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. 08, 1992
Filed:
Jul. 13, 1990
Richard Wahler, Ronkonkoma, NY (US);
Carl Schooley, Setauket, NY (US);
Robert Gross, Setauket, NY (US);
Standard Microsystems Corporation, Hauppauge, NY (US);
Abstract
A data separator for use in synchronizing data derived from a floppy disk or similar data source provides a variable net gain or loss of charge to vary the frequency of a voltage-controlled oscillator in accordance with the relative position of the data with respect to the clock until data centering or synchronization is achieved. The net charge is derived from a charge pump circuit that is controlled by a charge pump-up signal whose duration is proportional to the detected phase difference between the data and the clock, and a charge pump-down signal whose duration is one clock cycle. When the data pulse is centered within a clock cycle, the duration of a pump-up signal is one half that of a pump-down signal.