JPS55100750A - Digital phase control oscillator - Google Patents

Abstract

PURPOSE:To regenerate an accurate and stable timing signal by detecting a specific phase of an input signal by a differentiating circuit and delay circuit and then by inputting the output to a phase comparator. CONSTITUTION:Slicer circuits 11...14 slice input analog base-band signal a' at a reference level and then output it to level decision gate 15. While differentiating circuit 16 opereates in the rising direction, differenciating circuit 17 is put into operation in the falling direction, and monostable multivibrators 18 and 19 are triggered respectively in the rising and falling directions to generate delay outputs. Then, a specific phase of the input signal is detected by the differential output of the input signal by circuits 16 and 17 and the delay output of the input signal by circuits 18 and 19 and the output is inputted to a phase comparator added to phase control oscillator 23. Consequently, the suppression value of the jitters is set large, so that an accurate and stable timing signal can be regenerated.