Low-dead-time interval timer

Details Low-dead-time interval timer Low-dead-time interval timer

1989-06-29

1991-06-25

Dixon, Joseph L.

Boots, shoes, and leggings

368120, 3281291, 377 20, G04F 800, G06F 1520

Patent

active

050272985

ABSTRACT:
A time-interval meter (10) employs a counter (16) to count the number of cycles of the output of an oscillator (18) that occur between a pulse on a start input line (12) and a subsequent pulse on a stop input line (14). The result is a coarse measurement. A filter (28) filters the output of the oscillator (18) to produce a sinusoidal signal, and the meter (10) refines the coarse measurement by employing analog-to-digital converters (20 and 22) to measure the values assumed by the sinusoidal signal at the occurrences of the start and stop pulses. A calculation circuit (24) employs an inverse trigonometric function of the converter outputs to determine the difference between the phases of the sinusoidal signal at the occurrences of the start and stop pulses, and it adds the time difference associated with this phase difference to the coarse measurement indicated by the cycle count to yield a total interval duration.

REFERENCES:
patent: 3970828 (1976-07-01), Klein
patent: 4142680 (1979-03-01), Oswald et al.
patent: 4168525 (1979-09-01), Russell
patent: 4186298 (1980-01-01), Kinbara
patent: 4192130 (1980-03-01), Takeuchi
patent: 4303983 (1981-12-01), Chaborski
patent: 4517684 (1985-05-01), Fennel
patent: 4584528 (1986-04-01), Ohmae et al.
patent: 4606058 (1986-08-01), Kruger et al.
patent: 4613951 (1986-09-01), Chu
patent: 4678345 (1987-07-01), Agoston
patent: 4823293 (1989-04-01), Oda
patent: 4908784 (1990-03-01), Box et al.

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