JPS6442948A - Clock phase locked loop circuit - Google Patents
Clock phase locked loop circuitInfo
- Publication number
- JPS6442948A JPS6442948A JP62199450A JP19945087A JPS6442948A JP S6442948 A JPS6442948 A JP S6442948A JP 62199450 A JP62199450 A JP 62199450A JP 19945087 A JP19945087 A JP 19945087A JP S6442948 A JPS6442948 A JP S6442948A
- Authority
- JP
- Japan
- Prior art keywords
- clock
- phase
- clocks
- coincident
- frequency difference
- 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
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
PURPOSE:To improve the tracking characteristic of input data with respect to a clock by counting the clock number between coincident points of leading of both the clocks, detecting the frequency difference information of both the clocks, increasing/decreasing the number of master clocks and making the phase of the clock of the input data coincident with the phase of the output clock. CONSTITUTION:A frequency difference detection means 1, an adjusting pulse generating means 2, a phase adjusting device 3, and a frequency divider 4 form a digital phase locked loop D-PLL and the D-PL applies loop control till the information T representing the frequency difference between the clocks CK1, CK2 represents zero. Thus, even when the input clock CK1 has any phase error, the period of the output clock CK2 is coincident with the period of the input clock CK1 for each prescribed time and the synchronization is established. Thus, the clock phase synchronizing circuit with excellent tracking is obtained by simple circuit constitution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62199450A JPS6442948A (en) | 1987-08-10 | 1987-08-10 | Clock phase locked loop circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62199450A JPS6442948A (en) | 1987-08-10 | 1987-08-10 | Clock phase locked loop circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6442948A true JPS6442948A (en) | 1989-02-15 |
Family
ID=16408016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62199450A Pending JPS6442948A (en) | 1987-08-10 | 1987-08-10 | Clock phase locked loop circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6442948A (en) |
-
1987
- 1987-08-10 JP JP62199450A patent/JPS6442948A/en active Pending
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