Abstract: A method of testing an electronic circuit is provided. The method comprises radiating a laser beam onto the electronic circuit, and determining a plurality of samples of a response signal output by the electronic circuit during the period when the laser beam is radiated. The method further comprises accumulating the plurality of samples to generate a value, and generating a test result based on the value.

Abstract: A method and system for measuring laser induced phenomena changes of at least one of a resistance, a capacitance and an inductance in a semiconductor device. The method comprises interconnecting an electrical bridge circuit across the semiconductor device, the semiconductor device being connected as one of at least four circuit elements of the bridge circuit; inducing the changes in the semiconductor; and monitoring a balance condition of the bridge circuit.

Abstract: Apparatus for and methods of inspection using laser beam induced alteration are provided. In one aspect, an apparatus is provided that includes a laser scanning microscope for directing a laser beam at a circuit structure and a source for biasing and thereby establishing a power condition in the circuit structure. A detection circuit is provided for detecting a change in the power condition in response to illumination of the circuit structure by the laser beam and generating a first output signal based on the detected change. A signal processor is provided for processing the first output signal and generating a second output signal based thereon. A control system is operable to scan the laser beam according to a pattern that has a plurality of pixel locations, whereby the laser beam may be moved to a given pixel location and allowed to dwell there for a selected time before being moved to another pixel location.