Patent ID: 7557428
Filing Date: 2009-07-07
Classification: H01L,H03K

Abstract:
1. A semiconductor integrated circuit, comprising: a circuit element which constitute a circuit of the semiconductor integrated circuit, the circuit element being formed over a surface of a semiconductor substrate of a first conduction type and being insulated from the substrate; a well of a second conduction type different from the first conduction type formed in an area of a surface of the semiconductor substrate under the circuit element; and a second well of the second conduction type in which a transistor, which constitutes the circuit, is formed in the surface of the semiconductor substrate, wherein the well has a higher resistivity than a resistivity of the second well; wherein a constant voltage, which biases a junction between the well and the semiconductor substrate in a reverse direction, is applied to the well through a resistor having a higher impedance compared with an impedance of a capacitance of the reverse-biased junction between the well and the substrate at a frequency of a signal applied to the element during an operation of the circuit.