Abstract: A testing apparatus for testing a device under test, includes a power source for generating a current, a coaxial cable unit for supplying the current to the device under test, a detecting unit for detecting a voltage applied to the device under test when the current is supplied to the device under test and a judging unit for judging quality of the device under test based on the detected voltage, wherein the coaxial cable unit includes a first coaxial cable including a first internal conductor and a first external conductor, and a second coaxial cable including a second internal conductor and a second external conductor, wherein the first internal conductor and the second external conductor conduct a current from the power source towards the device under test, and the first external conductor and the second internal conductor conduct a current from the device under test towards the power source.

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 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 for generating a current to be supplied to the device under test and first and second coaxial cables through which the current generated by the first power supply unit is supplied to the device under test, wherein the first power supply unit includes a current detecting unit for detecting an amount of a voltage drop when the current generated by the first power supply unit passes through a predetermined resistor and a current controlling unit for controlling the current being supplied to the device under test in response to the amount of the voltage drop detected by the current detecting unit, the first coaxial cable includes a first internal conductor for conducting the current from the first power supply unit towards the device under test and a first external conductor provided around the first internal conductor with an insulator interposed therebetween for conducting the current from the device under test towards the first power supply unit, and the s

Abstract: A testing apparatus for testing a device under test, includes a power source for generating a current, a coaxial cable unit for supplying the current to the device under test, a detecting unit for detecting a voltage applied to the device under test when the current is supplied to the device under test and a judging unit for judging quality of the device under test based on the detected voltage, wherein the coaxial cable unit includes a first coaxial cable including a first internal conductor and a first external conductor, and a second coaxial cable including a second internal conductor and a second external conductor, wherein the first internal conductor and the second external conductor conduct a current from the power source towards the device under test, and the first external conductor and the second internal conductor conduct a current from the device under test towards the power source.