Abstract: Various aspects of the present disclosed technology relate to techniques for hotspot root cause determination. Feature values for a plurality of design/process-related features for each of the layout regions of interest on a layout design are determined. Population ratios for feature value ranges for each of the plurality of design/process-related features are determined based on a number of layout regions of interest having feature values within each of the feature value ranges. Hotspot feature repeater values are determined. Based on the population ratios and the hotspot feature repeater values, a root cause analysis can be performed to determine one or more design/process-related features that are most likely causes for each of a plurality of hotspot layout regions. The information of the one or more design/process-related features can be used to identity other hotspot regions and adjust the layout design or to adjust a manufacturing process.

Abstract: This application discloses a computing system to identify suspected defects in a manufactured integrated circuit, which correspond to electrical failures detected by a test applied to the manufactured integrated circuit. The computing system can utilize the suspected defects in the manufactured integrated circuit to cluster features in a physical layout design describing the manufactured integrated circuit. Each cluster of the features corresponds to a candidate for a physical root cause of the suspected defects in the manufactured integrated circuit. The computing system can detect a physical root cause of the electrical failures in the manufactured integrated circuit based on the clusters of the features. A physical failure analysis process includes an inspection of the manufactured integrated circuit to confirm the physical root cause of the electrical failures in the manufactured integrated circuit corresponds to a systemic manufacturing fault in the manufactured integrated circuit.

Abstract: A method and an apparatus are disclosed to detect and isolate faults in a rotary machine having a rotor and at least two stator windings. The method comprises generating an input signal and applying the input signal to a set of stator windings while the rotor is locked at a rotor position, measuring output signals and processing the output signals by Fourier transform to obtain a frequency response, testing the rotary machine at discrete rotor positions to obtain a frequency response function of the rotor position, applying Fourier transform to the frequency response function to obtain a two-dimension frequency response in frequency and spatial frequency domain, comparing the two-dimension frequency response with a reference, determining that there is a fault in the rotary machine if the difference exceeds a threshold number. The apparatus is designed to test a rotary machine using the inventive method.

Abstract: A method and an apparatus are disclosed to detect and isolate faults in a rotary machine having a rotor and at least two stator windings. The method comprises generating an input signal and applying the input signal to a set of stator windings while the rotor is locked at a rotor position, measuring output signals and processing the output signals by Fourier transform to obtain a frequency response, testing the rotary machine at discrete rotor positions to obtain a frequency response function of the rotor position, applying Fourier transform to the frequency response function to obtain a two-dimension frequency response in frequency and spatial frequency domain, comparing the two-dimension frequency response with a reference, determining that there is a fault in the rotary machine if the difference exceeds a threshold number. The apparatus is designed to test a rotary machine using the inventive method.

Abstract: A method and an apparatus are disclosed to detect faults in a rotary machine having a rotor and at least two stator windings. The method comprises generating an input signal and applying the input signal to stator windings while the rotor is locked at a rotor position, measuring output signals from the stator windings and processing all the output signals by Fourier transform to obtain frequency responses of the stator windings, forming derived quantities from all the frequency responses so that the derived quantities are independent of the rotor position, comparing the derived quantities with corresponding reference quantities, determining that there is a fault in the rotary machine if a magnitude or phase difference between the derived quantities and the corresponding reference quantities exceeds a threshold number. The apparatus is designed to test a rotary machine using the inventive method.

Abstract: A method and an apparatus are disclosed to detect faults in a rotary machine having a rotor and at least two stator windings. The method comprises generating an input signal and applying the input signal to stator windings while the rotor is locked at a rotor position, measuring output signals from the stator windings and processing all the output signals by Fourier transform to obtain frequency responses of the stator windings, forming derived quantities from all the frequency responses so that the derived quantities are independent of the rotor position, comparing the derived quantities with corresponding reference quantities, determining that there is a fault in the rotary machine if a magnitude or phase difference between the derived quantities and the corresponding reference quantities exceeds a threshold number. The apparatus is designed to test a rotary machine using the inventive method.