JPS5486256A - Frequency control circuit - Google Patents
Frequency control circuitInfo
- Publication number
- JPS5486256A JPS5486256A JP15410777A JP15410777A JPS5486256A JP S5486256 A JPS5486256 A JP S5486256A JP 15410777 A JP15410777 A JP 15410777A JP 15410777 A JP15410777 A JP 15410777A JP S5486256 A JPS5486256 A JP S5486256A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- assigned
- memory
- oscillator
- time interval
- 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
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
Abstract
PURPOSE:To obtain a stable frequency control circuit which suits to frequency control at the time of electronic tuning by making the output of a voltage or current control oscillator agree with a frequency set to an assignment frequency memory. CONSTITUTION:The value of the assigned oscillation frequency is set to assignment frequency memory 16 by a digital signal first. Frequency counter 12, on the other hand, counts the oscillation frequency of voltage control oscillator 11. The contents of counter 12 are compared with those of memory 16 by frequency-value comparator 15. In this case, the comparison is done at a certain time interval and the time interval is assigned by clock pulse generator 17. The comparison result of frequency values is supplied to frequency control signal generator 14 to generate a digital signal for adjustment of the frequency and oscillator 11 is controlled via digital converter 13 to adjust the oscillation frequency. When the oscillation frequency of oscillator 11 agrees with that assigned by memory 16, the output of signal generator 14 becomes constant and then, a slight shift in frequency caused by the drift of the system is supervised and corrected at the time interval assigned by pulse generator 17.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15410777A JPS5486256A (en) | 1977-12-21 | 1977-12-21 | Frequency control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15410777A JPS5486256A (en) | 1977-12-21 | 1977-12-21 | Frequency control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5486256A true JPS5486256A (en) | 1979-07-09 |
Family
ID=15577066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15410777A Pending JPS5486256A (en) | 1977-12-21 | 1977-12-21 | Frequency control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5486256A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59167722A (en) * | 1983-03-14 | 1984-09-21 | Kokusai Kikai Shindo Kenkyusho:Kk | Automatic oscillation controller |
JPS6027233A (en) * | 1983-07-22 | 1985-02-12 | Matsushita Electric Ind Co Ltd | Phase synchronization circuit |
JPS61174823A (en) * | 1985-01-30 | 1986-08-06 | Yaesu Musen Co Ltd | Fine adjusting circuit of oscillation frequency |
JPS62294331A (en) * | 1985-12-03 | 1987-12-21 | Radio Res Lab | High speed frequency switching synthesizer |
EP1184961A1 (en) * | 2000-08-21 | 2002-03-06 | Motorola, Inc. | Apparatus and method for reducing noise in a switch mode power management system |
-
1977
- 1977-12-21 JP JP15410777A patent/JPS5486256A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59167722A (en) * | 1983-03-14 | 1984-09-21 | Kokusai Kikai Shindo Kenkyusho:Kk | Automatic oscillation controller |
JPS6027233A (en) * | 1983-07-22 | 1985-02-12 | Matsushita Electric Ind Co Ltd | Phase synchronization circuit |
JPH0563969B2 (en) * | 1983-07-22 | 1993-09-13 | Matsushita Electric Ind Co Ltd | |
JPS61174823A (en) * | 1985-01-30 | 1986-08-06 | Yaesu Musen Co Ltd | Fine adjusting circuit of oscillation frequency |
JPS62294331A (en) * | 1985-12-03 | 1987-12-21 | Radio Res Lab | High speed frequency switching synthesizer |
EP1184961A1 (en) * | 2000-08-21 | 2002-03-06 | Motorola, Inc. | Apparatus and method for reducing noise in a switch mode power management system |
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