Patent ID: 7372243
Filing Date: 2008-05-13
Classification: G05F

Abstract:
1. A reference voltage circuit comprising: first and second current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage; a control circuit that exercises control in such a manner that a prescribed output voltage of said first current-to-voltage converting circuit and a prescribed output voltage of said second current-to-voltage converting circuit will become equal; a first current mirror circuit that has a non-linear input/output characteristics and supplies currents to respective ones of said first and second current-to-voltage converting circuits; a second current mirror circuit that has a linear input/output characteristic, and outputs a current which is proportional to a value of the current supplied to said first current-to-voltage converting circuit; a third current mirror circuit that has a linear input/output characteristic, and outputs a current which is proportional to the value of the current supplied to said second current-to-voltage converting circuit; and a third current-to-voltage converting circuit that receives a current which is the result of adding an output current from said second current mirror circuit and an output current from said third current mirror circuit and converts the current to a voltage which is supplied as a reference voltage.