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:
Oct. 21, 2008
Filed:
Jul. 27, 2005
Joseph Staudinger, Gilbert, AZ (US);
Benjamin R. Gilsdorf, Phoenix, AZ (US);
David A. Newman, Tempe, AZ (US);
George B. Norris, Gilbert, AZ (US);
Gary W. Sadowniczak, Phoenix, AZ (US);
Richard E. Sherman, Mesa, AZ (US);
Joseph Staudinger, Gilbert, AZ (US);
Benjamin R. Gilsdorf, Phoenix, AZ (US);
David A. Newman, Tempe, AZ (US);
George B. Norris, Gilbert, AZ (US);
Gary W. Sadowniczak, Phoenix, AZ (US);
Richard E. Sherman, Mesa, AZ (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A radio frequency ('RF') power amplifier circuit as described herein is configured to detect and measure an output load mismatch and to adjust the operating characteristics of the RF power amplifier to reduce output signal distortion. The circuit includes a directional RF signal coupler that obtains a coupled reflected RF signal that is indicative of the output load mismatch. The coupled reflected RF signal is processed to generate one or more bias control signals for the RF power amplifier. In operation, a mismatch condition will result in a measurable coupled reflected RF signal and a corresponding reduction in output power from the RF power amplifier. Ultimately, the output power control mechanism strives to maintain the RF power amplifier within a linear operating range.