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:
May. 21, 2002
Filed:
Apr. 27, 2000
Method for linearizing, over a wide frequency band a transmission chain comprising a power amplifier
Luc Dartois, Carrieres sous Poissy, FR;
Alcatel, Paris, FR;
Abstract
The invention concerns a transmission equipment for a telecommunication system operating on a wide frequency band, which equipment contains: a signal branch ( ) including an analog chain ( ′), a power amplifier ( ′) associated to a feedforward linearization circuit including: a first subtractor ( ′) having a first input ( ) receiving a signal representing the input of the amplifier and a second input ( ) representing the output of this amplifier, residual error amplifier ( ′) which amplifies the output of the first subtractor, and a second subtractor ( ′) which subtracts the output of the residual error amplifier from the output of the power amplifier ( ′), the signal branch containing predistortion means ( ) which provide correction signals depending on the output signal of the power amplifier. The equipment contains a reference branch ( ) providing, to the first input ( ) of the first subtractor ( ′), a signal which is independent from the predistortion of the signal branch.