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:
Aug. 02, 1994
Filed:
Oct. 25, 1993
Ulrich Mohlmann, Buchholz-Dibbersen, DE;
Gerd Onken, Hamburg, DE;
Dieter Kunze, Lentforden, DE;
Jorg Wolber, Pinneberg-Thesdorf, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A digital phase-locked loop (PLL) which responds to a square-wave input signal of on expected frequency f.sub.E and comprises a change-over switch which is switched in response to square-wave signals or different frequencies and precedes a main divider operating with a divisor D and which produces the output signal of the phase-locked loop. The change-over switch is activated as a function of the output signal and the input signal. In order to provide symmetrical locking in of the phase-locked loop and a small capture-and-hold range, the change-over switch is switched between a first square-wave signal of the frequency f.sub.1, a second square-wave signal of the second frequency f.sub.2 and a third square-wave signal of the frequency f.sub.3, in which: