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:
Dec. 10, 2002
Filed:
Apr. 19, 1999
John S. Greeley, Ambler, PA (US);
James J. Edelen, III, Jamison, PA (US);
Bae Systems Aerospace Electronics Inc., Lansdale, PA (US);
Abstract
An RF transmission system including an RF power amplifier, said system comprising an harmonic cancellation processor. The harmonic cancellation processor produces a predistorted RF input signal to the RF amplifier which cancels harmonic energy generated by the amplifier. The RF output of the amplifier is sampled and stored in the harmonic cancellation processor. The harmonic cancellation processor also comprises a digital signal processor controlled by a computer program, the program comprising steps for analyzing the harmonic content of the sampled RF feedback signal, steps for comparing the harmonic content of the RF feedback signal to a history value for harmonic content, steps for adaptively correcting a predistorted RF waveform based on the harmonic content of the RF feedback signal to cancel harmonics produced by the RF amplifier when the predistorted waveform is input to the amplifier, and steps for producing a digital sample representation of the predistorted RF waveform for conversion to analog form and input to the RF amplifier.