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. 08, 2009
Filed:
Jun. 30, 2005
Jean-jacques Bouny, Fontenilles, FR;
Jean-Jacques Bouny, Fontenilles, FR;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A wireless communication unit comprises a semiconductor power amplifier device and a bias control circuit therefor. The bias control circuit comprises a detector for detecting at least a portion of the RF input signal; and a buffer for buffering the detected RF input signal. The detector is arranged to provide at least one inverted signal of the RF input signal. A semiconductor amplifier device is connected to an output of the bias control circuit and arranged to use an inverted detected signal to extract current from the output. When applied to a Doherty amplifier design, the biasing circuit requires fewer components, for example no video (buffer) amplifier and no delay block are required in the RF path. This facilitates integration of the circuit on a semiconductor die.