Title:
PHASE COMPARATOR
Document Type and Number:
Japanese Patent JPH1155123
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To constitute an analog phase comparator, without the use of a differential circuit and a full rectifier circuit, even in an optical transmission system which uses non-return to zero(NRZ) data signals. SOLUTION: A data input terminal and a clock input terminal are connected to a phase comparator circuit PD1, a data input terminal is connected to a phase comparator circuit PD2 and connected from the clock input terminal via a 90 deg. phase shifter to the clock input terminal of the phase comparator circuit PD2: and Furthermore, the output terminals of the phase comparator circuits PD1 and PD2 are connected to the input of an exclusive OR circuit. Due to a data signal converting circuit having such a style, the NRZ signal to be used for the optical transmission system can be converted into a return-to zero(RZ) signal which can be compared with a clock signal.
Inventors:
ISHIKAWA KYOSUKE
Application Number:
JP21288497A
Publication Date:
February 26, 1999
Filing Date:
August 07, 1997
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H03K5/26; H03D13/00; H03L7/089; H03M5/06; H04L25/49; (IPC1-7): H03M5/06; H03D13/00; H03K5/26; H03L7/089; H04L25/49
Attorney, Agent or Firm:
Ogawa Katsuo
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