JPS6145883B2 - - Google Patents
Info
- Publication number
- JPS6145883B2 JPS6145883B2 JP983180A JP983180A JPS6145883B2 JP S6145883 B2 JPS6145883 B2 JP S6145883B2 JP 983180 A JP983180 A JP 983180A JP 983180 A JP983180 A JP 983180A JP S6145883 B2 JPS6145883 B2 JP S6145883B2
- Authority
- JP
- Japan
- Prior art keywords
- switch
- resistor
- capacitor
- oscillation
- oscillation frequency
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/26—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
【発明の詳細な説明】
本発明は簡単な構成で発振周波数の切替えを行
なうことのできるウイーンブリツジ型発振回路に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Wien Bridge type oscillation circuit that can switch oscillation frequencies with a simple configuration.
従来のウイーンブリツジ型発振回路は第１図に
示すように連動する周波数切替スイツチ１，６、
抵抗２，３，４，６、コンデンサ８、演算増幅器
９、非線形抵抗１０，１１により構成されてい
る。 The conventional Wien bridge type oscillator circuit has interlocking frequency changeover switches 1, 6, as shown in FIG.
It is composed of resistors 2, 3, 4, and 6, a capacitor 8, an operational amplifier 9, and nonlinear resistors 10 and 11.
このような回路においては発振周波数を切替え
るためには２個の抵抗２，６を切替える必要があ
るため、２つのスイツチ１，６を設ける必要があ
る。 In such a circuit, it is necessary to switch the two resistors 2 and 6 in order to switch the oscillation frequency, so it is necessary to provide two switches 1 and 6.
本発明による発振回路は１個のスイツチを用い
て発振周波数の切替えが行なえるようにしたもの
で、以下にその実施例とともに説明する。 The oscillation circuit according to the present invention is capable of switching the oscillation frequency using one switch, and will be described below along with an embodiment thereof.
第２図において、２１は発振周波数を切替える
ためのスイツチ、２２〜２５はコンデンサ２６，
２７とともに発振周波数を決める抵抗、２８は演
算増幅器である。２９，３０はひずみの少ない正
弦波を得るために設けた非線形抵抗で、通常は２
９がサーミスタで、３０が抵抗、または２９が抵
抗で３０がポジテイブサーミスタである。 In FIG. 2, 21 is a switch for changing the oscillation frequency, 22 to 25 are capacitors 26,
A resistor 27 determines the oscillation frequency, and 28 is an operational amplifier. 29 and 30 are nonlinear resistors installed to obtain a sine wave with little distortion, and are usually 2
9 is a thermistor and 30 is a resistor, or 29 is a resistor and 30 is a positive thermistor.
次にこの実施例の動作について説明する。スイ
ツチ２１が「断」のときは発振周波数ｆOFFと正
弦波を得るための増幅器の利得ＧOFFは次の式で
表わされる。 Next, the operation of this embodiment will be explained. When the switch 21 is "OFF", the oscillation frequency f OFF and the gain G OFF of the amplifier for obtaining a sine wave are expressed by the following equation.
ＧOFF＝Ｒ２２＋Ｒ２３／Ｒ２４＋Ｒ２５＋Ｃ２７／Ｃ
２６＋１……(2)
ここで計算を簡単にするためにC27＝C26＝Ｃおよ
び
R22＋R23＝R24＋R25＝Ｒ ……(3)
とおくと、上式は
ｆOFF＝１／２πＣＲ ……(4)
ＧOFF＝３ ……(5)
次にスイツチ２１を「接」にすると伝達関数Ｓは
となる。 G OFF =R 22 +R 23 /R 24 +R 25 +C 27 /C
26 +1...(2) Here, to simplify the calculation, let C 27 = C 26 = C and R 22 + R 23 = R 24 + R 25 = R...(3), then the above equation becomes f OFF = 1/2πCR ...(4) G OFF =3 ...(5) Next, when switch 21 is set to "close", the transfer function S becomes becomes.
従つて発振条件ｆpoおよびＧpoは
Ｇpo＝Ｒ２２／Ｒ２５＋Ｒ２３Ｒ２４／Ｒ２５＋２…
…(8)
ここでスイツチ２１が「断」のときと「接」の
ときで同じ振幅の正弦波を得るためには式(5)，(6)
より次のようになる。 Therefore, the oscillation conditions f po and G po are G po =R 22 /R 25 +R 23 R 24 /R 25 +2...
...(8) Here, in order to obtain a sine wave with the same amplitude when the switch 21 is "off" and "on", formulas (5) and (6) are used.
It becomes as follows.
Ｇpo＝Ｒ２２／Ｒ２５＋Ｒ２３Ｒ２４／Ｒ２５＋２＝
３
∴ R22＋R23R24＝R25 ……(9)
また式(3)より次式が成立する。G po =R 22 /R 25 +R 23 R 24 /R 25 +2=
3 ∴ R 22 + R 23 R 24 = R 25 ...(9) Also, the following equation holds true from equation (3).
