Patent ID: 6448800
Filing Date: 2002-09-10
Classification: G01R

Abstract:
A load current output circuit for supplying a load current to an electronic device to be tested by an IC tester, which tests a state of a waveform of an output signal of said electronic device by supplying a predetermined waveform signal from a driver to said electronic device through a transmission line and receiving the output signal of said electronic device, which is changed from a high level to a low level or from a low level to a high level, through said transmission line or other transmission line, said load current output circuit comprising a detection circuit for detecting a voltage level on a portion of said transmission line on a side thereof, which receives said output signal from said electronic device under test through said transmission line or said other transmission line, wherein a predetermined current is pulled in from said transmission line or said other transmission line when the voltage level detected by said detection circuit is in low level and a predetermined current equal to or different from said predetermined current to be pulled in is supplied to said transmission line or said other transmission line when the detected voltage level detected by said detection circuit is in high level.