Voltage-to-current converter

H - Electricity – 02 – M

Patent

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Details

H02M 5/275 (2006.01) G05F 1/56 (2006.01) H03M 1/12 (2006.01)

Patent

CA 2253750

A voltage-to-current converter for converting an input voltage signal into an output current signal, while providing a filtering function. The input voltage signal is converted to an intermediate current signal by an input resistance and an equivalent resistance provided by, for example, an inverting amplifier and a transistor. A current mirror having a dominant pole converts the intermediate current signal to the output voltage signal, and provides low pass filtering. The converter avoids the use of linear capacitors, and can be easily implemented in a CMOS device.

La présente invention concerne un convertisseur tension-courant permettant de convertir une tension de signal d'entrée en un courant de signal de sortie, tout en assurant une fonction de filtrage. Le procédé consiste à faire convertir la tension de signal d'entrée en tension de signal intermédiaire par une résistance d'entrée et par une résistance équivalente formée par exemple d'un amplificateur inverseur et d'transistor. Un miroir de courant à pôle dominant convertit le courant de signal intermédiaire en tension de signal de sortie, et assure une fonction de filtre passe-bas. Ce convertisseur, qui évite l'emploi de condensateurs linéaires, convient particulièrement aux mises en oeuvre dans des circuits CMOS.

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