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:
Mar. 22, 2016
Filed:
Dec. 23, 2014
Skyworks Solutions, Inc., Woburn, MA (US);
Snaptrack, Inc., San Diego, CA (US);
David Steven Ripley, Marion, IA (US);
Sabah Khesbak, Irvine, CA (US);
Benjamin Bartram, Baldock, GB;
Kevin Lee Cobley, Cambridgeshire, GB;
Robert Astle Henshaw, Suffolk, GB;
Julian Hildersley, Hertsfordshire, GB;
Robert John Thompson, Cedar Rapids, IA (US);
SKYWORKS SOLUTIONS, INC., Woburn, MA (US);
SNAPTRACK, INC., San Diego, CA (US);
Abstract
Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a power amplifier system includes a power amplifier, an envelope tracker that generates the power amplifier's supply voltage, a power detector, and a calibration module. The envelope tracker includes an envelope shaping table generated at a desired gain compression and a scaling module that scales an amplitude of an envelope signal. The power detector measures the power amplifier's output power, and the calibration module provides calibration data to the scaling module to change the scaling of the envelope signal's amplitude. The calibration module sets the calibration data to a first value corresponding to a supply voltage level associated with substantially no gain compression, and reduces the supply voltage level by changing the calibration data until the power detector indicates that the gain compression of the power amplifier is about equal to the desired gain compression.