JPS5899940U - automatic frequency control circuit - Google Patents
automatic frequency control circuitInfo
- Publication number
- JPS5899940U JPS5899940U JP19162281U JP19162281U JPS5899940U JP S5899940 U JPS5899940 U JP S5899940U JP 19162281 U JP19162281 U JP 19162281U JP 19162281 U JP19162281 U JP 19162281U JP S5899940 U JPS5899940 U JP S5899940U
- Authority
- JP
- Japan
- Prior art keywords
- automatic frequency
- control circuit
- frequency control
- voltage
- oscillator
- 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)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のＡＦＣ回路のブロック図、第２図ａ、
ｂは本考案の一実施例のブロック図、第３図は第２図
ａに示すＡＦＣ回路の作用の説明に供するグラフである
。
１・・・・・−ＦＭ検波器、２・・・・・・増幅器、３
・・・・・・局部発振器、４・・・・・・可変容量ダイ
オード、５・・・・・・混合回路、６・・・・・・ロー
パスフィルタ、７・・・・・・トランジスタ、訃・・・
・・単安定マルチバイブレータ。Figure 1 is a block diagram of a conventional AFC circuit, Figure 2a,
3b is a block diagram of an embodiment of the present invention, and FIG. 3 is a graph for explaining the operation of the AFC circuit shown in FIG. 2a. 1...-FM detector, 2...... amplifier, 3
...Local oscillator, 4 ... Variable capacitance diode, 5 ... Mixed circuit, 6 ... Low pass filter, 7 ... Transistor, ...
... Monostable multivibrator.
Claims (1)
る発振器の自動周波数制御回路において、前記自動周波
数制御を開始させる前に発振器の発振周波数のドリフト
の極性によって目的とする制御電圧より低い電圧または
高い電圧を印加した後、前記制御電圧にまで変化させる
ようにしてなることを特徴とする自動周波数制御回路。In an automatic frequency control circuit for an oscillator having a variable capacitance diode for varying the oscillation frequency, before starting the automatic frequency control, a voltage lower or higher than the target control voltage is set depending on the polarity of the drift of the oscillation frequency of the oscillator. An automatic frequency control circuit characterized in that, after being applied, the voltage is changed to the control voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19162281U JPS5899940U (en) | 1981-12-24 | 1981-12-24 | automatic frequency control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19162281U JPS5899940U (en) | 1981-12-24 | 1981-12-24 | automatic frequency control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5899940U true JPS5899940U (en) | 1983-07-07 |
Family
ID=30105072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19162281U Pending JPS5899940U (en) | 1981-12-24 | 1981-12-24 | automatic frequency control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5899940U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5417653A (en) * | 1977-07-11 | 1979-02-09 | Victor Co Of Japan Ltd | Automatic high-frequency control circuit |
-
1981
- 1981-12-24 JP JP19162281U patent/JPS5899940U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5417653A (en) * | 1977-07-11 | 1979-02-09 | Victor Co Of Japan Ltd | Automatic high-frequency control circuit |
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