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:
Nov. 29, 1983
Filed:
Mar. 10, 1981
Applicant:
Inventors:
Arnold Swagerty, Vienna, VA (US);
William A Mitchell, Fairplay, MD (US);
Assignee:
Frederick Electronics Corporation, Frederick, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
328155 ; 364715 ; 375120 ; 331 / ; 331 25 ;
Abstract
A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, and a binary rate multiplier to perform the function of voltage-to-frequency conversion is disclosed. A more precise frequency resolution is obtained by use of the binary rate multiplier and a further reduction in circuit complexity is achieved by removal of the phase shifter circuit in favor of the microprocessor programming.