JPS6436122A - Phase locked loop circuit - Google Patents
Phase locked loop circuitInfo
- Publication number
- JPS6436122A JPS6436122A JP62191958A JP19195887A JPS6436122A JP S6436122 A JPS6436122 A JP S6436122A JP 62191958 A JP62191958 A JP 62191958A JP 19195887 A JP19195887 A JP 19195887A JP S6436122 A JPS6436122 A JP S6436122A
- Authority
- JP
- Japan
- Prior art keywords
- synchronism
- state
- threshold value
- sequential
- locked loop
- 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)
Abstract
PURPOSE:To restore the state to the synchronizing state quickly even when out of synchronism is caused by discriminating out of synchronism so as to change a threshold value of a sequential filter. CONSTITUTION:A sequential counter 8 counts lead/lag control signals 4a, 4b from a sequential filter 4 and judges it to be in the state of out of synchronism when a prescribed number of each of the lead/lag control signals 4a,4b is counted consecutively to give an out of synchronism output. When the state of out of synchronism is detected, a threshold value of a threshold value setting means 9 is revised thereby decreasing the threshold value of the sequential filter 4 in the state of out of synchronism more than that in the synchronizing state. Thus, the frequency of phase adjustment is increased and the out of synchronism is cancelled quickly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191958A JPS6436122A (en) | 1987-07-30 | 1987-07-30 | Phase locked loop circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191958A JPS6436122A (en) | 1987-07-30 | 1987-07-30 | Phase locked loop circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6436122A true JPS6436122A (en) | 1989-02-07 |
Family
ID=16283275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62191958A Pending JPS6436122A (en) | 1987-07-30 | 1987-07-30 | Phase locked loop circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6436122A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0463021A (en) * | 1990-06-30 | 1992-02-28 | Nec Corp | Pll frequency synthesizer |
JPH05145414A (en) * | 1991-11-21 | 1993-06-11 | Matsushita Electric Ind Co Ltd | Automatic frequency controller |
-
1987
- 1987-07-30 JP JP62191958A patent/JPS6436122A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0463021A (en) * | 1990-06-30 | 1992-02-28 | Nec Corp | Pll frequency synthesizer |
JPH05145414A (en) * | 1991-11-21 | 1993-06-11 | Matsushita Electric Ind Co Ltd | Automatic frequency controller |
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