Patent ID: 6313622
Filing Date: 2001-11-06
Classification: H03K,H03L

Abstract:
A power source voltage controller comprising:a semiconductor circuit having a critical path and operating by receiving a power source voltage supply;a replica circuit coupled to the semiconductor circuit and having a power source voltage-delay characteristic approximately equivalent to that of the critical path of said semiconductor circuit, wherein the replica circuit receives a reference signal as an input, propagates said reference signal and outputs a delay signal;a phase difference detection circuit for receiving the delay signal from said replica circuit and said reference signal, having a delay time monitor gauge for detecting a phase difference of the delay signal from the reference signal, and outputting the detection result as phase difference information corresponding to a delay time of the critical path of said semiconductor circuit; anda voltage control circuit for generating a voltage value based on the phase difference information from said phase difference detection circuit and supplying the same to said semiconductor circuit and the replica circuit.