Patent ID: 7005909

Claim:
A level shifter f or receiving input voltage signals alternately having a first level voltage and a second level voltage, and generating a third level voltage and a fourth level voltage respectively according to the first level voltage and the second level voltage, comprising: an input end for receiving the input voltage signals; an output end for outputting the third level voltage and the fourth level voltage; a first transistor coupled between a first power source having a fifth level voltage and the output end, and having a gate for receiving the input voltage signals from the input end; a second transistor coupled between the output end and a second power source having a sixth level voltage; a capacitance component formed between the output end and a gate of the second transistor; and a third transistor having a first electrode coupled between the gate of the first transistor and the input end, a second electrode coupled to the gate of the second transistor, and a gate coupled to the first electrode of the third transistor, wherein the third transistor is a switching element for applying a voltage corresponding to the first level voltage to the gate of the second transistor in response to the first level voltage, and cutting off the input voltage signals and the gate of the second transistor electrically in response to the second level voltage, wherein the output end is coupled between the first transistor and the second transistor to output the third level voltage and the fourth level voltage.