Patent ID: 7659705

Claim:
A bandgap voltage reference circuit, comprising: a bandgap voltage generation circuit configured to produce a bandgap reference voltage in response to an activation voltage signal, the bandgap voltage generation circuit comprising: a first diode; a first resistor serially connected with the first diode at a first node, wherein the bandgap reference voltage is defined by the voltage across the first diode and the first resistor; and a first transistor configured to control current flow from a high-voltage supply terminal VDD to a low-voltage supply terminal VSS through the first diode and the first resistor; an one-shot pulse generator circuit configured to produce an one-shot voltage pulse; and a start-up circuit configured to produce the activation voltage signal in response to the one-shot voltage pulse, the start-up circuit comprising: a second transistor having a gate connected with the output of the one-shot pulse generator circuit; and a third transistor cascode-connected at a second node and between VDD and VSS, wherein the third transistor has a gate connected to the first node.