Bicmos switch circuit

H - Electricity – 03 – K

Patent

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Details

H03K 17/567 (2006.01) H03K 17/04 (2006.01) H03L 7/089 (2006.01) H03M 1/74 (2006.01) H03K 17/041 (2006.01)

Patent

CA 2323413

There is described a BiCMOS switch circuit which allows a low voltage CMOS signal to control a bipolar current source or sink circuit. The circuit includes a current mirror circuit, drawing a constant current through a first bipolar transistor. The collector of that transistor is connected firstly through a second bipolar transistor to a circuit output, and secondly through a CMOS transistor to a positive voltage supply. Depending on an input control signal supplied to the gate of the CMOS transistor, that device can be switched on or off. When the CMOS transistor is switched off, the constant current through the first bipolar transistor is drawn through the circuit output. When the CMOS transistor is switched on, the constant current through the first bipolar transistor is drawn through the CMOS transistor, and the output current is zero.

L'invention porte sur un circuit de commutation de type BiCMOS permettant de commander une source de courant bipolaire ou un circuit puits à l'aide d'un signal CMOS à basse tension. Le circuit BiCMOS comporte un circuit miroir de courant dirigeant un courant constant à travers un premier transistor bipolaire dont le collecteur est d'une part relié, via un deuxième transistor bipolaire, à un circuit de sortie, et d'autre part, via un transistor CMOS, à une source positive de tension. Selon le signal de commande d'entrée appliqué à la grille du transistor CMOS le dispositif peut être enclenché ou déclenché. Lorsque le transistor CMOS est déclenché, le courant constant traversant le premier transistor bipolaire est dirigé sur la sortie du circuit; lorsqu'il est déclenché, le courant constant traversant le premier transistor bipolaire est dirigé sur le transistor CMOS, et le courant de sortie est nul. On peut réaliser un convertisseur N/A en groupant plusieurs de ces circuits ayant en commun la moitié des circuits miroir, lesdits circuits présentant différents courants constants et recevant les différents bits d'un signal numérique sur leurs entrées de commande respectives.

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