Patent ID: 7692479

Claim:
A semiconductor integrated circuit device, comprising: a charge pump circuit flowing an operating current therethrough; a current circuit adapted to receive said operating current and a substantially constant current and generate an inverse current relative to said operating current and said substantially constant current; a constant current source for generating said substantially constant current circuit; and first and second power supply lines, said first power supply line being connected to said charge pump circuit and said constant current source, said current circuit comprising: a first current mirror circuit having a first input current terminal connected to said charge pump circuit and a first output current terminal connected to said constant current source; and a second current mirror circuit having a second input current terminal connected to said constant current source and a second output current terminal, wherein, said first current mirror circuit comprising: a first transistor connected between said charge pump circuit and said second power supply line; and a second transistor connected between said constant current source and said second power supply line, said first and second transistors having a first common control terminal, said second current mirror circuit comprising: a third transistor connected between said constant current source and said second power supply line; and a fourth transistor connected between said first and second power supply lines, said third and fourth transistors having a second common control terminal, wherein the semiconductor integrated circuit device further comprises a voltage clamp circuit connected between said first and second power supply lines and connected to said charge pump circuit and said first transistor.