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:
Feb. 26, 2008
Filed:
Jun. 10, 2005
Wayne Kennan, Palo Alto, CA (US);
Wayne Kennan, Palo Alto, CA (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty amplifier increases the efficiency of the power amplifier at backoff power levels. The output stage includes main and peaking amplifiers connected in parallel and operating 90 degrees out-of-phase. The main amplifier is controlled using a first variable supply voltage, and the peaking amplifier is controlled using a second variable supply voltage. The first and second variable supply voltages are provided such that the main amplifier is active and the peaking amplifier is inactive for output power levels less than a predetermined backoff from a maximum output power level, and both the main amplifier and peaking amplifiers are active and operating in concert for output power levels greater than the predetermined backoff.