JPS6441522A - Phase locked loop circuit - Google Patents

Phase locked loop circuit

Info

Publication number
JPS6441522A
JPS6441522A JP62198460A JP19846087A JPS6441522A JP S6441522 A JPS6441522 A JP S6441522A JP 62198460 A JP62198460 A JP 62198460A JP 19846087 A JP19846087 A JP 19846087A JP S6441522 A JPS6441522 A JP S6441522A
Authority
JP
Japan
Prior art keywords
circuit
voltage
loop
intermittent operation
switch
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
JP62198460A
Other languages
Japanese (ja)
Inventor
Keiichiro Sumikawa
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP62198460A priority Critical patent/JPS6441522A/en
Publication of JPS6441522A publication Critical patent/JPS6441522A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To reduce the lock time et intermittent operation by providing a switching means and a voltage storage means storing an input voltage to a voltage controlled oscillator circuit just before the open circuit between a phase comparator and an LPF. CONSTITUTION:The switching circuit 16 interposed between the phase comparator (PD) 13 and the LPF 9, a charge pump 10 storing an input voltage to the voltage controlled oscillator circuit (VCO) 8 just before the open circuit and a switch control means 18 opening a loop by the switch 16 in the presence of the open circuit command, giving the said storage voltage to the VCO 8 when the open command exists and closing the loop by the switch 16 when the phase difference detected by the PD 13 reaches a prescribed value or below, are provided. When the power of the PLL circuit is switched from OFF to ON in the intermittent operation, the preceding frequency is taken over. Moreover, the loop is closed with a large phase difference and the frequency is not largely deviated. The lock time at the intermittent operation is shortened by the operation.
JP62198460A 1987-08-07 1987-08-07 Phase locked loop circuit Pending JPS6441522A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62198460A JPS6441522A (en) 1987-08-07 1987-08-07 Phase locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62198460A JPS6441522A (en) 1987-08-07 1987-08-07 Phase locked loop circuit

Publications (1)

Publication Number Publication Date
JPS6441522A true JPS6441522A (en) 1989-02-13

Family

ID=16391475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62198460A Pending JPS6441522A (en) 1987-08-07 1987-08-07 Phase locked loop circuit

Country Status (1)

Country Link
JP (1) JPS6441522A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0370431U (en) * 1989-11-13 1991-07-15
US5132794A (en) * 1990-06-13 1992-07-21 Sharp Kabushiki Kaisha Horizontal synchronizing signal separation circuit for a display apparatus
US6781469B2 (en) 2002-09-13 2004-08-24 Mediatek Incorporation Phase-locked loop having phase detector error signal reshaping and method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0370431U (en) * 1989-11-13 1991-07-15
US5132794A (en) * 1990-06-13 1992-07-21 Sharp Kabushiki Kaisha Horizontal synchronizing signal separation circuit for a display apparatus
US6781469B2 (en) 2002-09-13 2004-08-24 Mediatek Incorporation Phase-locked loop having phase detector error signal reshaping and method thereof

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