Patent ID: 7038440

Claim:
A closed loop bandgap voltage generator for generating a stable output voltage on an output node thereof, and comprising: a current mirror coupled between the output node and a voltage reference, said current mirror comprising an output branch coupled to the output node, an output transistor coupled to said output branch, and an input transistor configured as a diode coupled to said output transistor; a biasing transistor coupled to said output branch; a feedback line comprising a first feedback transistor coupled to said output branch and cooperating with said biasing transistor for keeping constant a conducting terminal voltage of said output transistor, said first feedback transistor being dimensioned to have a control terminal/conducting terminal voltage substantially the same as a control terminal/conducting terminal voltage of said input transistor; a current generator for biasing said first feedback transistor by injecting a current into a bias node of said feedback line; a noise filtering capacitor coupled between the bias node and the voltage reference; and said feedback line comprising a circuit coupled between the bias node and said first feedback transistor for causing a current to flow through said first feedback transistor, and for increasing a resistance of a portion of said feedback line in parallel to said noise filtering capacitor.