Patent ID: 7782123

Claim:
A semiconductor integrated circuit comprising: a first current mirror circuit connected to a first voltage supply node supplied with a first voltage; a second current mirror circuit connected to a second voltage supply node supplied with a second voltage lower than the first voltage, and connected to the first current mirror circuit through a first node and a second node for introducing current from the first current mirror circuit; and a start-up section comprising: a first transistor comprising a control terminal supplied with the voltage of the first node, a first terminal supplied with the first voltage, and a second terminal connected to a third node for introducing current according to the voltage of the first node; a second transistor comprising a control terminal supplied with the second voltage, a first terminal connected to the third node, and a second terminal connected to a fourth node for introducing current according to the potential of the second voltage supply node, the second transistor having a specific value for a threshold value representing the size of voltage supplied to the control terminal conduct a current of a specific amount between the first terminal and the second terminal; a third transistor comprising a control terminal connected to the fourth node, a first terminal supplied with the first voltage, and a second terminal connected to the second node, the threshold value of the third transistor being smaller than the specific value; and a capacitance element, one terminal thereof being connected to the fourth node and the other terminal thereof being connected to the second voltage supply node.