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. 17, 1989
Filed:
Mar. 06, 1987
Soenke Mehrgardt, March, DE;
Deutsche ITT Industries GmbH, Freiburg, DE;
Abstract
This control circuit adjusts two signal waveforms to a phase difference of exactly 90.degree. and to exactly equal amplitudes of the respective frequency components. It is a digital circuit containing a phase control stage (pr) and an amplitude control stage (ar). The control circuit (r) delivers first and second quadrature signals (q1, q2) which are multiplied together to obtain a phase control value (p) which is multiplied by one of the digitized quadrature analog signals and added vectorially to the second digital signal. The two signals thus brought to a phase difference of exactly 90.degree. are the two phase-corrected digital signals (p1, p2). In the amplitude control stage (ar), one of the two phase-corrected digital signals (p2, p1) is multiplied by the amplitude control value (g) from the amplitude comparator (av1, av2), and the product is the amplitude- and phase-corrected quadrature signal (q2, q1) belonging to the other quadrature signal (q1, q2).