Patent ID: 8217821

Claim:
A reference signal generator circuit, comprising: a first reference terminal and a second reference terminal, the first reference terminal structured to receive a first reference signal; a filtering circuit arranged between the first reference terminal and the second reference terminal, the filtering circuit structured to filter a disturbance on the first reference signal and to supply at output on the second reference terminal a filtered reference signal, the filtering circuit including a first diode element and a first switch circuit each coupled between the first and second reference terminals; a control circuit structured to actuate the first switch circuit in a first operative condition of low-impedance conduction in which the first switch circuit constitutes a low-impedance coupling between the first reference terminal to the second reference terminal during startup of the reference signal generator circuit and in a second operative condition of high impedance in which the first switch circuit acts as a second diode element in antiparallel with the first diode element and provides a high-impedance connection between the first reference terminal and the second reference terminal once startup is terminated.