R22＝Ｒ−R23，R25＝Ｒ−R24 ……(10)
これを式(9)に代入して整理すると
式(9)，(10)を式(7)に代入して整理すると
すなわち、以上をまとめると式(3)，(11)の条件に
なるようにR22，R23，R24，R25を選ぶと発振正弦
波の大きさはスイツチ２１が「断」と「接」とで
変化せず、発振周波数は「断」のとき式(4)で
「接」のときは式(12)で表わされる。 R 22 = R-R 23 , R 25 = R-R 24 ...(10) Substituting this into equation (9) and organizing it, we get Substituting equations (9) and (10) into equation (7) and rearranging it, we get In other words, to summarize the above, if R 22 , R 23 , R 24 , and R 25 are selected so as to meet the conditions of equations (3) and (11), the magnitude of the oscillating sine wave will change depending on whether the switch 21 is "disconnected" or "connected."", and the oscillation frequency is expressed by equation (4) when it is "off" and equation (12) when it is "connected."
以上で説明した第２図の実施例は抵抗をスイツ
チする場合を述べたが、第３図のように発振周波
数を決定する抵抗とコンデンサを第２図の場合と
は入れ換えた構成にし、コンデンサをスイツチし
てもその効果は同じである。 In the embodiment shown in Fig. 2 explained above, the case was described in which the resistor was switched, but as shown in Fig. 3, the resistor and capacitor that determine the oscillation frequency are replaced with those in the case of Fig. 2, and the capacitor is switched. Even if you switch, the effect is the same.
また第４図に示すように３周波数を切替える場
合、またはそれ以上の周波数を切替える場合も同
様に実施できる。 Further, as shown in FIG. 4, switching of three frequencies or switching of more than three frequencies can be carried out in the same manner.
また、スイツチに機械的なスイツチを使用して
もトランジスタのような半導体スイツチを使用し
ても同様に実施できる。 Further, the present invention can be implemented in the same manner by using a mechanical switch or a semiconductor switch such as a transistor.
以上実施例より明らかなようにウイーンブリツ
ジ型発振器の周波数を切替えるのに一つのスイツ
チで良いため、小型化、経済化が計れてその工業
的価値は大である。 As is clear from the above embodiments, since only one switch is required to change the frequency of the Wien Bridge type oscillator, it can be made smaller and more economical, and has great industrial value.
第１図は従来のウイーンブリツジ型発振回路の
結線図、第２図は本発明の一実施例によるウイー
ンブリツジ型発振回路の結線図、第３図、第４図
は他の実施例の結線図である。
２１……スイツチ、２２〜２５……スイツチ、
２６，２７……コンデンサ、２８……演算増幅
器。
Fig. 1 is a wiring diagram of a conventional Wien Bridge type oscillation circuit, Fig. 2 is a wiring diagram of a Wien Bridge type oscillator circuit according to an embodiment of the present invention, and Figs. It is a wiring diagram. 21...Switch, 22-25...Switch,
26, 27... Capacitor, 28... Operational amplifier.
Claims (1)
間に第１の抵抗と第１のコンデンサを直列接続す
ると共に、前記正相入力点と地気の間に第２の抵
抗と第２のコンデンサを並列接続して発振回路を
形成し、前記第１の抵抗と第２の抵抗の中間点同
志の間或いは前記第１のコンデンサと第２のコン
デンサの中間点同志の間のいずれかにスイツチを
設け、前記スイツチを開または閉に切替えて発信
周波数を切替えるようにしたウイーンブリツジ型
発振回路。1 A first resistor and a first capacitor are connected in series between the output point of the amplifier and the positive phase input point of the amplifier, and a second resistor and a second capacitor are connected in series between the positive phase input point and the ground. An oscillation circuit is formed by connecting capacitors in parallel, and a switch is connected between the midpoints of the first resistor and the second resistor or between the midpoints of the first capacitor and the second capacitor. A Wien Bridge type oscillation circuit, wherein the oscillation frequency is changed by opening or closing the switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP983180A JPS56106405A (en) | 1980-01-29 | 1980-01-29 | Wien bridge type oscillating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP983180A JPS56106405A (en) | 1980-01-29 | 1980-01-29 | Wien bridge type oscillating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56106405A JPS56106405A (en) | 1981-08-24 |
| JPS6145883B2 true JPS6145883B2 (en) | 1986-10-11 |
Family
ID=11731069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP983180A Granted JPS56106405A (en) | 1980-01-29 | 1980-01-29 | Wien bridge type oscillating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56106405A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0641589U (en) * | 1992-11-16 | 1994-06-03 | 起夫 西田 | Body wash |
-
1980
- 1980-01-29 JP JP983180A patent/JPS56106405A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0641589U (en) * | 1992-11-16 | 1994-06-03 | 起夫 西田 | Body wash |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56106405A (en) | 1981-08-24 |
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