Self-calibrating time interval meter

Details Self-calibrating time interval meter Self-calibrating time interval meter

1983-09-22

1986-09-23

Lall, Parshotam S.

Boots, shoes, and leggings

340347NT, 377 20, 364571, G04F 706

Patent

active

046139508

ABSTRACT:
A self-calibrating time interval meter including means for measuring time intervals using a dual-speed ramp technique. The time interval meter operates in a measurement mode to measure time intervals and operates in a calibration mode for calibration adjustments. In measurement mode, the time interval meter utilizes a dual-speed ramp technique to expand the time interval to be measured. A capacitor is rapidly charged by a first constant current source during the time interval to be measured, and is then slowly discharged by a second constant current source. The time required to discharge the capacitor is measured and utilized to compute a measurement of the time interval. In calibration mode, a flip-flop is alternately switched into and out of the circuit to provide two time interval measurements that differ by exactly one clock period of a known clock signal. A microprocessor subtracts the two measurements and compares the difference to the known clock period to determine a calibration error. The microprocessor, through a digital-to-analog converter, varies the current flow of the first constant current source to minimize the calibration error by compensating for drift in the current sources.

REFERENCES:
patent: 3878370 (1975-04-01), Santomango et al.
patent: 3920961 (1975-11-01), Berg
patent: 4303880 (1981-12-01), Munt et al.
patent: 4303983 (1981-12-01), Chaborski
patent: 4395701 (1983-07-01), Evans
patent: 4468746 (1984-08-01), Davis
patent: 4523289 (1985-06-01), Soma et al.

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