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:
Sep. 05, 2006
Filed:
Jan. 18, 2005
Michael P. Johnson, Poway, CA (US);
Michael S. Andrews, Escondido, CA (US);
Robert A. Bramble, San Diego, CA (US);
Michael P. Johnson, Poway, CA (US);
Michael S. Andrews, Escondido, CA (US);
Robert A. Bramble, San Diego, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
A radio-frequency (RF) transmitter power amplifier circuit provides for practically linear performance by predistorting the amplifier input signals to compensate for amplifier distortion at high power levels, and provides a fine degree of control of amplifier power needed to handle complex modulation schemes with widely and rapidly varying power requirements. A predistortion database () contains gain and phase corrections for various transmission types and a separate automatic gain control database () contains fine amplifier gain corrections. A real-time processor () combines the two types of corrections and applies them to the amplifier input signals, and a background processor () continually updates both databases in accordance with a programmable priority scheme. Integration of predistortion and amplifier power control is achieved in a manner that minimizes adverse effects of one type of control on the other. One feature of the invention provides for rapid convergence of the predistortion correction.