Patent ID: 7688055

Claim:
A reference voltage generator comprising: a preliminary reference voltage generation unit which generates a preliminary reference voltage which is inversely proportional to temperature; and a reference voltage generation unit which generates a reference voltage by dividing the preliminary reference voltage, wherein the reference voltage generation unit comprises: at least one resistor which is connected between the preliminary reference voltage and the reference voltage; at least one transistor which is connected between the reference voltage and a first internal node; and at least one second resistor which is connected between the first internal node and a ground, wherein a sum of a first resistance of the at least one transistor and a second resistance of the at least one second resistor is uniformly maintained and the first resistance and the second resistance can be selectively changed; Wherein the preliminary reference voltage generation unit comprises: a plurality of resistors which are connected to a power supply and a second internal node; and at least one transistor which is connected between the second internal node and the ground, wherein the preliminary reference voltage is output from one of a plurality of connection nodes among the resistors.