Abstract: A voltage source generates a power supply voltage VOUT stabilized such that it matches the voltage level that corresponds to a reference voltage VREF, and supplies the power supply voltage to a DUT. A current detection circuit generates a detection voltage Vm that corresponds to an output current IOUT that flows through the DUT. In the initial state, the reference voltage VREF generated by a reference voltage generating circuit is set to an initial voltage level that corresponds to an input voltage VIN. After the output current IOUT flows, the reference voltage transits to a first voltage level VL1 obtained by shifting the initial voltage level by a first voltage step that corresponds to the detection voltage Vm. Subsequently, the reference voltage VREF transits to a second voltage level VL2 obtained by shifting the initial voltage level by a second voltage step that corresponds to the detection voltage Vm.

Abstract: A voltage source generates a power supply voltage VOUT stabilized such that it matches the voltage level that corresponds to a reference voltage VREF, and supplies the power supply voltage to a DUT. A current detection circuit generates a detection voltage Vm that corresponds to an output current IOUT that flows through the DUT. In the initial state, the reference voltage VREF generated by a reference voltage generating circuit is set to an initial voltage level that corresponds to an input voltage VIN. After the output current IOUT flows, the reference voltage transits to a first voltage level VL1 obtained by shifting the initial voltage level by a first voltage step that corresponds to the detection voltage Vm. Subsequently, the reference voltage VREF transits to a second voltage level VL2 obtained by shifting the initial voltage level by a second voltage step that corresponds to the detection voltage Vm.

Abstract: Provided is a measurement apparatus that measures a current flowing through a load, including a power supply section that outputs a current supplied to the load; a current measuring section that measures a load current flowing between the load and the power supply section; a switch that is connected in parallel with the current measuring section between the load and the power supply section; and a control section that disconnects the switch during measurement of the load current and connects the switch when the load current falls outside of a predetermined reference range.

Abstract: Provided is a measurement apparatus that measures a current flowing through a load, including a power supply section that outputs a current supplied to the load; a current measuring section that measures a load current flowing between the load and the power supply section; a switch that is connected in parallel with the current measuring section between the load and the power supply section; and a control section that disconnects the switch during measurement of the load current and connects the switch when the load current falls outside of a predetermined reference range.

Abstract: There is provided a power amplifier circuit that applies an output voltage according to a given input voltage to a load, the power amplifier circuit includes an amplifying section of which an output port is connected to the load and that outputs the output voltage according to the input voltage, a source-side power source path that supplies an electric current output from the amplifying section via the output port to the amplifying section, a sink-side power source path that supplies an electric current drawn from the amplifying section via the output port to the amplifying section, a source-side capacitor that is connected between the output port of the amplifying section and the source-side power source path, and a sink-side capacitor that is connected between the output port of the amplifying section and the sink-side power source path.

Abstract: There is provided a power-supply circuit for supplying voltage to a load, having a power supply that generates power-supply voltage, an inverted outputting circuit having a positive voltage terminal for outputting positive voltage based on the power-supply voltage and a negative voltage terminal for outputting negative voltage generated based on the power-supply voltage and having different polarity from the positive voltage and outputting the positive and negative voltage while keeping the same direction in terms of directions of electric current flowing between the positive voltage terminal and the outside and of electric current flowing between the negative voltage terminal and the outside, a step-down output circuit for outputting predetermined step-down output voltage to the outside by connecting the positive and negative voltage terminals to the outside while switching them with a predetermined duty ratio and a step-up output circuit for supplying step-up output voltage whose absolute value is greater t

Abstract: A voltage generating apparatus generates an output voltage based on an input voltage. A voltage generator includes a first operational amplifier operative to receive the input voltage and a feedback voltage proportional to the output voltage. The voltage generator regulates the output voltage so that a virtual short circuit is produced in the first operational amplifier. An output capacitor smoothes the output voltage generated by the voltage generating apparatus. A sense signal generator detects a current flowing in the output capacitor and generates a sense signal proportional to the current detected. An adder-subtractor circuit superimposes the sense signal on at least one of the input and the output of the first operational amplifier.

