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:
Apr. 22, 2014
Filed:
Nov. 28, 2011
Hirofumi Honjo, Palo Alto, CA (US);
Brian Baxter, Greensboro, NC (US);
Stuart Williams, Horsham, GB;
Roman Zbigniew Arkiszewski, Oak Ridge, NC (US);
David E. Jones, Cedar Rapids, IA (US);
Chris Levesque, Fountain Valley, CA (US);
William David Southcombe, San Diego, CA (US);
Scott Yoder, Fuquay Varina, NC (US);
Terry J. Stockert, Cedar Rapids, IA (US);
Hirofumi Honjo, Palo Alto, CA (US);
Brian Baxter, Greensboro, NC (US);
Stuart Williams, Horsham, GB;
Roman Zbigniew Arkiszewski, Oak Ridge, NC (US);
David E. Jones, Cedar Rapids, IA (US);
Chris Levesque, Fountain Valley, CA (US);
William David Southcombe, San Diego, CA (US);
Scott Yoder, Fuquay Varina, NC (US);
Terry J. Stockert, Cedar Rapids, IA (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
A power amplifier (PA) envelope power supply, which provides an envelope power supply signal to radio frequency (RF) PA circuitry, and a process to prevent undershoot of the PA envelope power supply is disclosed. The process includes determining if an envelope control signal to the PA envelope power supply has a step change from a high magnitude to a low magnitude that exceeds a step change limit. Such a step change may cause undershoot of the PA envelope power supply. As such, if the step change exceeds the step change limit, the envelope control signal is modified to use an intermediate magnitude for period of time. Otherwise, if the step change does not exceed the step change limit, the envelope control signal is not modified.