JPS5635537A - Reference frequency oscillating method for phase-lock loop - Google Patents
Reference frequency oscillating method for phase-lock loopInfo
- Publication number
- JPS5635537A JPS5635537A JP11025379A JP11025379A JPS5635537A JP S5635537 A JPS5635537 A JP S5635537A JP 11025379 A JP11025379 A JP 11025379A JP 11025379 A JP11025379 A JP 11025379A JP S5635537 A JPS5635537 A JP S5635537A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- counter
- circuit
- reference frequency
- time
- 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
- 239000013078 crystal Substances 0.000 abstract 2
- 238000013329 compounding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To ensure the variation of the reference frequency by an extremely small amount, by divinding the frequency of the crystal oscillator to obtain plural numbers of frequencies and then compounding these frequencies to secure a digital change of reference frequency. CONSTITUTION:The output frequency f1 of the crystal oscillator 21 is divided to 1/2 through the fixed frequency divider 22 to obtain frequency f2. And when the set signal has no agreement with the frequency f2, the switch gate circuit 23 gives a passing to the frequency f2. And this output is counted up by the counter 24. And when the count value coincides with the preset signal, the circuit 23 gives a passing to the f1 via the coincident detecting circuit 25. The fixed frequency divider 27 is connected to the rear stage of the oscillator 21, and thus the signal using the fixed time T as one cycle is delivered. Then the frequency f1 is counted up to the time T. At the time T, both the circuit 25 and the counter 24 are reset, and the counter 24 starts counting of the frequency f2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54110253A JPS6030134B2 (en) | 1979-08-31 | 1979-08-31 | Reference frequency oscillator for phase-locked loops |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54110253A JPS6030134B2 (en) | 1979-08-31 | 1979-08-31 | Reference frequency oscillator for phase-locked loops |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5635537A true JPS5635537A (en) | 1981-04-08 |
| JPS6030134B2 JPS6030134B2 (en) | 1985-07-15 |
Family
ID=14530990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54110253A Expired JPS6030134B2 (en) | 1979-08-31 | 1979-08-31 | Reference frequency oscillator for phase-locked loops |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030134B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6085543U (en) * | 1983-11-17 | 1985-06-12 | 富士ゼロックス株式会社 | Paper feeding device |
| JPH0275539A (en) * | 1988-09-09 | 1990-03-15 | Omron Tateisi Electron Co | Original carrying device |
-
1979
- 1979-08-31 JP JP54110253A patent/JPS6030134B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6030134B2 (en) | 1985-07-15 |
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