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:
Oct. 23, 2007
Filed:
Sep. 04, 2003
François Baron, Cesson Sévigné, FR;
Jean-yves Le Naour, Pace, FR;
Jean-luc Robert, Betton, FR;
Thomson Licensing, Boulogne-Billancourt, FR;
Abstract
The invention relates to processes and devices which make it possible to directly modulate an RF carrier with a quadrature signal. It consists in filtering () this quadrature signal around zero so as to introduce alternately () on each of the channels a low-frequency subcarrier that will serve as reference. Each of these channels is alternately demodulated in a synchronous manner () cosine-wise and sine-wise. The demodulation signal is filtered () so as to recover the subcarrier marred by modulation errors. The measurement of these errors () allows feedback correction () of the quadrature signal. It makes it possible to perform the major part of the operations in the digital processor () and enables direct vector modulation to be made possible at millimeter frequencies.