JPH0526807Y2 - - Google Patents
Info
- Publication number
- JPH0526807Y2 JPH0526807Y2 JP7808489U JP7808489U JPH0526807Y2 JP H0526807 Y2 JPH0526807 Y2 JP H0526807Y2 JP 7808489 U JP7808489 U JP 7808489U JP 7808489 U JP7808489 U JP 7808489U JP H0526807 Y2 JPH0526807 Y2 JP H0526807Y2
- Authority
- JP
- Japan
- Prior art keywords
- diode
- voltage
- variable capacitance
- circuit
- modulation
- 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.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 3
- 239000013078 crystal Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
【考案の詳細な説明】
〈本考案の目的〉
［産業上の利用分野］
本考案は、圧電発振器に変調をかけ、起動時の
受信側におけるデータ等の頭切れを防止した圧電
発振回路に関する。[Detailed Description of the Invention] <Purpose of the Invention> [Industrial Field of Application] The present invention relates to a piezoelectric oscillator circuit that applies modulation to a piezoelectric oscillator to prevent the beginning of data, etc., from being cut off on the receiving side at startup.
［従来の技術］
従来より水晶発振器に音声やデータ信号の変調
をかける直接変調回路が使用されている。第３図
は、従来の変調回路であるが、定電圧電源から可
変抵抗で調整された直流電圧は水晶振動子に直列
に接続された可変容量ダイオードにかけられる。
この電圧は、水晶振動子の周波数調整、すなわち
零調のためにある。[Prior Art] Conventionally, direct modulation circuits have been used that modulate audio and data signals on crystal oscillators. FIG. 3 shows a conventional modulation circuit, in which a DC voltage adjusted by a variable resistor from a constant voltage power source is applied to a variable capacitance diode connected in series to a crystal resonator.
This voltage is for frequency adjustment of the crystal resonator, that is, for zero adjustment.
一方、低周波の音声やデータ信号は可変抵抗
R1を通して可変容量ダイオードに供給され、周
波数が偏移して周波数変調がかかる。しかしこの
様な回路で変調をかけると、発振器の起動時に受
信側で変調信号に頭切れが生じる。これは零調の
電圧が規定電圧にあるのに遅れが生じる結果、受
信側でデータに頭切れを生じるおそれがあつた。
第２図は、従来の回路における零調の電圧が可変
容量ダイオードにかかる時間を示すグラフで、規
定の電圧V1に達するまでの時間は従来回路では
曲線Ａのように立ち上がりが遅い。本回路例では
規定の電圧に達するまでに約780msecかかつてい
た。 On the other hand, low frequency voice and data signals are handled by a variable resistor.
It is supplied to the variable capacitance diode through R1 , and the frequency is shifted and frequency modulated. However, when modulation is applied using such a circuit, the beginning of the modulated signal will be cut off on the receiving side when the oscillator is started. This is because there is a delay even though the voltage of the zero adjustment is at the specified voltage, and as a result, there is a risk that the beginning of the data may be cut off on the receiving side.
FIG. 2 is a graph showing the time it takes for a zero-adjustment voltage to reach a variable capacitance diode in a conventional circuit.The rise of the time required for the voltage to reach the specified voltage V1 is slow in the conventional circuit, as shown by curve A. In this circuit example, it took about 780 msec to reach the specified voltage.
［考案が解決しようとする課題］
従来の回路では起動時の変調の立ち上がりが遅
いため、受信側でデータ等の頭切れ現象が生じる
ので、なんとか立ち上がりを早くする必要があ
る。[Problem to be solved by the invention] In the conventional circuit, the rise of modulation at startup is slow, which causes a phenomenon in which the beginning of data etc. is cut off on the receiving side, so it is necessary to somehow speed up the rise.
［本考案の目的］
本考案の目的は、圧電発振回路の直接変調回路
における零調用電圧の立ち上がり時間を早くし
て、データの頭切れのない発振器を提供すること
にある。[Objective of the Present Invention] An object of the present invention is to provide an oscillator with no truncated data by increasing the rise time of the zero adjustment voltage in the direct modulation circuit of the piezoelectric oscillation circuit.
〈本考案の構成〉
［課題を解決する手段］
立ち上がりが遅い原因としては、変調信号を伝
えるカツプリングコンデンサＣに充電される時間
がかかるためである。カツプリングコンデンサ
は、低周波信号であるため、数μF〜数十μFの容
量の大きなコンデンサが使われている。そこでこ
のカツプリングコンデンサに早く充電させれば頭
切れは解決される。<Configuration of the Present Invention> [Means for Solving the Problems] The slow rise is due to the fact that it takes time for the coupling capacitor C that transmits the modulation signal to be charged. Since the coupling capacitor is a low frequency signal, a capacitor with a large capacitance of several μF to several tens of μF is used. Therefore, if this coupling capacitor is charged quickly, the problem of head-off can be solved.
