JPS6416121A - Digital pll circuit - Google Patents
Digital pll circuitInfo
- Publication number
- JPS6416121A JPS6416121A JP62173274A JP17327487A JPS6416121A JP S6416121 A JPS6416121 A JP S6416121A JP 62173274 A JP62173274 A JP 62173274A JP 17327487 A JP17327487 A JP 17327487A JP S6416121 A JPS6416121 A JP S6416121A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- ring counter
- circuit
- time
- counter
- 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 simplify the circuit constitution by circulating signal '1' in a ring counter by a clock signal to lead out the output signal from a specific stage of the ring counter. CONSTITUTION:A ring counter 10 consists of FFs 1-5 and gates G1-G11. When an input signal fi is not supplied, the ring counter 10 is operated synchronously with a clock signal CLK and signal '1' is circulated in FFs 1-5. At this time, signal '1' is circulated through Q1, G2-G11, and D1. A lock detecting circuit 20 consists of a gate G14 and a counter 21 : and when the simultaneous occurrence of pulse '1' of an output signal f0 and that of the input signal fi continues for three pulses, the circuit 20 decides phase lock, and a lock detection signal at this time goes to '0'. The signal Q is '1' before this time. Signal '1' is skipped and transmitted or is returned to the preceding stage in accordance with the timing comparison between the position of signal '1' in the ring counter and the signal fi, thereby allowing the phase of the signal f0 to follow up the signal fi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62173274A JPS6416121A (en) | 1987-07-10 | 1987-07-10 | Digital pll circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62173274A JPS6416121A (en) | 1987-07-10 | 1987-07-10 | Digital pll circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6416121A true JPS6416121A (en) | 1989-01-19 |
Family
ID=15957408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62173274A Pending JPS6416121A (en) | 1987-07-10 | 1987-07-10 | Digital pll circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6416121A (en) |
-
1987
- 1987-07-10 JP JP62173274A patent/JPS6416121A/en active Pending
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