JPS6351723A - Oscillation circuit - Google Patents
Oscillation circuitInfo
- Publication number
- JPS6351723A JPS6351723A JP61195823A JP19582386A JPS6351723A JP S6351723 A JPS6351723 A JP S6351723A JP 61195823 A JP61195823 A JP 61195823A JP 19582386 A JP19582386 A JP 19582386A JP S6351723 A JPS6351723 A JP S6351723A
- Authority
- JP
- Japan
- Prior art keywords
- alarm
- oscillation
- signal
- frequency
- output
- 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
- 230000010355 oscillation Effects 0.000 title claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 10
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、発振出力周波数が変化し、又は発（辰出力信
号のレベルが低下したときアラームを発生する皿能を備
えた発１辰回路に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides an oscillator circuit having a function of generating an alarm when the oscillation output frequency changes or the level of the oscillation output signal decreases. Regarding.
（従来の技術）
従来、この種の周波数制御発搬器は、その発振出力を逓
降し、逓降した周波数又は、位相を基準となる高精度発
振部の出力と比較し、その誤差出力に応じた制御電圧で
電圧制御発（股部を制御し、前記発（辰出力の発振周波
数を一定に保っていた。(Prior art) Conventionally, this type of frequency control oscillator steps down its oscillation output, compares the stepped down frequency or phase with the output of a high-precision oscillation section as a reference, and calculates the output according to the error output. The oscillation frequency of the oscillation output was kept constant by controlling the voltage controlled oscillation (crotch) using the control voltage.
この時、電圧制御発振部に入力する制御電圧が、成る閾
値を超えた場合は、アラーム信号を送出する機能を有し
ていた。At this time, if the control voltage input to the voltage controlled oscillator exceeds a threshold value, it has a function of sending out an alarm signal.
（発明が解決しようとする問題点）
しかしながら、この様な従来方式では、基準となる高精
度発振部の発振周波数が変化した場合、例えば水晶概動
子が不良で、撮動周波数が変化した場合には、電圧制り
０発振部の出力周波数が変化しているにもかかわらず、
周波数制御ループが正常に働く為、アラーム信号の送出
がなされないという欠点を有していた。(Problem to be Solved by the Invention) However, in this conventional method, if the oscillation frequency of the reference high-precision oscillation unit changes, for example, if the crystal oscillator is defective and the imaging frequency changes, In spite of the fact that the output frequency of the voltage-controlled oscillator is changing,
Since the frequency control loop functions normally, it has the disadvantage that an alarm signal is not sent.
本発明は、上記問題点に鑑みてなされたもので、基準と
なる高精度発振部の発振周波数が変化したことに基づく
出力周波数の変化を確実に検出してアラームを発生する
ことのできる発振回路を提供することを目的とする。The present invention has been made in view of the above problems, and is an oscillation circuit that can reliably detect a change in the output frequency based on a change in the oscillation frequency of a reference high-precision oscillation unit and generate an alarm. The purpose is to provide
（問題点を解決するための手段）
前述の問題点を解決し、上記目的を達成するために本発
明が提供する手段は、周波数ｆ０の発振出力の一部を帰
還信号として抽出し、該帰還信号と基準周波数の信号と
の比較をし、該比較の結果に基づいて前記発振出力の周
波数をｆ。に制御する発振回路であって、前記発振出力
を入力し周波数ｆ。の信号だけを通過させるＰ枝部と、
予め所定の閾値を８９定し該Ｐ枝部の出力値が該閾値を
下回ったときだけアラームの検出をするアラーム検出部
とを設け、発振回路の発振出力を直接監視するようにし
たことを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the above objects, the present invention provides means for extracting a part of the oscillation output of frequency f0 as a feedback signal, and The signal is compared with a signal at a reference frequency, and the frequency of the oscillation output is set to f based on the comparison result. The oscillation circuit controls the frequency f by inputting the oscillation output. a P branch that passes only the signal of
The oscillation output of the oscillation circuit is directly monitored by providing an alarm detection section which sets a predetermined threshold value in advance and detects an alarm only when the output value of the P branch section falls below the threshold value. shall be.
（実施例）
第１図は、本発明の一実施例を示したブロック図である
。１は電圧制御発振部であり、入力電圧即ら、後述する
制御部７の制御電圧に応じて発振周波数をｆ。に制御す
る。２は分岐部であり、電圧制御発振部１の発１辰出力
を所定数に分岐する。(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 denotes a voltage-controlled oscillation unit, which adjusts the oscillation frequency to f according to an input voltage, that is, a control voltage of a control unit 7, which will be described later. to control. Reference numeral 2 denotes a branching section, which branches the oscillator output of the voltage controlled oscillating section 1 into a predetermined number of outputs.
この分岐部２の出力は、逓降部４で逓降され比較部６に
与えられる。比較部６では、基準となる高精度発振部５
の信号と逓降部４の信号とを比較し、比較結果、即ち誤
差信号を制御部７に出力する。The output of this branching section 2 is stepped down by a step down section 4 and given to a comparing section 6. In the comparison section 6, the high-precision oscillation section 5 serves as a reference.
The signal from the step-down section 4 is compared with the signal from the step-down section 4, and the comparison result, that is, an error signal, is output to the control section 7.
制御部７は、誤差信号に基づいて制？！Ｂ電圧を電圧制
御発（駅部１とアラーム検出部８に出力する。アラーム
検出部８には、予め所定の閾値を３２足しており、制御
電圧の値が閾値を下回ったときアラーム検出してアラー
ム信号を端子９を介して出力する。１３は発振制御手段
、３は周波数ｆ。の発（辰出力部である。１０はＰ枝部
であり、第２図に示すように周波数ｆ。の信号だけを通
過させる。The control unit 7 performs control based on the error signal. ! The B voltage is output to the voltage control source (station section 1 and alarm detection section 8).A predetermined threshold value of 32 is added to the alarm detection section 8 in advance, and when the value of the control voltage falls below the threshold value, an alarm is detected. An alarm signal is outputted through the terminal 9. 13 is an oscillation control means, 3 is a frequency f. output part. 10 is a P branch, which outputs a frequency f. as shown in FIG. Only signals are allowed to pass.
