Patent ID: 8847565
Filing Date: 2014-09-30
Classification: G05F

Abstract:
1. An apparatus comprising: a first resistor coupled between a voltage supply line subject to voltage fluctuations and a bandgap voltage supply line; a bandgap reference voltage circuit coupled to the bandgap voltage supply line and configured and arranged to provide a bandgap reference voltage output; a second resistor coupled, via the bandgap voltage supply line, to the first resistor and the bandgap reference voltage circuit; a first circuit configured and arranged to shunt current between the bandgap voltage supply line and a ground circuit, the first circuit including a second circuit coupled between the second resistor and the ground circuit, the second circuit being configured and arranged to provide a startup voltage for the bandgap reference voltage circuit by mitigating current flow via the first circuit in response to a voltage level on the bandgap voltage supply line that is less than a minimum voltage at which the bandgap reference circuit can operate.