Patent ID: 6850112

Claim:
A control device for a generation circuit for reference voltages, comprising: a first P type MOS transistor, connected between a node to which a high voltage signal is applied and a first intermediate node, a second P type MOS transistor connected between the first intermediate node and a second intermediate node, and a third P type MOS transistor connected between the second intermediate node and the ground and with its grid connected to its drain, to supply a reference voltage on one of the said intermediate nodes, and wherein the control device further comprises means of controlling the said reference transistors, either in a first operating mode to force the first reference transistor to act as a current source, the second reference transistor to the blocked state and to short circuit the third reference transistor to the ground, or in a second operating mode to connect each of the said transistors as a diode, the grids and drains of the first and second transistors being connected as a function of a logical control signal.