JPS6413813A - Phase locked loop circuit with drift detection function - Google Patents
Phase locked loop circuit with drift detection functionInfo
- Publication number
- JPS6413813A JPS6413813A JP62168687A JP16868787A JPS6413813A JP S6413813 A JPS6413813 A JP S6413813A JP 62168687 A JP62168687 A JP 62168687A JP 16868787 A JP16868787 A JP 16868787A JP S6413813 A JPS6413813 A JP S6413813A
- Authority
- JP
- Japan
- Prior art keywords
- drift
- phase
- window
- output
- clock
- 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.)
- Granted
Links
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To highly accurately and stably detect a drift by storing a window waveform in a memory for phase comparison frequency generation and comparing the window waveform with a phase of the input so as to discriminate coincidence/discrepancy. CONSTITUTION:In a frequency synthesizer provided with a drift detection circuit, a ROM 25 is controlled by address information generated by a frequency divider 24 from an output of a voltage controlled oscillator (VCO) 23 and a phase difference between an input clock IN and a phase comparison clock CLK outputted from the ROM 25 is detected by a phase comparator 21. Then an output signal of the phase comparator 21 through an LPF 22 is used for a control voltage of the VCO 23 to obtain an output clock OUT. Through the constitution above, if a drift takes place, the input clock IN and the window are overlapped. If the leading edge of the input clock IN and the window are overlapped, a Q output ALM of the FF 26 goes to '1' to detect the drift.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62168687A JPH0693629B2 (en) | 1987-07-08 | 1987-07-08 | Phase locked loop circuit with drift detection function |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62168687A JPH0693629B2 (en) | 1987-07-08 | 1987-07-08 | Phase locked loop circuit with drift detection function |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6413813A true JPS6413813A (en) | 1989-01-18 |
JPH0693629B2 JPH0693629B2 (en) | 1994-11-16 |
Family
ID=15872606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62168687A Expired - Lifetime JPH0693629B2 (en) | 1987-07-08 | 1987-07-08 | Phase locked loop circuit with drift detection function |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0693629B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02209015A (en) * | 1989-02-09 | 1990-08-20 | Nec Corp | Self-running detection circuit for pll |
JPH0318122A (en) * | 1989-06-14 | 1991-01-25 | Fujitsu Ltd | Phase difference detecting circuit |
JP2007235577A (en) * | 2006-03-01 | 2007-09-13 | Toshiba Corp | Phase locked loop circuit and method of controlling same |
-
1987
- 1987-07-08 JP JP62168687A patent/JPH0693629B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02209015A (en) * | 1989-02-09 | 1990-08-20 | Nec Corp | Self-running detection circuit for pll |
JPH0318122A (en) * | 1989-06-14 | 1991-01-25 | Fujitsu Ltd | Phase difference detecting circuit |
JP2007235577A (en) * | 2006-03-01 | 2007-09-13 | Toshiba Corp | Phase locked loop circuit and method of controlling same |
Also Published As
Publication number | Publication date |
---|---|
JPH0693629B2 (en) | 1994-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES2120877A1 (en) | Phase lock loop synchronization circuit and method | |
CA2010265A1 (en) | Phase-locked loop apparatus | |
KR890009067A (en) | Frequency Synthesizer with Digital Phase Detector | |
KR900001819B1 (en) | Pll frequwncy synthesizer | |
EP0600680B1 (en) | Harmonic lock detector | |
KR910008969A (en) | Slip Phase Control Phase Synchronous Loop | |
JPS6413813A (en) | Phase locked loop circuit with drift detection function | |
GB1485685A (en) | Frequency locking system | |
US6249560B1 (en) | PLL circuit and noise reduction means for PLL circuit | |
JPS5953732B2 (en) | Out-of-sync detection circuit | |
DE3776217D1 (en) | DEMODULATOR ARRANGEMENT. | |
EP0206247A3 (en) | Pll frequency synthesizer | |
ATE75084T1 (en) | OSCILLATOR DEVICE FOR GENERATION OF AT LEAST TWO DIFFERENT FREQUENCIES. | |
JPS5252616A (en) | Synchronous signal generating circuit in data reading device | |
JP2972294B2 (en) | Phase locked loop | |
JPS60247330A (en) | Unlock detecting circuit | |
JPS5621404A (en) | Am synchronous detecting circuit | |
KR950001436B1 (en) | Reference pulse generated circuit | |
JPS61296822A (en) | Lead phase detector | |
JPS63124623A (en) | Unlock detection circuit for pll frequency synthesizer | |
JPS63200641A (en) | Clock generating circuit for extracting digital data | |
SU964984A1 (en) | Digital frequency synthesizer | |
JPS6461120A (en) | Phase synchronizing oscillator | |
KR890001294A (en) | Digital PLL State Detection Circuit | |
JPS5776929A (en) | Pll synchronizing detector |