LEVEL SHIFT CIRCUIT FOR STEPPING UP LOGIC SIGNAL AMPLITUDE WITH IMPROVED OPERATING SPEED

摘要

is an object of the present invention is to provide a level shift circuit that operates at a higher speed . ; VDD1 & between VDD2 of the power source potential (VDD2) and the reference potential (VSS) PMOS transistors constituting the first inverter is connected between (P1) and an NMOS transistor (N1S), also an NMOS transistor (N3 and NS3) are connected in series , and between the PMOS transistors constituting the second inverter in the same way (P2) and the NMOS transistor (N2S), is also an NMOS transistor (N4 and N4S) are connected in series . A gate insulating film of the PMOS transistor (P1, P2) and an NMOS transistor (N3 and N4) is thicker than the gate insulating film of the NMOS transistor (N1S~N4S). The gate of the NMOS transistor (N3 and N4) is connected to the VDD2, the gate of the NMOS transistor (N3S and N4S) is connected to the VDD1, the transistors are always turned on .