Fault diagnosis in mixed-signal low testability system
This paper describes a new approach for fault diagnosis of analog multi-phenomenon systems with low testability. The developed algorithms include identification of ambiguity groups, fault diagnosis methodology and solving low testability equations. Our aim is to identify a minimum number of faulty parameters that satisfy the test equations called a minimum form solution. An algorithm to find a minimum form solution is presented, which is based on the solution invariant matrix and an identification of singular cofactors of this matrix. System simulation using a developed C++ and Matlab programs was performed to test different faulty circuits. Test examples are discussed and simulation results are presented.
fault diagnosis ambiguity groups minimum form solution solution invariant matrix singular cofactor