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:
Jul. 28, 2015
Filed:
Jul. 24, 2013
Crestcom, Inc., Scottsdale, AZ (US);
Ronald Duane McCallister, Scottsdale, AZ (US);
CrestCom, Inc., Scottsdale, AZ (US);
Abstract
A transmitter () generates a time-varying stabilized bias signal () from which sub-RF distortion signals () have been cancelled. The distortion signals () are byproducts of imperfect amplification and of biasing networks. An envelope amplifier () includes a high bandwidth differential input, linear, bias signal amplifier () and a low bandwidth switching amplifier () coupled together to achieve both a high bandwidth and high efficiency. A control loop () feeds a portion of the voltage V(t) from a conduction node () of the RF power amplifier () to one of the differential inputs of the linear bias signal amplifier (), while a bias control signal () drives the other differential input. The portion of voltage V(t) fed to bias signal amplifier () is a low power portion from which the RF portion has been removed. A bias signal () may be predistorted to cancel distortion signals ().