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. 23, 2002
Filed:
Sep. 12, 2000
Warren Guthrie, West Olive, MI (US);
Netcom, Inc., Wheeling, IL (US);
Abstract
An amplifier and method of canceling distortion in an amplified signal. The amplifier includes a main amplifier operable to receive a main input signal and generate an amplified signal having a main component and an error component. The amplifier also includes a plurality of error correction amplifiers coupled in a feed-forward arrangement to the main amplifier and operable to receive an input signal and to generate a plurality of output signals, each having a main component and an error component. A balancing network is coupled to the main amplifier and to the plurality of error canceling amplifiers. The balancing network isolates a sample of the output signal of the main amplifier, inverts the sample, and combines the sample with the input signal to the error correction amplifiers. An N+1, unequal combiner combines the output signal from the main amplifier and the output signals of the error correction amplifiers such that the error components of the output signals substantially cancel one another and the main components of the output signals are added to one another. The method involves dividing an input signal into a first component and a second component, amplifying the first component of the input signal to create an output signal, sampling the output signal to create a sampled signal, combining the sampled signal and the second component of the input signal to create a combined signal, amplifying the combined signal using a plurality of error correction amplifiers to create a plurality of correction signals; and combining the output signal and the correction signals in an unequal combiner to create an amplified signal.