Patent ID: 6972550
Filing Date: 2005-12-06
Classification: G05F

Abstract:
1. A bandgap voltage reference generator for providing a reference voltage, wherein said bandgap voltage reference generator comprises: a first current mirror, responsive to an input current of said first current mirror for generating a first output current at a first output node of said first current mirror and a second output current at a second output node of said first current mirror, wherein said second output node is coupled to an output of said bandgap voltage reference generator for generating said reference voltage at said output node, wherein said output node is coupled to a first potential through a first electric network; a second current mirror, including a first node, a second node, a third node and a fourth node, wherein said first node is said first output node, and responsive to said first output current for generating an input current of said second current mirror flowing through said first node to said second node to mirror an output current of said second current mirror flowing through said third node to said fourth node, wherein said second node is coupled to said first potential through a second electric network, and said fourth node is coupled to said first potential through a third electric network; and a startup circuit, comprising a first voltage controlled current source device having two ends, wherein one end of said first voltage controlled current source device is coupled to a second potential, while the other end of said first voltage controlled current source device is coupled to said third node, and wherein said first voltage controlled current source device is controlled by a voltage difference between said first node and said third node for generating a pulling current to pull said first node of said second current mirror and said third node to be substantially the same, wherein said second potential is equal to said first potential in voltage.