초록 ▼

A semiconductor integrated circuit has a logic circuit operated at a small power supply voltage of about 0.5V, wherein a noise margin of the logic circuit can be set at a larger value even if characteristics of the circuit vary depending upon manufacturing process conditions. Satisfactory speed can

A semiconductor integrated circuit has a logic circuit operated at a small power supply voltage of about 0.5V, wherein a noise margin of the logic circuit can be set at a larger value even if characteristics of the circuit vary depending upon manufacturing process conditions. Satisfactory speed can be ensured during an operation and power consumption can be reduced during a stand-by time. This is attained by controlling individual potentials of first and second conductivity type wells in which a logic circuit is formed. For this purpose, two voltage supply circuits for controlling voltages of the wells and a logic threshold voltage generator are provided.

대표청구항 ▼

1. A semiconductor integrated circuit comprising:a semiconductor substrate having a first well of a first conductivity type, a second well of a first conductivity type, a first well of a second conductivity type, and a second well of a second conductivity type; a complementary MIS logic circuit havi

1. A semiconductor integrated circuit comprising:a semiconductor substrate having a first well of a first conductivity type, a second well of a first conductivity type, a first well of a second conductivity type, and a second well of a second conductivity type; a complementary MIS logic circuit having first elements formed in the first well of the first conductivity type and second elements formed in the first well of the second conductivity type; a logic-threshold-voltage generator for generating a voltage corresponding to a logic threshold voltage of the complementary MIS logic circuit, having a third element formed in the second well of the first conductivity type and a fourth element formed in the second well of the second conductivity type; a first voltage supply circuit for supplying a first voltage V having a magnitude between a first and a second power supply voltage to the complementary MIS logic circuit, wherein the second power supply voltage is a reference voltage and different from the first power supply voltage; a differential amplification circuit wherein an output voltage of the logic-threshold-voltage generator is input to a positive terminal of the differential amplification circuit and wherein the first voltage V is input to a negative input terminal of the differential amplification circuit; and a second voltage supply circuit for supplying a second voltage Vx, wherein an output voltage of the differential amplification circuit is supplied to the first well of the first conductivity type wells in which the first elements of the complementary MIS logic circuit are formed, and supplied to the second well of the first conductivity type, in which the third element of the logic-threshold-voltage generator is formed; and the second voltage s supplied to the first well of the second conductivity type in which the second elements of the complementary MIS logic circuit are formed and supplied to the second well of the second conductivity type, in which the fourth element of the logic-threshold-voltage-generator is formed.