An approach to the fault diagnosis and testability in analog circuits at module level

In this paper, a module level fault diagnosis method is presented which considers multi-port device or subnetwork as the basic unit. The fault model in this method is quite similar to an actual condition, hence it has practical meaning. The equations of moedule level fault diagnosis are derived, and the testability problem for module-fault diagnosis is discussed in general. The paper then gives several toplolgical conditions for module-fault testability, which are applicable to a general nonreciprocal network by introducing a generalized independent path.