Data output buffer with high drivability in semiconductor device

Abstract

Disclosed is a data output buffer improving the drivability, by increasing the power supply voltage and keeping the power supply voltage constant, without being modification and increase of the manufacturing process of the device. Furthermore, the improvement of the drivability may increase the speed of the data output buffer and decrease the chip area. The data output buffer according to the present invention comprises a pull-up transistor coupled to a power supply for providing an output node of the data output buffer with a first voltage level, a pull-down transistor for providing the output node of the data output buffer with a second voltage level, a voltage comparator coupled to the output node for comparing an output signals from the output node with the first voltage level and for amplifying a difference voltage between the output signals from the output node and the first voltage level, and a voltage compensator couple to the voltage comparator for compensating a voltage level of the power supply in response to an output signal from the voltage comparator.

Dependencies are inferred from the claim text.