Amplifier modulation

G - Physics – 06 – K

Patent

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Details

G06K 7/00 (2006.01) H03F 3/217 (2006.01)

Patent

CA 2462985

In general, the invention is directed to an efficient amplifier for use in radio-frequency identification (RFID) applications. In particular, the invention provides a highly efficient amplifier that requires little power, yet has significant modulation bandwidth to achieve high data communication rates. The amplifier makes use of many components of a class E amplifier including a first transistor, an inductor coupling the first transistor to a power supply, and a shunt capacitor connected in parallel to the first transistor. A second transistor is connected in parallel to the first transistor. A controller selectively controls the first and second transistors to achieve amplitude modulation at a high modulation bandwidth.

L'invention concerne, d'une manière générale, un amplificateur efficace pouvant servir dans des applications d'identification par fréquence radio (RFID). En particulier, l'invention concerne un amplificateur hautement efficace qui nécessite peu d'énergie, mais qui dispose d'une largeur de bande de modulation importante permettant d'obtenir des vitesses de communication de données élevées. L'amplificateur fait appel à de nombreux composants d'un amplificateur de classe E comportant un premier transistor, une bobine d'induction couplant le premier transistor à une alimentation, et un condensateur shunt relié en parallèle au premier transistor. Un second transistor est relié en parallèle au premier transistor. Un contrôleur commande de manière sélective les premier et second transistors pour obtenir une modulation d'amplitude à une largeur de bande de modulation élevée.

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