Abstract

CATALANO, José; PERETTI, Gabriela; ROMERO, Eduardo  and  MARQUES, Carlos. Oscillation Based Test in Continuous-Time Ladder Filters. Inf. tecnol. [online]. 2008, vol.19, n.4, pp.79-88. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642008000400011.

This paper analyzes the use of the oscillation-based test (OBT) to test high-order continuous-time ladder 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 combination of analytical and graphical methods, resulting very appropriate for the filters under study (fifth-order elliptic and Butterworth, RC active type). For characterizing the OBT scheme, a single deviation fault model for the filter passive components was adopted, and the lowest deviations in the value of 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 Butterworth filter. For the elliptic filter, good results were observed if the hard-to-test faults are related to the filter behavior.

Keywords : test; oscillations; filters; nonlinear oscillator; faults.

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