CONICET | Buscador de Institutos y Recursos Humanos

This paper analyzes the use of the oscillation-based test (OBT) to test high-order continuous-timeladder filters. The OBT implementation requires converting the filter under test into a non-linear oscillator.The prediction of the oscillation parameters (frequency and amplitude) is done using a combinationof analytical and graphical methods, resulting very appropriate for the filters under study (fifthorderelliptic and Butterworth, RC active type). For characterizing the OBT scheme, a single deviationfault model for the filter passive components was adopted, and the lowest deviations in the valueof the components, capable of being detected by monitoring amplitude and frequency, were established.The fault simulation results show that OBT is very appropriate for detecting faults in the Butterworthfilter. For the elliptic filter, good results were observed if the hard-to-test faults are related tothe filter behavior.