The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 1980
Filed:
Nov. 03, 1978
Keith M Ferguson, San Jose, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The relative occurrence of first and second input signals is determined by sampling the output signal of a comparator which compares a predetermined voltage source output signal with the output signal from a ramp generator which is triggered by the first input signal. The sampling signal is provided in response to the second input signal after a preselected time delay. A balancing calibration is used to insure that if the signals are coincident, the ramp generator signal is equal to the voltage reference signal at the moment of sampling. Therefore, the precedence of the first and second input signals is determined by sampling the comparator output signal in response to the sampling signal and determining the relative values of the ramp voltage signal and the voltage reference signal at the time of sampling.