Patent ID: 7605633

Claim:
A level shift circuit comprising: first conductivity type first and second transistors having a current path whose one end is supplied with a second voltage higher than a first voltage corresponding to a high level of an input signal, each gate of the first and second transistors being cross-connected with the other end of the current path; a first conductivity type third transistor interposed between the other end of the current path of the first transistor and a first connection node connecting the other end of the first transistor and a gate of the second transistor, a gate of the third transistor being supplied with a constant voltage, one end of the current path and a back gate being connected; a first conductivity type fourth transistor interposed between the other end of the current path of the second transistor and a second connection node connecting the other end of the second transistor and a gate of the first transistor, a gate of the fourth transistor being supplied with a constant voltage, one end of the current path and a back gate being connected; second conductivity type fifth and sixth transistors interposed and connected between the first and second connection nodes and ground, each gate of the fifth and sixth transistors being complementarily supplied with the input signal; an output terminal connected to the first connection node; first conductivity type seventh and eighth transistors connected to each back gate of the third and fourth transistors, the seventh and eighth transistors supplying a constant voltage to each back gate of the third and fourth transistors when the third and fourth transistors are off; and first conductivity type ninth and tenth transistors connected between one end of the current path of the first and second transistors and a node supplied with the second voltage, the ninth and tenth transistors including gates being complementarily supplied with the input signal.