Oscillation detecting apparatus and test apparatus

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element

Reexamination Certificate

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Details

C324S1540PB, C327S078000, C327S018000, C331S025000, C340S660000

Reexamination Certificate

active

07034562

ABSTRACT:
An oscillation detecting apparatus for detecting oscillation of a signal includes a high pass filter for generating an alternating current signal from which a direct current component of the signal is removed, a slicing circuit for generating a limit signal which results from restricting an amplitude level of the alternating current signal to a level lower than a predetermined level, an integration circuit for integrating a waveform of the limit signal during a predetermined period, and a comparator for detecting whether or not the signal oscillates based on a value of the waveform integrated by the integration circuit.

REFERENCES:
patent: 3801799 (1974-04-01), Atkins
patent: 3806905 (1974-04-01), Strenglein
patent: 3976940 (1976-08-01), Chau et al.
patent: 5049838 (1991-09-01), Voyce
patent: 5170135 (1992-12-01), Ito et al.
patent: 6819196 (2004-11-01), Lovelace et al.
patent: 2003/0184391 (2003-10-01), Sekimoto
patent: 58-52571 (1983-03-01), None
patent: 60-2347 (1985-01-01), None
patent: 63-168866 (1988-11-01), None
patent: 2000-304815 (2000-11-01), None
International Search Report dated Aug. 30, 2005 (3 pages).

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