WIDLAR TYPE REFERENCE VOLTAGE GENERATOR OF SEMICONDUCTOR MEMORY DEVICE, ESPECIALLY MINIMIZING REFERENCE VARIATION

PURPOSE: A widlar type reference voltage generator of a semiconductor memory device is provided to reduce the variation of a reference voltage according to the variation of a power supply voltage. CONSTITUTION: A widlar type first reference voltage generation unit(30) generates the first reference voltage. A differential amplification unit(31) compares the second reference voltage with the first reference voltage having a constant voltage level as to a power supply port and then generates an output voltage according to the comparison result. A driver unit(32) generates the second reference voltage in response to the output voltage. And a decoupling unit(34) is connected between an output port of the driver unit and a ground voltage port to maintain a constant voltage level of the second reference voltage without regard to power noise.