Patent ID: 7821324
Filing Date: 2010-10-26
Classification: G05F

Abstract:
1. A reference current generating circuit comprising: a reference voltage circuit supplying a reference voltage having a constant level regardless of a temperature variation; a reference resistor circuit comprising a resistor having a positive temperature coefficient and a resistor having a negative temperature coefficient that are connected in series, the reference resistor circuit having a constant total resistance regardless of the temperature variation; and a current mirror circuit generating a mirror current corresponding to a reference current to output the mirror current to an outside, wherein the reference current having a constant level regardless of the temperature variation is generated by the reference voltage and the resistance of the reference resistor circuit, wherein the reference voltage circuit comprises an operational amplifier where a voltage having a constant level regardless of a temperature variation is received from an external source through an inverting terminal, and a non-inverting terminal is connected to one end of the reference resistor circuit, wherein the current mirror circuit comprises: