JPS5877315A - Electronic tuning circuit - Google Patents
Electronic tuning circuitInfo
- Publication number
- JPS5877315A JPS5877315A JP17449681A JP17449681A JPS5877315A JP S5877315 A JPS5877315 A JP S5877315A JP 17449681 A JP17449681 A JP 17449681A JP 17449681 A JP17449681 A JP 17449681A JP S5877315 A JPS5877315 A JP S5877315A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- coil
- voltage
- control voltage
- tuning circuit
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
- H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
- H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
Abstract
Description
【発明の詳細な説明】
本発明は可変容量ダイオードとコイルとからなシ可変容
量ダイオードに印加する電圧を可変し同調させる電子同
調回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic tuning circuit that includes a variable capacitance diode and a coil and that varies and tunes the voltage applied to the variable capacitance diode.
従来の電子同一回路は第１図−）、−）および−）に示
す如く構成されて−た。第１図−）に示す電子同調回路
は；ンデンナ１と可変容量ダイオード２との直列回路に
、コイル３を並列に接続し、コンダンｔ１の一端をアー
スして構成し、コイル３の一端をアースするとともにコ
ンデンサ１と可変容量ダイオード２との共ＭＷ続点に抵
抗４またはコイルＳを通して直流制御電圧を印加するよ
うに構成してｉる。を九、第１図伽）に示す如くコイル
３０他端をアースしたものもある。また第１図に）に示
す如く第１図−）または伽）のコンデンサ１に代って可
変容量ダイオード６を用いたものもある。Conventional electronic identical circuits have been constructed as shown in FIGS. The electronic tuning circuit shown in FIG. At the same time, a DC control voltage is applied to the common MW connection point of the capacitor 1 and the variable capacitance diode 2 through a resistor 4 or a coil S. There is also one in which the other end of the coil 30 is grounded, as shown in Figure 1. Furthermore, as shown in FIG. 1), there is also a device in which a variable capacitance diode 6 is used in place of the capacitor 1 in FIG.
しかるにこれら従来の電子量ｗ４回路におｉて、抵４４
１九はコイル５を通して直流制御電圧を変化させて可変
容量ダイオードの容量を変化させて、共振周波数を変化
させている。しかるに直流制御電圧が印加される点のイ
ンピーダンスは高い九めに、直流制御電圧に不要な交流
電圧が重畳され易く、交流電圧が可変容量ダイオードの
両端に印加されると、可変容量ダイオードの容量変化に
よシ共振周波数が１Ｍ変調され、８４を悪化させる欠点
があった。However, in these conventional electron quantity w4 circuits, the resistance 44
19 changes the DC control voltage through the coil 5 to change the capacitance of the variable capacitance diode, thereby changing the resonance frequency. However, since the impedance at the point where the DC control voltage is applied is high, unnecessary AC voltage is likely to be superimposed on the DC control voltage, and when AC voltage is applied across the variable capacitance diode, the capacitance of the variable capacitance diode changes. However, the resonant frequency was modulated by 1M, which had the disadvantage of deteriorating 84.
本発明は上記にかんがみなされたもので、上記の欠点を
解消し良電子同調回路に関する。The present invention has been made in view of the above and relates to a good electronic tuning circuit which eliminates the above-mentioned drawbacks.
以下、本発明を実施例によシ説明する。The present invention will be explained below using examples.
第２図−）φ）および（０）は本発明の一実施例の回路
図であ〕１．第２図−）は第１図−）の、第２ｍ−）は
第１図伽）の、第２図（０）は第１図（０）の電子同調
回路に対応するものである。 一
本実施例は、コイル３のアースを除去し、アースに代っ
てコンデンサ８を介してアースし、コンデンｔ８に抵抗
９を接続するとともに、直流制御電圧の入力端子と抵抗
−の非接地備端子との間にコンデ：／１１を接続する。Figure 2-)φ) and (0) are circuit diagrams of one embodiment of the present invention.]1. 2-) corresponds to the electronic tuning circuit in FIG. 1-), 2m-) corresponds to the electronic tuning circuit in FIG. 1-), and FIG. 2(0) corresponds to the electronic tuning circuit in FIG. 1(0). In this embodiment, the ground of the coil 3 is removed, the ground is connected via a capacitor 8 instead of the ground, and a resistor 9 is connected to the capacitor t8. Connect the conde:/11 between the terminal and the terminal.
そこで直流制御電圧に交流電圧が重畳されて鱒な−とき
は、コンデンｔ１によ〉直流制御電圧は鐘断されるため
に第１ｇ（ａ）、＄ｓ）および−）と全く同様に作用す
る。また直流制御電圧−交流電圧が重畳されているとき
は、重畳された交流電圧はコンデンサ１を通して可変容
量ダイオード２ 、 ＠に同相で加えられることにな〕
、重畳され九交流成分による共振周波数変化が防止され
ることになる。Therefore, when an AC voltage is superimposed on the DC control voltage, the DC control voltage is cut off by the capacitor t1, so it acts exactly the same as in 1g(a), $s) and -). . Furthermore, when the DC control voltage and the AC voltage are superimposed, the superimposed AC voltage is applied to the variable capacitance diode 2, @ through the capacitor 1 in the same phase.]
, a change in the resonance frequency due to the superimposed nine AC components is prevented.
つぎに本発明の一実施例の変形実施例について説明する
。Next, a modified example of one embodiment of the present invention will be described.
