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:
Jun. 30, 1981
Filed:
May. 21, 1979
Applicant:
Inventor:
Ernest C Wittke, West Caldwell, NJ (US);
Assignee:
The Singer Company, Little Falls, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
328133 ; 328155 ; 331 / ; 331 27 ;
Abstract
A phase locked loop circuit employing a first edge detector consisting of an exclusive OR gate and flip flop circuit feeding by way of a NAND gate, an up counter and a second edge detector of like kind feeding also by way of a NAND gate into a down counter. Both counters feed into an added which provides a signal to a decoder representing the phase difference between the input phase and the output phase signal. The phase processing system provides positive rapid pull-in over the entire frequency range capability of the VCO, which allows narrow bandwidth loops to track rapid rates of frequency change without loss of lock and with great accuracy.