Patent ID: 6686756
Filing Date: 2004-02-03
Classification: G01R

Abstract:
A system for testing an integrated circuit (IC) having a power supply terminal VDD for defects, said system comprising:a voltage source having a voltage source output terminal Vaa; a resistive element connected to said voltage source output terminal Vaa; said resistive element being connectable to the power supply terminal VDD of the IC; at least one controllable output voltage source having an output voltage terminal VVS; at least one switch element so configured as to selectively connect said output voltage terminal VVS to the power supply terminal VDD; a differentiator connected to the power supply terminal VDD; said differentiator being so configured as to determine a direction of a voltage variation at the power supply terminal VDD; and a controller connected to said at least one controllable output voltage source, to said at least one switch element, to said differentiator and to the IC to thereby supply at least one test vector thereto; said controller being so configured as to approximate a voltage value of the power supply terminal VDD and to determine, via the approximated voltage value, if the IC under test is faulty.