JPS6441522A - Phase locked loop circuit - Google Patents
Phase locked loop circuitInfo
- 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
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.
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)
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 |
-
1987
- 1987-08-07 JP JP62198460A patent/JPS6441522A/en active Pending
Cited By (3)
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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