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. 10, 2001
Filed:
Dec. 27, 1999
Nortel Networks Limited, Montreal, CA;
Abstract
A feed forward power amplifier has a main amplifier and an error compensation path that compares the input and output of the main amplifier and subsequently adjusts the output signal from the main amplifier. Currently, such a design requires the implementation of a delay apparatus to delay the output of the main amplifier in order to compensate for the delay within the error compensation path. This delay apparatus implemented within a high-power area costs the power amplifier in terms of money, size, and/or efficiency. With the implementation of a phase compensation filter within the error compensation path, the delay apparatus can be removed. The phase compensation filter has a frequency versus phase characteristic with a positive slope for a limited bandwidth and a constant frequency versus gain characteristic. This allows, for the limited bandwidth, the characteristic of the error compensation path to be similar to that of the undelayed output of the main amplifier. The use of a phase compensation filter within a feedback power amplifier can also have benefits, as the bandwidth of the power amplifier can be expanded.