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. 24, 2001
Filed:
Dec. 30, 1999
Douglas D. Fitzpatrick, Palatine, IL (US);
Clark D. Fischbach, West Dundee, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
In a transmitter (,) that includes a radio frequency (RF) power amplifier (,), a predistortion signal loop (,), and a feedforward correction loop (,), a method and apparatus is provided for correcting distortion introduced into the transmitter by the RF power amplifier. The predistortion signal loop determines a RF power amplifier characterization function that characterizes a relationship between a signal input into the RF power amplifier and the resulting signal output by the RF power amplifier. The predistortion signal loop also determines a predistorted input signal that is based on an input signal received from an information source and on the RF power amplifier characterization function, which predistorted input signal is input into the RF power and includes input signal modifications that are meant to compensate for the distortion introduced introduced by the RF power amplifier. Any residual distortion that is introduced by the RF power and not canceled by the predistortion signal loop is then further reduced by the feedforward correction loop.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile