JPS5752270A - Phase detecting circuit - Google Patents

Phase detecting circuit

Info

Publication number
JPS5752270A
JPS5752270A JP12604480A JP12604480A JPS5752270A JP S5752270 A JPS5752270 A JP S5752270A JP 12604480 A JP12604480 A JP 12604480A JP 12604480 A JP12604480 A JP 12604480A JP S5752270 A JPS5752270 A JP S5752270A
Authority
JP
Japan
Prior art keywords
trs
circuit
current
drop
constant
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
JP12604480A
Other languages
Japanese (ja)
Other versions
JPS6046592B2 (en
Inventor
Shigeyoshi Kimura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12604480A priority Critical patent/JPS6046592B2/en
Publication of JPS5752270A publication Critical patent/JPS5752270A/en
Publication of JPS6046592B2 publication Critical patent/JPS6046592B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To offset characteristics of control sensitivity and detection sensitivity in a low voltage working area, and to prevent a drop of a DC loop gain, by decreasing a current of a constant-current circuit as a logarithmic function, against the oscillation frequency control sensitivity which is increased as a hyperbolic function by voltage reduction. CONSTITUTION:A differential pair of transistors TRs 6,7 constituting a switching circuit are provided on a phase detecting circuit of an AFC circuit of a TV set, the same bias is supplied to the base of each TRs 6, 7 through resistances 13, 14, and a comparison voltage input terminal B is connected to the base of the TR 7. Also, loads by TRs 8, 9 are connected to the collectors of the TRs 6, 7, an output terminal C is connected to the collector of the TR7, and a constant-current circuit 26 is connected in common to the emitters of the TRs 6, 7. Furthermore, a TR23 of diode-connection is connected to a TR10 of the circuit 26, and when there is an input to a reference signal input terminal A, a current is inputted to the TRs 6, 7. When this current is decreased as a logarithmic function against supply voltage Vcc, a drop of a DC loop gain is prevented.
JP12604480A 1980-09-12 1980-09-12 Phase detection circuit Expired JPS6046592B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12604480A JPS6046592B2 (en) 1980-09-12 1980-09-12 Phase detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12604480A JPS6046592B2 (en) 1980-09-12 1980-09-12 Phase detection circuit

Publications (2)

Publication Number Publication Date
JPS5752270A true JPS5752270A (en) 1982-03-27
JPS6046592B2 JPS6046592B2 (en) 1985-10-16

Family

ID=14925261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12604480A Expired JPS6046592B2 (en) 1980-09-12 1980-09-12 Phase detection circuit

Country Status (1)

Country Link
JP (1) JPS6046592B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63292372A (en) * 1987-05-26 1988-11-29 Nec Corp Graphic display system

Also Published As

Publication number Publication date
JPS6046592B2 (en) 1985-10-16

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