［作用］
本考案では、コンデンサＣに早く充電させるた
め、直流を供給する抵抗にダイオードを並列に接
続し、回路の時定数を小さくしてコンデンサＣへ
の充電時間を早くしている。[Function] In the present invention, in order to charge the capacitor C quickly, a diode is connected in parallel to a resistor that supplies direct current, and the time constant of the circuit is made small to shorten the charging time to the capacitor C.
［実施例］
第１図は、本考案の実施例を示す回路図であ
る。発振器には水晶振動子Ｘが接続され、水晶振
動子に直列に可変容量ダイオードVDが接続され
ている。変調信号Vmは通常低周波であり、可変
抵抗R2により調整されカツプリングコンデンサ
Ｃを介して可変容量ダイオードVDに接続され
る。一方周波数調整用電圧Vcは可変抵抗R1を経
て抵抗Ｒを通して可変容量ダイオードVDに加わ
るが、抵抗Ｒには並列にダイオードＤを接続す
る。ダイオードＤは、シヨツトキーバリヤダイオ
ード等の高速のダイオードが良いが、普通の小信
号用ダイオードであつてもよい。[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of the present invention. A crystal resonator X is connected to the oscillator, and a variable capacitance diode VD is connected in series with the crystal resonator. The modulation signal Vm is usually of low frequency and is adjusted by a variable resistor R2 and connected via a coupling capacitor C to a variable capacitance diode VD. On the other hand, the frequency adjustment voltage Vc is applied to the variable capacitance diode VD through the variable resistor R1 and the resistor R, but a diode D is connected in parallel to the resistor R. The diode D is preferably a high-speed diode such as a shot key barrier diode, but may also be an ordinary small signal diode.
本考案によつてダイオードＤを接続すると第２
図の曲線Ｂのように従来に比べ立ち上がり時間を
早くすることが出来た。本考案での立ち上がり時
間t1は、シヨツトキーバリヤダイオードを用いた
時に約18msecとなり、従来に比べ約40倍早くな
つた。 When diode D is connected according to the present invention, the second
As shown by curve B in the figure, the rise time can be made faster than before. The rise time t1 in the present invention is approximately 18 msec when a Schottky barrier diode is used, which is approximately 40 times faster than the conventional method.
〈本考案の効果〉
本考案では圧電発振器回路に変調し、発振器の
起動時に生じる零調整電圧の立ち上がりが遅いた
め、受信側で変調の頭切れが生じていたが、本考
案によつて周波数の零調用電圧の応答が早くな
り、受信側での変調の頭切れがなくなり、信頼性
の高い発振器回路となつた。<Effects of the present invention> In the present invention, modulation is applied to the piezoelectric oscillator circuit, and the rise of the zero adjustment voltage that occurs when the oscillator is started is slow, resulting in the beginning of modulation being cut off on the receiving side. The zero-adjustment voltage response is faster, there is no longer a modulation cut-off on the receiving side, and the oscillator circuit is highly reliable.
第１図は本考案の実施例を示す回路図、第２図
は本考案と従来の回路の立ち上がり時間を示すグ
ラフ、第３図は従来の回路図である。
Ｘ……圧電振動子、VD……可変容量ダイオー
ド、Ｄ……ダイオード、Ｒ……抵抗。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a graph showing rise times of the present invention and a conventional circuit, and FIG. 3 is a conventional circuit diagram. X...piezoelectric vibrator, VD...variable capacitance diode, D...diode, R...resistance.
Claims (1)
可変容量ダイオードに変調信号を加えて周波数変
調させる圧電発振回路において、コンデンサを介
して該変調信号を入力し、該変調信号に直流電圧
を重畳させるため、該コンデンサと接続され、該
可変容量ダイオードに直流電圧を供給する抵抗と
並列にダイオードを接続したことを特徴とする圧
電発振回路。 In a piezoelectric oscillation circuit that connects a variable capacitance diode to a piezoelectric vibrator and modulates the frequency by applying a modulation signal to the variable capacitance diode, the modulation signal is input through a capacitor and a DC voltage is superimposed on the modulation signal. , a piezoelectric oscillation circuit characterized in that a diode is connected in parallel with a resistor that is connected to the capacitor and supplies a DC voltage to the variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7808489U JPH0526807Y2 (en) | 1989-06-30 | 1989-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7808489U JPH0526807Y2 (en) | 1989-06-30 | 1989-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0316718U JPH0316718U (en) | 1991-02-19 |
| JPH0526807Y2 true JPH0526807Y2 (en) | 1993-07-07 |
Family
ID=31621049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7808489U Expired - Lifetime JPH0526807Y2 (en) | 1989-06-30 | 1989-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0526807Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220938A (en) * | 2015-10-26 | 2016-01-06 | 湖州中恒园林建设有限公司 | A kind of gardens guardrail |
-
1989
- 1989-06-30 JP JP7808489U patent/JPH0526807Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0316718U (en) | 1991-02-19 |
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