Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1989-02-14
1990-03-27
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
377 44, 328 72, 375110, H03L 700
Patent
active
049127349
ABSTRACT:
A high resolution event occurrence time counter includes a free running counter which is responsive to a clock signal and which provides count data that varies in response to the clock signal. A first register stores the count data of the free running counter. The first register provides first register data representative of the count data stored in the register. A second register stores the first register data and provides first time of arrival data representative of the first register data stored in the second register. A third register stores the count data of the free running counter. The third register provides second time of arrival data representative of the count data which is stored in the third register. A clock edge encoder determines whether an event occurred during the first half cycle of the clock signal or during the second half cycle. The clock edge encoder provides a first sync signal when the event occurred during the first half cycle, and a second sync signal when the event occurred during the second half cycle. The second register stores the first register data in response to the first sync signal, and the third register stores the count data in response to the second sync signal. Either the first time of arrival data or the second time of arrival data, depending on whether the first or second sync signal is generated, is provided as output time of arrival data of the event occurrence time counter.
REFERENCES:
patent: 4307449 (1981-12-01), Strubin
patent: 4352195 (1982-09-01), Dautremay et al.
patent: 4764694 (1988-08-01), Winroth
Ail Systems, Inc.
Heyman John S.
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