Even order distortion elimination in push-pull or...

H - Electricity – 03 – F

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H03F 1/26 (2006.01) H03F 1/32 (2006.01) H03F 3/26 (2006.01)

Patent

CA 2490940

A method for improving or eliminating second harmonic and higher even order distortion terms and balance of fundamental signals in push-pull amplifiers and other differential circuits is disclosed. A common-mode (CM) signal is generated as a sum of two complementary (out of phase) signals in a summation network (32). The CM signal contains even order distortion terms only, while the fundamental signal and odd order distortion terms are canceled, thus providing a correction signal that can be used to reduce even order distortion terms, by injecting the correction signal, with proper phase and amplitude, into suitable circuit nodes. For feedback (70), the correction signal is injected at the input (56, 58) of the amplifiers (16, 18), for feed-forward, it~s injected at the output. The correction signal can be amplified to higher levels and injected into the circuit, without affecting gain of fundamental signals; and can result in significant even order distortion improvements, and improved balance of complementary fundamental signals.

L'invention concerne un procédé pour améliorer ou éliminer des termes de distorsion d'ordre pair de seconde harmonique ou supérieure et équilibrer des signaux fondamentaux dans des amplificateurs symétriques et d'autres circuits différentiels. Un signal en mode commun (CM) est produit en tant que somme de deux signaux complémentaires hors-phase dans un réseau de cumul. Ledit signal CM contient des termes de distorsion d'ordre pair, tandis que le signal fondamental et des termes de distorsion d'ordre impair sont supprimés, ceci permettant d'utiliser un signal de correction pour réduire des termes de distorsion d'ordre pair par injection du signal de correction, à phase et amplitude propres, dans des noeuds de circuits appropriés. Pour la rétroaction, le signal de correction est injecté sur l'entrée des amplificateurs, pour la non rétroaction, il est injecté à la sortie. Le signal de correction peut être amplifié à des niveaux plus élevés dans le circuit, sans affecter le gain des signaux fondamentaux. Ledit procédé consiste à améliorer les termes de distorsion d'ordre pair de manière significative et permet d'équilibrer les signaux fondamentaux complémentaires.

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