Patent ID: 6392482
Filing Date: 2002-05-21
Classification: H03F

Abstract:
A transmission equipment for a telecommunication system operating on a wide frequency band, this equipment comprising:a signal branch (32) including a first analog chain (12â€²), a power amplifier (14â€²) associated with a feedforward 1 linearization circuit including: a first subtractor (16â€²) having a first input (16â€²2) receiving a signal representing the input of the amplifier and a second input (16â€²1) representing the output of this amplifier, a residual error amplifier (20â€²) which amplifies the output of the first subtractor, and a second subtractor (22â€²) which subtracts the output of the residual error amplifier from the output of the power amplifier (14â€²), the signal branch comprising first digital & adaptive predistortion means (40) which provide correction signals depending on the output signal 10â€²1 of the power amplifier, characterized in that said equipment comprises a reference branch (30) providing, to the first input (16â€²2) of the first subtractor (16â€²) of the feedforward circuit linearizing the power amplifier (14â€²), a signal which is independent from the predistortion of the signal branch, both the reference & the signal branch being fed with a same digital input stream (S) of baseband signal to be modulated and amplified.