JPS55141833A - Phase locked loop circuit - Google Patents

Phase locked loop circuit

Info

Publication number
JPS55141833A
JPS55141833A JP5065779A JP5065779A JPS55141833A JP S55141833 A JPS55141833 A JP S55141833A JP 5065779 A JP5065779 A JP 5065779A JP 5065779 A JP5065779 A JP 5065779A JP S55141833 A JPS55141833 A JP S55141833A
Authority
JP
Japan
Prior art keywords
loop
filter
switching
switching unit
phase detector
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
JP5065779A
Other languages
Japanese (ja)
Inventor
Kiyoaki Takahashi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5065779A priority Critical patent/JPS55141833A/en
Publication of JPS55141833A publication Critical patent/JPS55141833A/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
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth

Landscapes

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

Abstract

PURPOSE:To extend the range of pull-in by the switching use of the first and second loop filters where the overall synthesized characteristics are required characteristics, and to enable to perform stable operation at all times by attenuating the noise at switching with the loop filter. CONSTITUTION:The PLL circuit consists of the phase detector 11, the first and second loop filters, 12, 13, switching unit 14 and voltage controlled oscillator (VCO)15. The switching unit 14 can constitute the states; connection of the first loop filter 12 only, and series connection of the first and second loop filters 12 and 13. That is, at the first switching state, the loop of the phase detector 11, switching unit 14, filter 12 and VCO 15 is formed, and at the second switching state, the loop of the phase detector 11, filter 13, switching unit 14, filter 12, and VCO15 is formed.
JP5065779A 1979-04-24 1979-04-24 Phase locked loop circuit Pending JPS55141833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5065779A JPS55141833A (en) 1979-04-24 1979-04-24 Phase locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5065779A JPS55141833A (en) 1979-04-24 1979-04-24 Phase locked loop circuit

Publications (1)

Publication Number Publication Date
JPS55141833A true JPS55141833A (en) 1980-11-06

Family

ID=12865013

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5065779A Pending JPS55141833A (en) 1979-04-24 1979-04-24 Phase locked loop circuit

Country Status (1)

Country Link
JP (1) JPS55141833A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01502232A (en) * 1987-02-13 1989-08-03 ヒユーズ・エアクラフト・カンパニー Improved phase-locked loop
EP0357374A2 (en) * 1988-08-31 1990-03-07 Nec Corporation Phase-locked loop
JPH02143909A (en) * 1988-11-25 1990-06-01 Nikon Corp Magnetic disk device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01502232A (en) * 1987-02-13 1989-08-03 ヒユーズ・エアクラフト・カンパニー Improved phase-locked loop
EP0357374A2 (en) * 1988-08-31 1990-03-07 Nec Corporation Phase-locked loop
JPH02143909A (en) * 1988-11-25 1990-06-01 Nikon Corp Magnetic disk device

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