Abstract: A device analyzer for analyzing power devices. An example device analyzer comprises a collector supply to generate supply signal pulses with selected voltage or current levels and a supply signal pulse width at a high current. The supply signal pulses are applied at a collector supply source terminal when DUT is connected to conduct current between the collector supply source terminal and a collector supply common terminal. A supply switch closes or opens the DUT current path in narrow pulses having a narrow pulse width narrower than the supply signal pulses to conduct the supply signal pulses as narrowed sweep signal pulses having the high current capacity of the collector supply current. The supply switch alternatively regulates the current in the current path at constant current levels. Other modules capable of high power test capabilities may also be added.

Abstract: An amplifier which comprises an operational amplifier, a semiconductor switch that selectively connects at least one circuit to an input terminal of the operational amplifier, and a device for virtual shorting of both terminals of the semiconductor switch in an isolated state.

Abstract: A signal switching apparatus comprising multiple relays, multiple photocouplers, wherein an output from the photocouplers is connected to the coils of the multiple relays, and a control device that controls the photocouplers. The coils of the above-mentioned multiple relays are connected so that they are distributed between a positive electrical source and a negative electrical source so that the current flowing to the ground is small.

Abstract: An amplifier which comprises an operational amplifier, a semiconductor switch that selectively connects at least one circuit to an input terminal of the operational amplifier, and a device for virtual shorting of both terminals of the semiconductor switch in an isolated state.

Abstract: In order to reduce harmonic distortion, a track and hold circuit comprising a MOS transistor switch, a hold capacitor, and a voltage stabilizer for biasing bulk potential of the MOS transistor switch at a certain voltage is disclosed.

Abstract: A track and hold circuit includes a MOS transistor switch and a holding capacitor, and a bulk potential of the MOS transistor switch is changed in phase with an input signal in order to reduce harmonic distortions.

Abstract: In order to reduce harmonic distortion, a track and hold circuit comprising a MOS transistor switch, a hold capacitor, and a voltage stabilizer for biasing bulk potential of the MOS transistor switch at a certain voltage is disclosed.

Abstract: A track and hold circuit including a MOS transistor switch, a holding capacitor, and a bulk potential of the MOS transistor switch changed in phase with an input signal in order to reduce harmonic distortions.

Abstract: In order to reduce harmonic distortion, a track and hold circuit comprising a MOS transistor switch, a hold capacitor, and a voltage stabilizer for biasing bulk potential of the MOS transistor switch at a certain voltage is disclosed.