Patent ID: 8610184

Claim:
A semiconductor integrated circuit device comprising: a substrate of a first conductivity type in which a first amplifier area and a second amplifier area are defined for a pair of amplifiers; a first well of a second conductivity type, a first pocket well of the first conductivity type that is electrically separated from the first well, and a first deep well of the second conductivity type, which surrounds the first pocket well and is adjacent to but electrically separated from the first well; and a second well of the second conductivity type, a second pocket well of the first conductivity type that is electrically separated from the second well, and a second deep well of the second conductivity type, which surrounds the second pocket well, and is adjacent to but electrically separated from the second well, wherein the first well, the first pocket well, and the first deep well are formed in the first amplifier area of the substrate, and the second well, the second pocket well, and the second deep well are formed in the second amplifier area of the substrate, and wherein the second well is connected to a high median power supply circuit potential and each of the first deep well and the first pocket well are connected to a low median power supply circuit potential.