Abstract: Power amplifier circuit outputs an output voltage corresponding to an input voltage supplied, and includes positive and negative-side output units including a positive or negative-side output resistor and a positive or negative-side transistor having its source terminal connected to one end of the positive or negative-side output resistor to make a current corresponding to a voltage supplied to its gate terminal flow to the positive or negative-side output resistor, positive and negative-side bias generating units which generate a positive or negative-side bias voltage corresponding to the input voltage, and positive and negative-side control units which control the voltage to be applied to the gate terminal of the positive or negative-side transistor such that the positive or negative-side bias voltage and source voltage of the positive or negative-side transistor become generally equal, and the voltage at connection node between the positive and negative-side output units is output as the output voltage.

Abstract: A direct current measuring apparatus includes a voltage generating part generating a voltage to be applied to a load being a measuring object; a current limiting part limiting a current flowing in the load to a set value; and an output terminal connected to the load. The current limiting part includes a D/A converter, a positive side limiting circuit, a D/A converter and a negative side limiting circuit. The positive side limiting circuit includes a negative feedback loop. The negative feedback loop includes a capacitor and a buffer circuit besides the feedback resistance. An output of the positive side limiting circuit positive side limiting circuit is connected to a non-inverting input terminal of the main amplifier through a diode.

Abstract: A power-supply circuit for supplying voltage to a load while freely selecting positive voltage and negative voltage using a single power supply has a power supply that generates power-supply voltage, an inverted outputting circuit having a positive voltage terminal for outputting positive voltage based on the power-supply voltage and a negative voltage terminal for outputting negative voltage generated based on the power-supply voltage and having different polarity from the positive voltage and outputting the positive and negative voltage while keeping the same direction in terms of directions of electric current flowing between the positive voltage terminal and the outside and of electric current flowing between the negative voltage terminal and the outside and a step-down output circuit for supplying predetermined voltage to the load by connecting the positive voltage terminal and the negative voltage terminal to the load while switching them with a predetermined duty ratio.

Abstract: A direct current measuring apparatus includes a voltage generating part generating a voltage to be applied to a load being a measuring object; a current limiting part limiting a current flowing in the load to a set value; and an output terminal connected to the load. The current limiting part includes a D/A converter, a positive side limiting circuit, a D/A converter and a negative side limiting circuit. The positive side limiting circuit includes a negative feedback loop. The negative feedback loop includes a capacitor and a buffer circuit besides the feedback resistance. An output of the positive side limiting circuit positive side limiting circuit is connected to a non-inverting input terminal of the main amplifier through a diode.

Abstract: Power amplifier circuit outputs an output voltage corresponding to an input voltage supplied, and includes positive and negative-side output units including a positive or negative-side output resistor and a positive or negative-side transistor having its source terminal connected to one end of the positive or negative-side output resistor to make a current corresponding to a voltage supplied to its gate terminal flow to the positive or negative-side output resistor, positive and negative-side bias generating units which generate a positive or negative-side bias voltage corresponding to the input voltage, and positive and negative-side control units which control the voltage to be applied to the gate terminal of the positive or negative-side transistor such that the positive or negative-side bias voltage and source voltage of the positive or negative-side transistor become generally equal, and the voltage at connection node between the positive and negative-side output units is output as the output voltage.

Abstract: There is provided a power source apparatus that includes a master circuit and a slave circuit provided in parallel and outputs an electric current that adds an electric current output from the master circuit and an electric current output from the slave circuit as a power-supply current. The master circuit includes: a main circuit side output section operable to output an electric current depending on a given voltage; a main circuit side reference power source operable to generate a reference voltage corresponding to a power-supply voltage that the power source apparatus is to output; and a main circuit side control section operable to supply the voltage corresponding to the reference voltage to the main circuit side output section in order to control the current output from the main circuit side output section.

