Abstract: Provided is a testing circuit including a voltage supply unit which generates an output voltage, a pulse generation unit which generates a pulse signal by using the output voltage from the voltage supply unit in a functional test of a device under test and supplies the pulse signal to a device under test, and a measurement circuit which adjusts a voltage or a current supplied to a device under test in a voltage application current measurement test or a current application voltage measurement test of a device under test to a test voltage or a test current and performs the voltage application current measurement test or the current application voltage measurement test by using the test voltage or the test current, in which the measurement circuit is connected at least between the voltage supply unit and the pulse generation unit.

Abstract: Provided is a testing circuit including a measurement circuit which generates an output voltage and performs a voltage application current measurement test of a device under test by using the output voltage, a pulse generation circuit which generates a pulse signal by using the output voltage of the measurement circuit in a functional test of a device under test to supply the pulse signal to a terminal of a device under test and causes the output voltage of the measurement circuit to pass therethrough in the voltage application current measurement test to supply the output voltage to a terminal of a device under test as a test voltage, and an output end feedback line which is connected to an output end side of the pulse generation circuit and feeds back a voltage on the output end side to the measurement circuit.

Abstract: The response characteristics of an output signal and current consumption are kept constant. A drive circuit for outputting an output signal having a voltage determined by a logic of an input signal includes a constant voltage generating section generating a constant bias voltage, a CML circuit outputting the output signal having the voltage determined by the logic of the input signal, where an amplitude of the output signal is determined by a constant current flowing through the CML circuit and a potential of the output signal is determined by the bias voltage, an adjustment constant current source that allows a constant current to flow out from a bias voltage output end of the constant voltage generating section, and a current setting section that sets in advance the constant current flowing into the adjustment constant current source, according to the constant current flowing through the CML circuit.