Fault analysis of nonlinear circuits from node voltage measurements

A method is proposed to diagnose and identify faults in active nonlinear resistive circuits. The nonlinear resistances are replaced by the current sources. The nonlinearity of circuits is exploited to identify if the faults occur in nonlinear resistances. When no fault occurs in nonlinear resistances, the parameters of the linear resistances and the dependent sources and the characteristics of the nonlinear resistances may be determined uniquely. When multiple faults occur in nonlinear resistances, they also can be determined uniquely under a certain condition