Abstract: There is provided a power amplifier circuit that applies an output voltage according to a given input voltage to a load, the power amplifier circuit includes an amplifying section of which an output port is connected to the load and that outputs the output voltage according to the input voltage, a source-side power source path that supplies an electric current output from the amplifying section via the output port to the amplifying section, a sink-side power source path that supplies an electric current drawn from the amplifying section via the output port to the amplifying section, a source-side capacitor that is connected between the output port of the amplifying section and the source-side power source path, and a sink-side capacitor that is connected between the output port of the amplifying section and the sink-side power source path.

Abstract: A power circuit which can reduce power consumption. More specifically, a testing apparatus for testing an electronic device which includes: a pattern generation unit for generating a test pattern which is supplied to the electronic device; a power supply circuit for supplying power to the electronic device; and a decision unit for deciding pass/fail of the electronic device based on an output signal output from the electronic device, wherein the power supply circuit has: a voltage source for generating a predetermined input voltage to be applied to the electronic device; a power device for supplying the power to the electronic device based on the input voltage generated by the voltage source; a power supply for supplying drive power of the power device; and a voltage control unit for controlling a drive voltage applied by the power supply to the power device based on the power output from the power device.

Abstract: There is provided a power-supply circuit for supplying voltage to a load, having a power supply that generates power-supply voltage, an inverted outputting circuit having a positive voltage terminal for outputting positive voltage based on the power-supply voltage and a negative voltage terminal for outputting negative voltage generated based on the power-supply voltage and having different polarity from the positive voltage and outputting the positive and negative voltage while keeping the same direction in terms of directions of electric current flowing between the positive voltage terminal and the outside and of electric current flowing between the negative voltage terminal and the outside, a step-down output circuit for outputting predetermined step-down output voltage to the outside by connecting the positive and negative voltage terminals to the outside while switching them with a predetermined duty ratio and a step-up output circuit for supplying step-up output voltage whose absolute value is greater t

Abstract: There is provided a power source apparatus that includes a master circuit and a slave circuit provided in parallel and outputs an electric current that adds an electric current output from the master circuit and an electric current output from the slave circuit as a power-supply current. The master circuit includes: a main circuit side output section operable to output an electric current depending on a given voltage; a main circuit side reference power source operable to generate a reference voltage corresponding to a power-supply voltage that the power source apparatus is to output; and a main circuit side control section operable to supply the voltage corresponding to the reference voltage to the main circuit side output section in order to control the current output from the main circuit side output section.

Abstract: A power-supply circuit for supplying voltage to a load while freely selecting positive voltage and negative voltage using a single power supply has a power supply that generates power-supply voltage, an inverted outputting circuit having a positive voltage terminal for outputting positive voltage based on the power-supply voltage and a negative voltage terminal for outputting negative voltage generated based on the power-supply voltage and having different polarity from the positive voltage and outputting the positive and negative voltage while keeping the same direction in terms of directions of electric current flowing between the positive voltage terminal and the outside and of electric current flowing between the negative voltage terminal and the outside and a step-down output circuit for supplying predetermined voltage to the load by connecting the positive voltage terminal and the negative voltage terminal to the load while switching them with a predetermined duty ratio.

Abstract: There is provided a power source apparatus that includes a master circuit and a slave circuit provided in parallel and outputs an electric current that adds an electric current output from the master circuit and an electric current output from the slave circuit as a power-supply current. The master circuit includes: a main circuit side output section operable to output an electric current depending on a given voltage; a main circuit side reference power source operable to generate a reference voltage corresponding to a power-supply voltage that the power source apparatus is to output; and a main circuit side control section operable to supply the voltage corresponding to the reference voltage to the main circuit side output section in order to control the current output from the main circuit side output section.

Abstract: A testing apparatus includes a first power supply unit and first and second coaxial cables. The first power supply supplies current to a device under test. The first coaxial cable includes a first internal conductor and a first external conductor. The second coaxial cable includes a second internal conductor and a second external conductor. The first internal conductor and the second external conductor conducts current from the first power supply unit to the device under test. The second internal conductor and the first external conductor conducts current from the device under test to the first power supply unit.