Patent ID: 6657467
Filing Date: 2003-12-02
Classification: H03K,H03L

Abstract:
A semiconductor device including an internal circuit, said semiconductor device comprising:delay means for delaying an input signal by a delay time caused by a delay component on a critical path of said internal circuit by delay-amount-selecting means included in the delay means and, thereby, generating a delayed signal; reference-signal-generating means, having a delay component identical with a delay component of said delay-amount-selecting means, for generating a reference signal delayed in phase by one cycle of an internal operating-clock signal in comparison with said input signal; phase-difference-detecting means for detecting a phase difference between said reference signal and said delayed signal; and power-supply voltage adjusting means for adjusting the magnitude of a power-supply voltage supplied to said internal circuit according to said phase difference detected by said phase-difference-detecting means.