Patent ID: 6501288
Filing Date: 2002-12-31
Classification: G01R

Abstract:
A method of testing an integrated circuit, comprising the acts of:providing a first photosensitive element on a principal surface of the integrated circuit; coupling the first photosensitive element to a first storage element on the integrated circuit; coupling a first circuit node of the integrated circuit to the storage element; directing a first pulsed light beam to the first photosensitive element; storing an electrical state of the circuit node in the first storage element in response to the first pulsed light beam; providing a second photosensitive element on a principal surface of the integrated circuit; coupling the second photosensitive element to a second storage element on the integrated circuit; coupling a second circuit node of the integrated circuit to the second storage element; directing a second pulsed light beam to the second photosensitive element; storing an electrical state of the second circuit node in the second storage element in response to the second pulsed light beam; and determining a fixed temporal relationship between the pulsed light beams and the electrical state of the circuit nodes.