Analog fault diagnosis-A practical approach

This paper describes a new implementation of model-based diagnosis for analog circuits that uses techniques from circuit optimisation to perform both hypothesis testing and component modelling. The approach explicitly takes account of tolerance deviations on components and of errors in measurements; it can diagnosis both catastrophic faults due to open/short circuiting and parametric faults due to component tolerances. The method can be used to locate faults within medium to large circuits within several minutes without an excessive number of measurements