Voltage controlled variable current reference

Details Voltage controlled variable current reference Voltage controlled variable current reference

H - Electricity

03

K

H03K 19/094 (2006.01) G05F 1/10 (2006.01) G05F 3/26 (2006.01)

Patent

CA 2261733

A current source providing a voltage-controlled variable current reference is described which employs a conventional current mirror (20) to supply a current (Im) to a diode-connected transistor (22), and to a plurality of controllable current paths (30), wherein the controllable current paths (30) are controlled by voltages from a voltage sensing circuit (26) so that predetermined amounts of current are drawn away from the diode-connected transistor (22) as a function of a controlled voltage, so that the diode-connected transistor (22) generates a voltage as a function of the current (Im) flowing through it, which voltage is used to control an output transistor (12) and a current (Io) flowing through the output transistor (12).

On décrit une source de courant fournissant une référence de courant variable, commandé en tension, et dans laquelle on utilise un miroir de courant classique (20) pour fournir un courant (Im) à un transistor (22) monté en diode, ainsi qu'à une pluralité de trajets de courant pouvant être commandés (30). L'invention est caractérisée en ce que ces trajets (30) sont commandés par des tensions provenant d'un circuit de détection de tension (26) de façon que des quantités déterminées de courant soit éloignées du transistor monté en diode (22) en fonction de la tension commandée, de sorte que ce transistor (22) produise une tension en fonction du courant (Im) le traversant, laquelle tension sert à commander un transistor de sortie (12) et un courant (Io) circulant à travers ce transistor de sortie (12).

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