JPS57190491A - Variable oscillating circuit - Google Patents

Variable oscillating circuit

Info

Publication number
JPS57190491A
JPS57190491A JP56074725A JP7472581A JPS57190491A JP S57190491 A JPS57190491 A JP S57190491A JP 56074725 A JP56074725 A JP 56074725A JP 7472581 A JP7472581 A JP 7472581A JP S57190491 A JPS57190491 A JP S57190491A
Authority
JP
Japan
Prior art keywords
control voltage
output
case
varied
differential
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.)
Pending
Application number
JP56074725A
Other languages
Japanese (ja)
Inventor
Noriyuki Yamashita
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP56074725A priority Critical patent/JPS57190491A/en
Publication of JPS57190491A publication Critical patent/JPS57190491A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To generate no phase error even if a frequency difference or control voltage is varied, by fixing the control voltage so that a variable oscillator is not controlled, when the frequency difference and the control voltage are varied only a little. CONSTITUTION:To a diferential amplifier 31, the first detecting output VDH and control voltage VCL are supplied, and in case when the control voltage VCL exceeding the detecting output +VS in case of a steady operation has been inputted, the first differential output DU is obtained. On the other hand, to the second differential amplifier 32, the second detecting output VDL and the control voltage VCL are supplied, and in case when the control voltage VCL being lower than the detecting output -VS in case of a steady operation, the second differential output DD is obtained. Accordingly, when a frequency difference is only a little or when control voltage VC is varied only a little, both the differential outputs DU, DD remain ''0'', therefore, a counter 36 is not operated, and an oscillating output of a VCO7 is stabilized.
JP56074725A 1981-05-18 1981-05-18 Variable oscillating circuit Pending JPS57190491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56074725A JPS57190491A (en) 1981-05-18 1981-05-18 Variable oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56074725A JPS57190491A (en) 1981-05-18 1981-05-18 Variable oscillating circuit

Publications (1)

Publication Number Publication Date
JPS57190491A true JPS57190491A (en) 1982-11-24

Family

ID=13555479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56074725A Pending JPS57190491A (en) 1981-05-18 1981-05-18 Variable oscillating circuit

Country Status (1)

Country Link
JP (1) JPS57190491A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61144125A (en) * 1984-12-14 1986-07-01 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Phase lock loop circuit apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61144125A (en) * 1984-12-14 1986-07-01 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Phase lock loop circuit apparatus

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