JPS54124915A - Phase controller - Google Patents

Abstract

PURPOSE:To remove disturbance caused by noises by controlling a reference timing signal to a fixed phase, by generating a stop signal by receiving data and the reference timing signal by comparing the phase of a conversion signal with that of the reference timing by a phase comparator circuit. CONSTITUTION:By detecting the voltage change point of a receiving data signal, change point detection circuit 2 outputs a change point signal, and reference timing generating circuit 5 generates a reference timing signal under the control with the phase either advanced or delayed by a control signal for phase advancing, phase-delaying or stopping. For the purpose, phase comparator circuit 3 compares the phase of a conversion signal with that of the reference timing signal; and the reference timing generating circuit is supplied with a phase-advancing control signal when the conversion signal leads or a phase delaying control signal when lagging, so that stop signal generating circuit 4 will generate a stop signal controlled by the receiving data signal and reference timing signal. Consequently, the reference timing signal can be controlled to a fixed phase in order to remove disturbance caused by noises, etc.