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Title:
【発明の名称】位相同期検出回路
Document Type and Number:
Japanese Patent JP2718664
Kind Code:
B2
Abstract:
This invention relates to a phase coincidence detector for examining whether or not two input digital signals are coincident by utilizing a delay signal and an advance signal of a digital phase comparator which examines the phase difference between the two input digital signals and outputs the delay signal representing the delay of one of the input signals to the other and the advance signal representing the advance of one of the input signals to the other. Particularly, the output signals of the phase comparator, that is, the delay signal and the advance signal, are periodic pulse signals, and residual pulses having a small pulse width occur periodically even at the time of coincidence. The phase coincidence detector of this invention changes the delay and advance signals by a pulse width discrimination circuit for discriminating whether or not the phase difference between the two input signals is below a certain constant value, and samples the changed signals to output the in-phase and out-of-phase state as signals having different levels.

Inventors:
Junichi Nakagawa
Kimura Hideshi
Yoshitomo Kuwamoto
Ienaka Masanori
Hideaki Watanabe
Application Number:
JP11738386A
Publication Date:
February 25, 1998
Filing Date:
May 23, 1986
Export Citation:
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Assignee:
株式会社日立製作所
株式会社日立画像情報システム
International Classes:
H03K5/26; G01R25/00; H03L7/095; H03L7/089; (IPC1-7): H03K5/26; H03L7/095
Domestic Patent References:
JP595739A
JP561619A
JP5939928B2
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)