JPS55117338A - Phase synchronous circuit - Google Patents

Phase synchronous circuit

Info

Publication number
JPS55117338A
JPS55117338A JP2472879A JP2472879A JPS55117338A JP S55117338 A JPS55117338 A JP S55117338A JP 2472879 A JP2472879 A JP 2472879A JP 2472879 A JP2472879 A JP 2472879A JP S55117338 A JPS55117338 A JP S55117338A
Authority
JP
Japan
Prior art keywords
attenuator
detector
phase synchronous
level
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2472879A
Other languages
Japanese (ja)
Other versions
JPS6247374B2 (en
Inventor
Shunichiro Tejima
Akira Fujii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2472879A priority Critical patent/JPS55117338A/en
Publication of JPS55117338A publication Critical patent/JPS55117338A/en
Publication of JPS6247374B2 publication Critical patent/JPS6247374B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To eliminate the phase shift which occurs the signal level of the phase synchronous circuit has a sudden increase by giving the control to the variable attenuator when the detection voltage of the second detector exceeds the prescribed level and thus lowering the input signal level of the phase synchronous loop. CONSTITUTION:The attenuation quantity of variable attenuator 7 is controlled by the output the orthogonal detector which forms the phase synchronous loop. Thus the attenuation quantity of attenuator 7 is varied to secure the constant and automatic amplitude control at all time for input signal 4. Then diode 14 is connected to the output of the second detector 12 of the phase synchronous loop via amplifier 13. And no operation is given to amplifier 13 and diode 14 which form the second phase synchronization to give the control to attenuator 7 in case the output of detector 12 is less than the prescribed level. Then attenuator 7 is controlled by the voltage of diode 14 when the output of detector 12 exceeds the prescribed level. Thus the level is lowered for input signal 4 of the phase synchronous loop, and as a result, no phase shift is caused although the preceding signal level of attenuator 7 may vary.
JP2472879A 1979-03-02 1979-03-02 Phase synchronous circuit Granted JPS55117338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2472879A JPS55117338A (en) 1979-03-02 1979-03-02 Phase synchronous circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2472879A JPS55117338A (en) 1979-03-02 1979-03-02 Phase synchronous circuit

Publications (2)

Publication Number Publication Date
JPS55117338A true JPS55117338A (en) 1980-09-09
JPS6247374B2 JPS6247374B2 (en) 1987-10-07

Family

ID=12146206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2472879A Granted JPS55117338A (en) 1979-03-02 1979-03-02 Phase synchronous circuit

Country Status (1)

Country Link
JP (1) JPS55117338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723037A (en) * 1993-06-23 1995-01-24 Nec Corp Clock synchronizing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0723037A (en) * 1993-06-23 1995-01-24 Nec Corp Clock synchronizing circuit

Also Published As

Publication number Publication date
JPS6247374B2 (en) 1987-10-07

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