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. 22, 1982
Filed:
Jul. 14, 1980
Applicant:
Inventor:
Stanley W Attwood, Scottsdale, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
329 50 ; 329122 ; 331 12 ; 331 17 ; 331 25 ;
Abstract
A phase shift keyed (PSK) demodulator includes a closed loop wherein a phase error signal is generated to control a voltage controlled oscillator (VCO) to track the carrier frequency of an input signal for demodulation. A frequency discriminator is incorporated with the PSK demodulator to provide a frequency error voltage which is also applied to the VCO to improve the tracking of the carrier frequency by substantially eliminating false locks and removing the dependence of the apparatus on the modulation of the received signal.