Complementary MOS semiconductor device

A complementary MOS semiconductor device comprising:

• a complementary MOS logic circuit having a plurality of field effect transistors each having a gate insulating film less than 2.5 nm thickness;
• a first wiring and a second wiring electrically connected as a source to supply therethrough a power source voltage to the complementary MOS logic circuit;
• a first power supply circuit, electrically connected to said first wiring and to said complementary MOS logic circuit, to control the supply of the power source voltage from said first wiring to said complementary MOS logic circuit;
• a second power supply circuit, electrically connected to said second wiring and said complementary MOS logic circuit, to control the supply of the power source voltage from said second wiring to said complementary MOS logic circuit;
• and
• a third power supply circuit, electrically connected to said first power supply circuit, to control the operation of said first power supply circuit, wherein said third power supply circuit comprises field effect transistors each having a gate insulating film with 2.5 nm or more thickness,
• wherein wells of said field effect transistors which are provided in said complementary MOS logic circuit are electrically insulated from said first wiring and said second wiring.