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:
Sep. 07, 1982
Filed:
Jan. 08, 1980
Applicant:
Inventors:
Lex A Scott, Huntsville, AL (US);
William H Mosley, Jr, St. Petersburg, FL (US);
Carl F Andren, Indiatlantic, FL (US);
Assignee:
E-Systems, Inc., Dallas, TX (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ; H03K / ;
U.S. Cl.
CPC ...
329 50 ; 329124 ; 375 94 ;
Abstract
A recovery loop includes an analog circuit that mixes a fixed frequency signal from a temperature controlled oscillator (20) with an IF input to produce product signals corresponding to the quadrature components of data signals with frequency offset. A digital complex multiplier (32) is responsive to the product signals and to the output of a number controlled oscillator (34) to produce a digital output corresponding to the data signals. The output of the number controlled oscillator (34) is controlled by a digital phase lock loop.