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:
Sep. 09, 1980
Filed:
Nov. 24, 1978
Thomas E Bowers, Warrenville, IL (US);
Dennis E Tomlinson, Warrenville, IL (US);
Other;
Abstract
A phase locked loop circuit (100) for generating a periodic clock signal from a controlled oscillator circuit (130) in phase coincidence with a synchronous aperiodic data input signal is disclosed. A pulse of the data signal and a corresponding pulse of the clock signal are applied to a bistable circuit (FF1) having an output signal indicating which of the pulses occurs first in time. The pulses are further applied through delay circuitry (DLY1, DLY2) to another bistable circuit (FF2) having an output signal indicative of the magnitude of phase difference between the pulses. The output signals of the bistable circuits (FF1, FF2) are applied to a multilevel driver circuit (140) which generates an error correction signal pulse defining magnitude and direction of a correction signal to be applied to the oscillator circuit (130).