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JPS57160226A - Pll circuit having plural voltage-controlled oscillators - Google Patents

Pll circuit having plural voltage-controlled oscillators

Info

Publication number
JPS57160226A
JPS57160226A JP56045608A JP4560881A JPS57160226A JP S57160226 A JPS57160226 A JP S57160226A JP 56045608 A JP56045608 A JP 56045608A JP 4560881 A JP4560881 A JP 4560881A JP S57160226 A JPS57160226 A JP S57160226A
Authority
JP
Japan
Prior art keywords
voltage
output
controlled oscillators
oscillators
circuit
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
JP56045608A
Other languages
Japanese (ja)
Inventor
Akihiko Ito
Hisami Tanaka
Kazuhiro Kobayashi
Toshihiko Matsumura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56045608A priority Critical patent/JPS57160226A/en
Publication of JPS57160226A publication Critical patent/JPS57160226A/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 obtain plural output signals having oscillation frequencies or duty cycles by providing a PLL circuit with voltage-controlled oscillators which differ in time constant, and allowing one of those oscillators to drive the other voltage- controlled oscillators by its output control voltage. CONSTITUTION:A PLL circuit consists of a phase comparator 1 receiving an input signal, a loop filter 2, and voltage-controlled oscillators 3-i (i=1-n) driven by its output control voltage V. The output of the oscillator 3-1 is phase-compared with the input signal by the comparator 1. When the output of Schmitt trigger circuit 6i of the oscillator 3-i is at a level H, a switch SW7i is closed to charge a capacitor Ci with a current from a contant current source 4i, thus raising a voltage at a point Ai. When the voltage at the point Ai reaches a high threshold value, the output of the circuit 6i is inverted to a level L and while the SW7i is opened, a SW8i is closed to discharge the Ci through a constant current source 5i; when the voltage at the point Ai reaches a low threshold value, the output of the circuit 6i is inverted again to a level H, and this operation is repeated to perform oscillation. The oscillation time constants of respective oscillators are made different to output signals having different frequencies.
JP56045608A 1981-03-30 1981-03-30 Pll circuit having plural voltage-controlled oscillators Pending JPS57160226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045608A JPS57160226A (en) 1981-03-30 1981-03-30 Pll circuit having plural voltage-controlled oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045608A JPS57160226A (en) 1981-03-30 1981-03-30 Pll circuit having plural voltage-controlled oscillators

Publications (1)

Publication Number Publication Date
JPS57160226A true JPS57160226A (en) 1982-10-02

Family

ID=12724073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045608A Pending JPS57160226A (en) 1981-03-30 1981-03-30 Pll circuit having plural voltage-controlled oscillators

Country Status (1)

Country Link
JP (1) JPS57160226A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59117828A (en) * 1982-12-14 1984-07-07 エスジ−エス−エ−テ−イ−エス・ドイチランド・ハルブライタ−−バウエレメンテ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Pll circuit
JPS6184115A (en) * 1984-09-29 1986-04-28 Toshiba Corp Voltage controlled oscillator
WO2018022171A1 (en) * 2016-07-25 2018-02-01 Sandisk Technologies Llc Multiple-output oscillator circuits

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59117828A (en) * 1982-12-14 1984-07-07 エスジ−エス−エ−テ−イ−エス・ドイチランド・ハルブライタ−−バウエレメンテ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Pll circuit
JPS6184115A (en) * 1984-09-29 1986-04-28 Toshiba Corp Voltage controlled oscillator
WO2018022171A1 (en) * 2016-07-25 2018-02-01 Sandisk Technologies Llc Multiple-output oscillator circuits

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