H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/155 (2006.01) H04B 1/62 (2006.01)
Patent
CA 2289511
The present invention relates to a method and to a signal predistorter circuit for eliminating the nonlinearities in the input/output characteristics of nonlinear stages, in particular for eliminating the third-order nonlinearities. More particularly, it relates to a method and to a predistorter circuit for external optical modulators of television signals. The method for predistortion of a signal of variable amplitude comprises the phases of: delivering the said signal to at least one first distorter circuit; biasing the said at least one first distorter circuit; distorting the said signal in the said at least one first distorter circuit; characterized in that the said phase of biasing the said at least one first distorter circuit comprises the phase of maintaining a substantially constant preset voltage value on varying the amplitude of the said signal at the said at least one first distorter circuit.
La présente invention concerne un procédé et un circuit de pré-distorsion des signaux pour éliminer les non linéarités des caractéristiques d'entrée/sortie des étages non linéaires, en particulier, pour supprimer les non linéarités de troisième ordre. Plus particulièrement, l'invention traite d'un procédé et d'un circuit de pré-distorsion pour des modulateurs optiques externes de signaux de télévision. Le procédé selon l'invention pour la pré-distorsion d'un signal d'une amplitude variable comprend les phases consistant à fournir ce signal à au moins un premier circuit de distorsion; polariser ce circuit; assurer la distorsion de ce signal dans ce premier circuit de distorsion au moins. Ce procédé se caractérise en ce que la phase de décalage de ce premier circuit de distorsion au moins consiste à maintenir une tension préréglée sensiblement constante lors de la variation de l'amplitude de ce signal sur ce premier circuit de distorsion au moins.
Gobetti Gianluca
Mussino Franco
Notargiacomo Massimo
Ravasio Giuseppe
Zammarchi Claudio
Corning O.t.i. Inc.
Kirby Eades Gale Baker
Pirelli Cavi E. Sistemi S.p.a.
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