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:
Apr. 06, 1993
Filed:
Dec. 26, 1991
Applicant:
Inventor:
Gopal K Srivastava, Arlington Heights, IL (US);
Assignee:
Zenith Electronics Corporation, Glenview, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ; H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 10 ; 331 16 ; 331 25 ;
Abstract
A variable speed phase locked loop includes a phase detector and a voltage controlled oscillator, the output of which is provided through a divider circuit to the phase detector. A plurality of delay elements and a decoder divide the period of the phase detector input signal into discrete portions for enabling a plurality of weighted current sources. The current sources are coupled to the phase detector and change its gain. In the locked condition with minimum phase error, the gain of the phase detector is at a minimum and is progressively increased to a maximum when the phase error is maximum.