synthesize the amplified first signal and the amplified second signal. The first amplifier includes a first matching circuit to match an output impedance of the first amplifier with a first impedance different from an impedance of a load connected with an output side of the synthesis circuit. The second amplifier of the balance-type amplifier includes a second matching circuit to match an output impedance of the second amplifier with a second impedance different from the impedance of the load. One of the first and second impedances is higher than the impedance of the load, and another of them is lower than the impedance of the load.

Abstract: A high-frequency amplifier includes: a common-source transistor that has gate fingers, drain fingers, and source fingers, amplifies a signal applied to each of the gate fingers as a signal to be amplified, and outputs an amplified signal from each of the drain fingers; a common-gate transistor that has source fingers connected to the drain fingers of the common-source transistor, drain fingers, and gate fingers, and amplifies the amplified signal output from each of the drain fingers of the common-source transistor; a gate bus bar connected to the gate fingers of the common-gate transistor; and capacitors each having a first end connected to the gate bus bar and a second end grounded: wherein the capacitors are arranged at respective positions where impedances obtained by looking toward the respective capacitors from the respective gate fingers of the common-gate transistor are equal to each other.

Abstract: A charge sensor according to the present disclosed technology includes a quantum dot to have a first end connected to an input terminal via a first tunnel junction and a second end connected to an output terminal via a second tunnel junction, and an inductor connected in parallel to the quantum dot.

Abstract: Disclosed is a feedback amplifier including: an amplification transistor having a source terminal grounded; a first feedback circuit to provide negative feedback between the gate and drain terminals of the amplification transistor; a second feedback circuit to provide positive feedback between the gate and drain terminals via the first feedback circuit; and a third feedback circuit to adjust the stability factor of the feedback amplifier in a high frequency range outside a used frequency band.

Abstract: A charge sensor according to the present disclosed technology includes a quantum dot to have a first end connected to an input terminal via a first tunnel junction and a second end connected to an output terminal via a second tunnel junction, and an inductor connected in parallel to the quantum dot.

Abstract: A high-efficiency amplifier is configured so that short stubs are provided in a line between a first substrate end and a second substrate end of a substrate, and among the short stubs, short stubs provided at locations other than both ends of the line include two short stubs and which are adjacent to each other, and which are provided at locations at which the two short stubs are to be electromagnetically coupled to each other.

Abstract: CRLH lines including left-handed shunt inductors and left-handed series capacitors are provided on gate side transmission lines of a plurality of FETs.

Abstract: A high-frequency amplifier includes: a common-source transistor that has gate fingers, drain fingers, and source fingers, amplifies a signal applied to each of the gate fingers as a signal to be amplified, and outputs an amplified signal from each of the drain fingers; a common-gate transistor that has source fingers connected to the drain fingers of the common-source transistor, drain fingers, and gate fingers, and amplifies the amplified signal output from each of the drain fingers of the common-source transistor; a gate bus bar connected to the gate fingers of the common-gate transistor; and capacitors each having a first end connected to the gate bus bar and a second end grounded: wherein the capacitors are arranged at respective positions where impedances obtained by looking toward the respective capacitors from the respective gate fingers of the common-gate transistor are equal to each other.

Abstract: A high-efficiency amplifier is configured so that short stubs are provided in a line between a first substrate end and a second substrate end of a substrate, and among the short stubs, short stubs provided at locations other than both ends of the line include two short stubs and which are adjacent to each other, and which are provided at locations at which the two short stubs are to be electromagnetically coupled to each other.

Abstract: CRLH lines including left-handed shunt inductors and left-handed series capacitors are provided on gate side transmission lines of a plurality of FETs.

Abstract: A decoration member includes a base member having a design surface, and a film material that covers the design surface, wherein the base member has an edge portion that sharpens toward a tip portion when seen in a normal direction of the design surface, and a paste wall section on which the film material is able to be pasted while protruding away from the design surface is formed on a surface of the edge portion opposite to the design surface.

Abstract: A decoration member includes a base member having a design surface, and a film material that covers the design surface, wherein the base member has an edge portion that sharpens toward a tip portion when seen in a normal direction of the design surface, and a paste wall section on which the film material is able to be pasted while protruding away from the design surface is formed on a surface of the edge portion opposite to the design surface.