Patent ID: 7417490

Claim:
An internal voltage generator of a semiconductor integrated circuit comprising: a first variable reference voltage generating unit configured to generate a first base reference voltage having a first change characteristic that a level of the first base reference voltage is elevated, lowered or maintained according to a temperature; a first level shifting unit configured to transform the first base reference voltage outputted by the first voltage variable reference voltage generating unit, into a first reference voltage for generating internal voltage and to output the first reference voltage; a first internal voltage generating unit configured to generate an internal voltage using the first reference voltage for generating internal voltage outputting by the first level shifting unit; a second variable reference voltage generating unit configured to generate a second base reference voltage having a second change characteristic that a level of the second base reference voltage is elevated, lowered or maintained according to a temperature; a second level shifting unit configured to transform the second base reference voltage outputted by the second variable reference voltage generating unit, into a second reference voltage for generating internal voltage and to output the second reference voltage; and a second internal voltage generating unit configured to generate an internal voltage using the second reference voltage for generating internal voltage outputted by the second level shifted unit, wherein the first change characteristic differs from the second change characteristic.