Apparatus and method for test, characterization, and...

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

Reexamination Certificate

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C324S076350

Reexamination Certificate

active

07495429

ABSTRACT:
A circuit board with a processing unit and a delay line with a controllable number of delay elements fabricated thereon includes apparatus for testing and calibrating the delay line elements. In the test mode, a calibrated pulse is delayed by the delay line while determining the logic state of pulse at two times, the interval between the two times being the same as the pulse width. By adding delay elements, the period of the calibrated pulse as a function of number of delay elements can determine the delay of each delay element. In the calibration mode, the delay line is configured as a ring oscillator and the frequency of the ring oscillator as a function of number of delay elements provides the time delay for the individual elements.

REFERENCES:
patent: 6091891 (2000-07-01), Overall et al.
patent: 6390579 (2002-05-01), Roylance et al.

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