Patent ID: 6806763
Filing Date: 2004-10-19
Classification: G05F

Abstract:
An internal reference voltage generating circuit comprising:a reference voltage bias part connected between a power source voltage node and a ground voltage node, for establishing an initial value of an internal reference voltage on an internal reference voltage node when a power source voltage is applied to the power source voltage node; a reference voltage coding part connected to the reference voltage bias part, for increasing or decreasing the internal reference voltage in response to thermometer codes obtained from programmable binary codes; voltage-up controllers connected between the power source voltage node and the internal reference voltage node, or increasing the internal reference voltage in response to the thermometer codes; voltage-down controllers connected between the internal reference voltage node and the ground voltage node, for decreasing the reference voltage in response to the thermometer codes; wherein the voltage-up controllers each comprise: an inverter connected between the power source voltage node and the internal reference voltage node and controlled by the thermometer codes; and a transistor connected between the power source voltage node and the internal reference voltage node, for increasing the internal reference voltage in response to outputs of the inverter.