第１図は本発明の一！Ｊ胸例の変形実施例の回路図であ
る。Figure 1 is one of the inventions! FIG. 7 is a circuit diagram of a modified embodiment of the J-chest example.
本贅形実流側紘第２−％）Ｋ示した本発明の一実施例に
おいて抵抗８に並列にトランジスタｑ１を並列に接続し
、トランジスタ（ｂをオ為−ト信号によって、建鳳−ト
オン時にトランジスタｑ１をオンＫＬ、ｆ為−トオフ時
にトランジスタｑ１をオフ状態にする。In one embodiment of the present invention shown in FIG. At times, the transistor q1 is turned on (KL), and when it is turned off, the transistor q1 is turned off.
そこで直流制御電圧によ）電子同調回路の周波数を変化
させているときのみ、直流制御電圧に重畳された交流電
圧が可変容量電圧に同相でかからなｉために、直流制御
電圧による電子同調回路の応答を早くすることができる
。Therefore, only when changing the frequency of the electronic tuning circuit (using the DC control voltage), since the AC voltage superimposed on the DC control voltage is not applied in phase with the variable capacitance voltage, the electronic tuning circuit using the DC control voltage response can be made faster.
以上説明しえ如く本発明によれば、一端がアースされ九
コイ〃と可変容量ダイオードとからなシ、可変容量ダイ
オードに印加す為逆方向直流制御電圧を変化させること
によシ可変容量ダイオードの容量を変化させて同調周波
数を変化させる電子同調回路において、コイルの一端と
アースとの間に一抵抗と第１のコンデンサとの並列回路
を挿入し、前記抵抗の非接地側と逆方向直流制御電圧の
入力端子との間に第２のコンデンサを接続して前記逆方
向直流制御電圧に重畳された交流電圧を前記可変容量ダ
イオードに同相で印加するようにし九ことにより、８／
！を向上させることができ、同調ずれを防止することが
で！１ゐ。As explained above, according to the present invention, one end of the variable capacitance diode is grounded and the variable capacitance diode is connected by changing the reverse direction DC control voltage to be applied to the variable capacitance diode. In an electronic tuning circuit that changes the tuning frequency by changing the capacitance, a parallel circuit consisting of a resistor and a first capacitor is inserted between one end of the coil and the ground, and the non-grounded side of the resistor is connected to reverse direct current control. By connecting a second capacitor between the voltage input terminal and applying the AC voltage superimposed on the reverse direction DC control voltage to the variable capacitance diode in the same phase, 8/
! You can improve your synchronization and prevent synchronization! 1ゐ.
第１図（転）、Φ）および（ｏ）Ｉｔ従来の電子同調回
路の一回路図、第２ｍ−）、Φ）および伜）は本発明の
一実施例の回路図である。
第３図は本発明の一実施例の変形例の回路図。
１・・・コイル、２および−・・・可変容量ダイオード
、１および８・・・コンデンサ、９・・・抵抗。
特許出願人 バイオ品７株式会社
（Ａ） （Ｂ）（Ａ）
（Ｂ）FIGS. 1(a), Φ) and (o) It are circuit diagrams of conventional electronic tuning circuits, and FIGS. 2m-), Φ) and 传) are circuit diagrams of one embodiment of the present invention. FIG. 3 is a circuit diagram of a modification of one embodiment of the present invention. 1... Coil, 2 and -... Variable capacitance diode, 1 and 8... Capacitor, 9... Resistor. Patent applicant Bioproducts 7 Co., Ltd. (A) (B) (A)
(B)
Claims (1)
なり、前記可変容量ダイオードに印加する逆方向ｌＩ流
制−電圧を変化させるととくよ〕前記可変容量ダイオー
ドの容量を変化させて同一周波数を変化させる電子同調
回路にお−で、前記コイルの一端とアースとの間に抵抗
と第１のコンデンサとの並列回路を挿入し、前記抵抗の
非接地側端子と逆方向直流制御電圧の入力端子との関に
第２のコンデンサを接続してなることを特徴とする電子
同調回路。It consists of a coil whose one end is grounded and a variable displacement diode, and the reverse direction I current control voltage applied to the variable capacitance diode is changed.]The capacitance of the variable capacitance diode is changed to change the same frequency. In the electronic tuning circuit, a parallel circuit consisting of a resistor and a first capacitor is inserted between one end of the coil and the ground, and the non-grounded terminal of the resistor is connected to the input terminal of the reverse DC control voltage. An electronic tuning circuit characterized in that a second capacitor is connected to the capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17449681A JPS5877315A (en) | 1981-11-02 | 1981-11-02 | Electronic tuning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17449681A JPS5877315A (en) | 1981-11-02 | 1981-11-02 | Electronic tuning circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5877315A true JPS5877315A (en) | 1983-05-10 |
| JPH0424885B2 JPH0424885B2 (en) | 1992-04-28 |
Family
ID=15979500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17449681A Granted JPS5877315A (en) | 1981-11-02 | 1981-11-02 | Electronic tuning circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5877315A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51130101A (en) * | 1975-05-06 | 1976-11-12 | Matsushita Electric Ind Co Ltd | Tuner |
-
1981
- 1981-11-02 JP JP17449681A patent/JPS5877315A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51130101A (en) * | 1975-05-06 | 1976-11-12 | Matsushita Electric Ind Co Ltd | Tuner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0424885B2 (en) | 1992-04-28 |
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