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. 22, 1988
Filed:
Sep. 13, 1985
William T Schmars, Fullerton, CA (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
A synthetic quadrature generating apparatus responsive to an input reference signal of the form SIN(wt) from an input reference signal source and to an error shifted quadrature signal of the form COS(wt+L) for forming a quadrature output signal of the form COS(wt)*COS(L) substantially free of error shift. The apparatus comprises an error signal synthesizing filter means responsive to the input reference signal and to the error shifted quadrature signal for forming a filtered signal of the form SIN(L); a correction means responsive to the input reference signal and to the filtered signal for forming their product as a filtered product signal; and a means responsive to the filtered product signal and the error shifted quadrature signal for forming their sum as an output quadrature signal of the form COS(wt)*COS(L).