Semiconductor integrated circuit

摘要

In a semiconductor integrated circuit, respective semiconductor circuits are disposed in different regions partitioned in accordance with their operation probabilities per unit time, and a supply voltage and a threshold voltage are correlatively controlled in each region. A target value for controlling the threshold voltage is determined in accordance with the operation probability of the semiconductor circuit. A threshold voltage control circuit controls substrate voltages of p-type and n-type MOS transistors included in the semiconductor circuit so that the threshold voltage can be constant at the target value regardless of the temperature change occurring in use. Simultaneously, a supply voltage control circuit controls the supply voltage for the semiconductor circuit so that an objective operating frequency can be attained. As a result, a semiconductor integrated circuit with low power consumption can be obtained.