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:
Jan. 03, 1989
Filed:
Nov. 16, 1987
Applicant:
Inventors:
Ettore Ceroni, Bergamo, IT;
Michelangelo Lo Curto, Milan, IT;
Assignee:
GTE Telecommunicazioni, S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
329124 ; 375 82 ; 375 88 ;
Abstract
A circuit and method for the acquisition of carrier synchronism in coherent demodulators which operate with carriers modulated by Phase-Shift Keying (PSK). The invention makes use of simple, low-cost circuitry and gives the phase-lock loop of the demodulator an added frequency characteristic which prevents false locks and ensures lock between the local carrier and the reference signal even for very large frequency variations.