Patent ID: 6404232
Filing Date: 2002-06-11
Classification: H01L,H03K

Abstract:
A semiconductor integrated circuit device comprising:a logical circuit including a MIS transistor formed on a semiconductor substrate; a control circuit for controlling a threshold voltage of the MIS transistor forming said logical circuit; an oscillation circuit including a MIS transistor formed on said semiconductor substrate, said oscillation circuit being constructed so that the frequency of an oscillation output thereof can be made variable; and a buffer circuit; in which said control circuit is supplied with a clock signal having a predetermined frequency and the oscillation output of said oscillation circuit so that said control circuit compares the frequency of said oscillation output and the frequency of said clock signal to output a first control signal; said oscillation circuit is controlled by said first control signal so that the frequency of said oscillation output corresponds to the frequency of said clock signal, the control of the frequency of said oscillation output being performed in such a manner that said first control signal controls a threshold voltage of the MIS transistor forming said oscillation circuit; and said buffer circuit is constructed so that it is inputted with said first control signal to output a second control signal corresponding to said first control signal, said second control signal controlling the threshold voltage of the MIS transistor forming said logical circuit.