A processing apparatus comprises: an integrated circuit; a power supply unit connected to an external power supply and configured to perform power supply to the integrated circuit; and a power switch configured to switch a state of the processing apparatus based on power supplied from the power supply unit. The integrated circuit comprises a control unit configured to control a power state of the integrated circuit in a state in which power supply to the integrated circuit is being performed by the power supply unit.

A digital circuit includes at least one quantum wire resonant tunneling transistor that includes an emitter terminal, a base terminal, a collector terminal, an emitter region in connection with the emitter terminal, a base region in connection with the base terminal, a collector region in connection with the collector terminal, an emitter barrier region between the emitter region and the base region, and a collector barrier region between the collector region and the base region. At least one of the emitter region, the base region, and the collector region includes a plurality of metal quantum wires.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A digital circuit includes at least one quantum wire resonant tunneling transistor that includes an emitter terminal, a base terminal, a collector terminal, an emitter region in connection with the emitter terminal, a base region in connection with the base terminal, a collector region in connection with the collector terminal, an emitter barrier region between the emitter region and the base region, and a collector barrier region between the collector region and the base region. At least one of the emitter region, the base region, and the collector region includes a plurality of metal quantum wires.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A power multiplexor includes: a first branch including a first transistor coupled in series with a second transistor between a first power supply and a power output; a second branch including a third transistor coupled in series with a fourth transistor between a second power supply and the power output; a controller configured to selectively assert and de-assert a control signal to the first branch and the second branch; a first voltage level shifter coupled between the second transistor and the controller; and a second voltage level shifter coupled between the third transistor and the controller.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A processing apparatus comprises: an integrated circuit; a power supply unit connected to an external power supply and configured to perform power supply to the integrated circuit; and a power switch configured to switch a state of the processing apparatus based on power supplied from the power supply unit. The integrated circuit comprises a control unit configured to control a power state of the integrated circuit in a state in which power supply to the integrated circuit is being performed by the power supply unit.