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:
Feb. 07, 2017
Filed:
Jun. 27, 2014
Fodan Co. Ltd., Tokyo, JP;
Hiroshi Kurihara, Tokyo, JP;
FODAN CO. LTD., Tokyo, JP;
Abstract
The present invention provides a compound transmitter having power efficiency characteristics and distortion characteristics superior, over a wide band, to those of a Doherty transmitter, and having fewer elements constituting an RF circuit. The present invention is therefore provided with a compound amplifier () for generating a signal (z) (efficiency improving signal) obtained by the amplitude modulation of a carrier signal from an RF modulation signal (a) (main signal); power-modulating, using two power amplifiers (), a signal (S) obtained by adding together (a) and (z), and a signal (S) obtained by subtracting (z) from (a); and setting, as a transmitter output point, the point (p) where the respective outputs are combined via impedance inverters (), the efficiency improving signal (z) being generated under conditions in which the size of the envelope of either (S) or (S) is fixed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile