Patent ID: 6680643
Filing Date: 2004-01-20
Classification: G05F

Abstract:
A bandgap type reference voltage source, comprising:a bandgap stage having a first and a second output node and a control input, said bandgap stage comprising first and second bandgap branches, parallel-connected, said first bandgap branch comprising a first diode element and a first control element series-connected and forming, at a connection between the first diode element and the first control element, said first output node, said second bandgap branch comprising a second diode element and a second control element series-connected and forming, at a connection between the second diode element and the second control element, said second output node; an operational transimpedance amplifier having inputs connected to said output nodes of said bandgap stage and an output connected to the control input of said bandgap stage, said operational transimpedance amplifier comprising a first and second current input connected to said first and said second output nodes of said bandgap stage, respectively, and a first and a second output terminal; an amplifier current detecting stage connected to said first and second output terminals of said operational transimpedance amplifier and having an output supplying a first quantity related to a current flowing in said first current input of said operational transimpedance amplifier; and a diode current detecting stage having a first input connected to said output of said current detecting stage, a second input connected to said second output terminal of said operational transimpedance amplifier and having an output supplying a second quantity related to a current flowing in said first diode element.