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:
Jul. 16, 2013
Filed:
Jun. 10, 2010
Toru Matsuura, Osaka, JP;
Kenichi Mori, Osaka, JP;
Wayne S. Lee, San Mateo, CA (US);
Akihiko Matsuoka, Kanagawa, JP;
Toru Matsuura, Osaka, JP;
Kenichi Mori, Osaka, JP;
Wayne S. Lee, San Mateo, CA (US);
Akihiko Matsuoka, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A transmission circuit that performs modulation based on a phase difference signal and an amplitude signal includes an asymmetrical phase rotation device. The asymmetrical phase rotation device performs an operation of subtracting 2π from a value of the phase difference signal when the value of the phase difference signal is greater than a predetermined positive threshold value, or an operation of adding 2π to the value of the phase difference signal when the value of the phase difference signal is less than a predetermined negative threshold value. Accordingly, the transmission circuit has distortion reduction characteristics improved uniformly over a range of frequencies higher or lower than a carrier wave band.