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:
Jan. 13, 2009
Filed:
Jul. 11, 2006
Grant Andrew Ellis, Gelugor, MY;
Miroslav Micovic, Thousand Oaks, CA (US);
Keh-chung Wang, Thousand Oaks, CA (US);
Jeongsun Moon, Moorpark, CA (US);
Grant Andrew Ellis, Gelugor, MY;
Miroslav Micovic, Thousand Oaks, CA (US);
Keh-Chung Wang, Thousand Oaks, CA (US);
JeongSun Moon, Moorpark, CA (US);
HRL Laboratories, LLC, Malibu, CA (US);
Abstract
A post-distortion method for cascading amplifier stages in a two-stage microwave power amplifier and a dynamic biasing method using back-end processing for correcting nonlinearity in the power amplifier output. A first or driver stage biased in a near-A region with low distortion is cascaded with a second or power stage biased in a near-C region with high efficiency. The amplitude and phase responses of the two stages compensate another to yield a more linear overall gain for the overall power amplifier. The dynamic biasing scheme modulates the source to drain voltages of the transistors used in the amplifier stages based on the harmonics in amplifier output in order to minimize the harmonics and correct non-linearity in the output.