Patent ID: 8134814
Filing Date: 2012-03-13
Classification: H01L,H03K

Abstract:
1. A semiconductor integrated circuit, comprising: a first transistor which has a source-drain route connected between an external terminal and a first voltage, and a gate terminal connected to the first voltage; a second transistor which has a source-drain route connected between the external terminal and a second voltage, and a gate terminal connected to the second voltage; a third transistor which has a source-drain route connected between the external terminal and the first voltage, and a gate terminal; a fourth transistor which has a source-drain route connected between a first terminal and the first voltage, and a gate terminal connected to the first voltage; a fifth transistor which has a source-drain route connected between the first terminal and the second voltage, and a gate terminal connected to the second voltage; a sixth transistor which has a source-drain route connected between the first terminal and the first voltage, and a gate terminal; and an operational amplifier which includes a first input terminal connected to the first terminal, and a second input terminal connected to a second terminal, the operational amplifier generating a third voltage between the first voltage and the second voltage, and an output terminal, wherein the gate terminal of the third transistor and the gate terminal of the sixth transistor are connected to the output terminal of the operational amplifier.