H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/38 (2006.01) H03F 99/00 (2009.01) H03F 3/217 (2006.01) H03M 3/02 (2006.01)
Patent
CA 2380324
Methods and apparatus are described for reducing or eliminating break-before- make, i.e. dead time distortion, in switching amplifiers. A switching amplifier (M1, M2) has an input stage (510) for generating a switching signal. Break-before-make distortion compensation circuitry (504) alters the switching signal. Break-before-make generator circuitry (506) generates two drive signals from the altered switching signal. A power stage includes two switches (D1, D2) which are alternately driven by the two drive signals. Break-before- make distortion detection circuitry (502) detects a distortion pattern at the power stage output node and controls the break-before-make distortion compensation circuitry (504) to alter the switching signal in response to the distortion pattern detected to thereby eliminate at least some break-before- make distortion.
Cette invention concerne des procédés et un dispositifs permettant de réduire ou d'éliminer des distorsions sans chevauchement, c'est à dire des distorsions temps mort, dan des amplificateurs de commutation. Dans un amplificateur de commutation (M1, M2), un étage d'entrée (510) produit un signal de commutation. Un circuit de compensation de distorsion sans chevauchement (504) modifie le signal de commutation. Un circuit générateur de contact sans chevauchement (506) génère deux signaux d'excitation à partir du signal de commutation modifié. Un étage de puissance comprend deux commutateurs (D1, D2) qui sont commandés en alternance par les deux signaux d'excitation. Un circuit de détection de distorsion sans chevauchement (502) détecte un mode de distorsion au niveau du noeud d'entrée de l'étage de puissance et commande au circuit de compensation de distorsion sans chevauchement (504) de modifier le signal de commutation en réponse au schéma de distorsion détecté afin de supprimer au moins une partie de la distorsion sans chevauchement.
Delano Cary L.
Miao Guoqing
Oyen Wiggs Green & Mutala Llp
Tripath Technology Inc.
LandOfFree
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