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. 12, 1988
Filed:
May. 20, 1986
Applicant:
Inventor:
Pascal Porrot, Monteson, FR;
Assignee:
Thomson Video Equipment, Gennevilliers, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
328155 ; 328133 ; 328167 ; 328170 ; 307262 ; 307511 ; 307350 ; 358312 ; 364178 ; 364825 ;
Abstract
A variable digital phase-shifter comprises a variable-propagation-time phase corrector consisting of a nonrecursive transversal digital filter having a predetermined even number N of coefficients. The filter is coupled with an amplitude corrector consisting of a nonrecursive transversal digital bandpass filter with an odd number of coefficients, a multiplier and a summing circuit for correcting the variations in gain of the phase corrector in order to obtain an approximately constant overall gain of the variable digital phase-shifter.