Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1998-07-14
2000-05-30
Miska, Vit
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
368118, 368120, 324 731, 327 9, G04F 800, G01R 1512
Patent
active
060698497
ABSTRACT:
A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. These signal transitions are counted over a predetermined time period to establish the average period of the oscillator. Finally, the average period of the oscillator is related to the average signal propagation delay through the test circuit. A phase discriminator samples the output of the oscillator and accumulates data representing the duty cycle of that signal. The duty cycle can then be combined with the average period of the test signal to determine, separately, the delays associated with falling and rising edges propagating through the test circuit.
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Conn Robert O.
Kingsley Christopher H.
Patrie Robert D.
Wells Robert W.
Behiel, Esq. Arthur J.
Miska Vit
Xilinx , Inc.
Young Edel M.
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