Patent ID: 7545174

Claim:
A level shift circuit outputting a signal by converting a low-voltage input signal having a voltage level of a first power supply into an output signal having a desired voltage level of a second power supply, the level shift circuit comprising: a first voltage shift circuit: a first inverter circuit; a second voltage shift circuit; and the first voltage shift circuit comprising: a first transistor having a source connected to the second power supply and a gate connected to one of a ground and the first power supply; a second transistor having a drain connected to a drain of the first transistor, a source connected to an input node, and a gate connected to the drain of the second transistor; and a first condenser having a first end connected to the gate and drain of the second transistor, and a second end connected to the source of the second transistor and the input node, the first inverter circuit comprising: a third transistor having a source connected to the second power supply, and a gate; and a fourth transistor having a drain connected to a drain of the third transistor, a gate connected to the gate and drain of the second transistor, and to the first end of the first condenser, and a source connected to the ground, the second voltage shift circuit comprising: a seventh transistor having a source connected to one of the first power supply providing the input signal and the second power supply, and a gate and a drain connected to each other and the gate of the third transistor; an eighth transistor having a drain connected to a gate of the eighth transistor as well as to the drain and gate of the seventh transistor; and a second condenser having a first end connected to the drain and gate of the seventh transistor and to the gate and drain of the eighth transistor, and a second end connected to at least one of the source of the eighth transistor and the input node, wherein the input signal is input from the input node into the source of the second transistor.