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:
May. 02, 2006
Filed:
Feb. 10, 2004
Mark Gurvich, Costa Mesa, CA (US);
Bill Vassilakis, Orange, CA (US);
Ezmarai Arbab, Laguna Niguel, CA (US);
Alexander Rabinovich, Cypress, CA (US);
Mark Gurvich, Costa Mesa, CA (US);
Bill Vassilakis, Orange, CA (US);
Ezmarai Arbab, Laguna Niguel, CA (US);
Alexander Rabinovich, Cypress, CA (US);
Powerwave Technologies, Inc., Santa Ana, CA (US);
Abstract
A feed forward power amplifier is disclosed which utilizes three signal cancellation loops. Loopincludes a main amplifier and is used to derive a carrier cancelled sample of the main amplifier output. Loopincludes an error amplifier used to amplify the carrier cancelled signal derived from Loopoperation in order to cancel distortion products generated due to the nonlinear nature of the main amplifier. Loopalso utilizes a very short Loopdelay line. A significant efficiency gain is provided due to reduced output power losses associated with the Loopdelay line. Lower output losses also results in lower distortion levels produced by the main amplifier. This, in turn, reduces the size and performance requirements placed on the error amplifier. A smaller and more efficient error amplifier is employed resulting in further amplifier system efficiency improvement. A spurious signal detector for out-of-band distortion detection and an associated microcontroller for Loopand Loopcontrol are also provided. A third signal cancellation loop is utilized to sample the amplifier output and reduce the carrier level of the signals sampled at the output of the amplifier before providing the sampled output to the spurious signal detector. By significantly reducing the carrier power level relative to distortion power levels a cost effective spurious signal detector can be utilized. This also provides a faster conversion time in Loopcancellation and enhanced cancellation of out-of-band distortion products due to a greater useful dynamic range available for the DSP employed in the spurious signal detector.