Patent ID: 8525570

Claim:
A level shifter comprising: a first buffer amplifier transferring a preset reference voltage to a first output terminal; a second buffer amplifier transferring an input voltage to a second output terminal; a positive feedback amplifier connected in parallel to the first buffer amplifier and the second buffer amplifier, and amplifying the input voltage by a preset gain to transfer the amplified input voltage to a third output terminal; and a level regulation unit regulating levels of output signals of the first buffer amplifier, the second buffer amplifier, and the positive feedback amplifier and providing the regulated output signals to a common output nod; wherein the level regulation unit comprises: a first level regulator connected between the first output terminal of the first buffer amplifier and the common output node; a second level regulator connected between the second output terminal of the second buffer amplifier and the common output node; and a third level regulator connected between the third output terminal of the positive feedback amplifier and the common output node.