Abstract
When a feedback bridging fault occurs in a combinational circuit and it is activated, logical oscillation may be generated at the bridging signal lines. In this paper, the necessary conditions are presented for feedback bridging faults to generate logical oscillation. Also, a method is proposed to identify such faults in feedback bridging ones. It is based on piecewise-linearlized models obtained from input/output characteristics of logic gates and does not require circuit simulation of large size of circuits to identify them. In the experiments for evaluating the method, all of the feedback bridging faults to generate logical oscillation are identified by using the method.