Frequency domain approach to fault diagnosis of analog filters

This paper presents fault location technique for testing analog filters using a fault dictionary. The single hard faults of the filter passive elements can be located and identified. To enable the efficient testing, an initial fault dictionary is optimised in order to get the minimal size of the dictionary with maximum number of uniquely recognised faults. After a simulation, the procedure tests the circuit and locates the failed element using adequate fault isolation criterion. The performances of the described method are illustrated with an analog filter fault diagnosis example performed in the frequency domain. The fault detection problem has also been considered.