１１はアラーム検出部であり、予め所定の閾値を設定し
ており、前記Ｐ枝部１０の出力値が該閾値を下回ったと
きだけアラームを検出し、アラーム信号を端子１２を介
して送出する。ここでアラーム検出部１１は、ｐ技部１
０の出力レベルが単に低下したときのみならず、分岐部
２の出力周波数ｆｏが偏移したことによるレベル低下を
もアラームとして検出することができる。Reference numeral 11 denotes an alarm detection section, which has a predetermined threshold set therein, detects an alarm only when the output value of the P branch section 10 falls below the threshold, and sends out an alarm signal via the terminal 12. Here, the alarm detection unit 11 is
It is possible to detect as an alarm not only a simple drop in the output level of 0, but also a drop in level due to a shift in the output frequency fo of the branching section 2.
尚、アラーム検出部１１に依り検出可能な周波数変化は
、Ｐ技部１０の尖鋭度に限りがある為高精度発振部の周
波数変化に起因する比較的大きな変化のみなので、通常
の周波数変化に対してはアラーム検出部８に依るアラー
ム送出を必要とする。Note that the only frequency changes that can be detected by the alarm detection unit 11 are relatively large changes caused by frequency changes in the high-precision oscillation unit due to the limited sharpness of the P-technical unit 10. Therefore, it is necessary for the alarm detection section 8 to send out an alarm.
第３図は、本発明の他の実施例を示したブロック図であ
る。第３図実施例では、発１辰制御手段１３と分岐部２
とのあいだに逓倍部１４を設け、発（駅制御手段１３の
出力周波数を逓倍部１４で所定の倍率に逓倍し、逓倍し
た周波数ｆ。の信号を分岐部２に与えるようにしたこと
を特徴とする。FIG. 3 is a block diagram showing another embodiment of the invention. In the embodiment shown in FIG.
A multiplier section 14 is provided between the station control means 13, the output frequency of the station control means 13 is multiplied by a predetermined factor, and a signal of the multiplied frequency f is given to the branch section 2. shall be.
（発明の効果）
以上説明したように、本発明は、従来回路にＰ技部１０
、とアラーム検出部１１を付加するだけで簡単な構成に
より基準となる高精度発振部５の誤動作に起因する比較
的大きな周波数変化が生じた時にその旨のアラーム信号
を送出する事が可能となる。(Effects of the Invention) As explained above, the present invention provides a
, and by simply adding the alarm detection section 11, it becomes possible to send an alarm signal to that effect when a relatively large frequency change occurs due to a malfunction of the high-precision oscillation section 5, which serves as a reference, with a simple configuration. .
また、単に出力レベルが低下した場合にもアラーム検出
できるという効果を有する。Moreover, it has the effect that an alarm can be detected even when the output level simply decreases.
第１図は本発明の一実施例を示したブロック図、第２図
は第１図実施例のろ技部１０の減衰特性図、第３図は本
発明の他の実施例を示したブロック図である。
１・・・電圧制御発振部、２・・・分岐部、３・・・発
振出力部、４・・・逓降部、５・・・高精度発振部、６
・・・比較部、７・・・制御部、８，１１・・・アラー
ム検出部、９．１２・・・端子、１０・・・Ｐ枝部、１
３・・・発（駅制御手段。
代理人 弁理士 本 庄 伸 介
１１アラ−，７，矛寅セ卸
第１図
ｆ（４１ｆｌｉ−代
第２図
第３図Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a diagram showing the attenuation characteristics of the filtering section 10 of the embodiment shown in Fig. 1, and Fig. 3 is a block diagram showing another embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Voltage controlled oscillation part, 2... Branch part, 3... Oscillation output part, 4... Step-down part, 5... High-precision oscillation part, 6
... Comparison section, 7... Control section, 8, 11... Alarm detection section, 9.12... Terminal, 10... P branch, 1
3... (Station control means. Agent Patent attorney Shinsuke Honjo
Claims (1)
、該帰還信号と基準周波数の信号との比較をし、該比較
の結果に基づいて前記発振出力の周波数をｆ＿０に制御
する発振回路において、前記発振出力を入力し周波数ｆ
＿０の信号だけを通過させるろ波部と、予め所定の閾値
を設定し該ろ波部の出力値が該閾値を下回った時だけア
ラームの検出をするアラーム検出部とを設けたことを特
徴とする発振回路。An oscillation circuit that extracts a part of the oscillation output of frequency f_0 as a feedback signal, compares the feedback signal with a signal of a reference frequency, and controls the frequency of the oscillation output to f_0 based on the result of the comparison, Input the oscillation output and set the frequency f
It is characterized by being provided with a filtering section that allows only the 0 signal to pass through, and an alarm detection section that sets a predetermined threshold value in advance and detects an alarm only when the output value of the filtering section falls below the threshold value. oscillation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61195823A JPS6351723A (en) | 1986-08-21 | 1986-08-21 | Oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61195823A JPS6351723A (en) | 1986-08-21 | 1986-08-21 | Oscillation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6351723A true JPS6351723A (en) | 1988-03-04 |
Family
ID=16347592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61195823A Pending JPS6351723A (en) | 1986-08-21 | 1986-08-21 | Oscillation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6351723A (en) |
-
1986
- 1986-08-21 JP JP61195823A patent/JPS6351723A/en active Pending
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