JPH03218484A - Signal switching circuit and signal generating method using the same - Google Patents
Signal switching circuit and signal generating method using the sameInfo
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- JPH03218484A JPH03218484A JP2014125A JP1412590A JPH03218484A JP H03218484 A JPH03218484 A JP H03218484A JP 2014125 A JP2014125 A JP 2014125A JP 1412590 A JP1412590 A JP 1412590A JP H03218484 A JPH03218484 A JP H03218484A
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- operational amplifier
- signal
- switch
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は信号切換回路およびそれを用いた信号発生方法
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal switching circuit and a signal generation method using the same.
従来の技術
従来の信号切換回路の一例を第２図に回路図で示し、従
来の信号発生方法と共に説明する。信号ＥＡは演算増幅
器１の正入力端子に、信号Ｅａは演算増幅器２の正入力
端子にそれぞれ入力される。2. Description of the Related Art An example of a conventional signal switching circuit is shown in a circuit diagram in FIG. 2, and will be explained together with a conventional signal generation method. The signal EA is input to the positive input terminal of the operational amplifier 1, and the signal Ea is input to the positive input terminal of the operational amplifier 2.
前記演算増幅器１は抵抗Ｒｌｌが前記演算増幅器ｌの出
力を負入力端子に負帰還することでボルテージフォロア
を構成している。前記演算増幅器２は抵抗Ｒ２１によっ
て、演算増幅器３は抵抗Ｒ３１によって同様にボルテー
ジフォロアを構成している。抵抗ＲＩＯは前記演算増幅
器ｌの、抵抗Ｒ２０は前記演算増幅器Ａ２の、抵抗Ｒ３
０は前記演算増幅器３の、それぞれ入力抵抗である。切
換器ＳＷＩのａ接点は前記演算増幅器１の出力に、ｂ接
点は前記演算増幅器２の出力にそれぞれ接続されている
。また切換器ＳＷＩの共通接点は前記演算増幅器３の正
入力端子に接続されている。今、前記切換器ＳＷＩがａ
接点の状態のとき、前記信号Ｅ＾が、前記演算増幅器１
より前記切換ａｓｗ１を通じて前記演算増幅器３の負人
力端子に入力され、前記演算増幅器の出力１０より出力
される。前記切換器ＳＷ１がｂ接点の状態のとき、前記
信号Ｅ８が、前記演算増幅器２より切換器ｓｗ１を通じ
て同様に前記演算増幅器３を通じて出力１０より出力さ
れる。第３図は従来例回路のタイミング図で、第３図（
ａ）は前記入力信号ＥＡの波形図、第３図（ｂ）は前記
入力信号Ｅ．の波形図、第３図（Ｃ）は出力ＩＯよりの
出力信号の波形図、第３図（ｄ）は前記切換器ＳＷＩの
接点の状態である。The operational amplifier 1 constitutes a voltage follower by a resistor Rll feeding back the output of the operational amplifier l to a negative input terminal. The operational amplifier 2 and the operational amplifier 3 respectively constitute a voltage follower by a resistor R21 and a resistor R31, respectively. The resistor RIO is the resistor R20 of the operational amplifier I, and the resistor R20 is the resistor R3 of the operational amplifier A2.
0 is the input resistance of the operational amplifier 3, respectively. The a contact of the switch SWI is connected to the output of the operational amplifier 1, and the b contact is connected to the output of the operational amplifier 2. Further, a common contact of the switch SWI is connected to the positive input terminal of the operational amplifier 3. Now, the switch SWI is a
When in the contact state, the signal E^ is connected to the operational amplifier 1.
The signal is then input to the negative power terminal of the operational amplifier 3 through the switch asw1, and is output from the output 10 of the operational amplifier. When the switch SW1 is in the b-contact state, the signal E8 is output from the operational amplifier 2 through the switch SW1, and similarly through the operational amplifier 3 from the output 10. Figure 3 is a timing diagram of a conventional circuit.
a) is a waveform diagram of the input signal EA, and FIG. 3(b) is a waveform diagram of the input signal E. FIG. 3(C) is a waveform diagram of the output signal from the output IO, and FIG. 3(d) is the state of the contacts of the switch SWI.
次に、従来の電気的デバイスの検査方法について、第４
図を用いて説明する。信号源Ａは信号発生器４０の入力
端子４１に、信号源Ｂは前記信号発生器４００入力端子
４２に入力される。前記信号ｍＡおよび前記信号源Ｂの
信号によって前記信号発生器４０より測定用信号が発生
され、被測定電気的デバイス５０および信号発生器６０
の入力端子６１にそれぞれ入力される。被測定電気的デ
バイスの出力は前記信号発生器６０の入力端子６２に入
力され、入力端子６１に入力された前記測定用信号と共
に被測定信号に合成される。前記信号発生器６０により
合成された前記被測定信号は測定装置７０に入力され、
前記測定用信号と前記被測定電気的デバイスの出力レベ
ルの比が測定される。上記検査方法によれば前記信号発
生器６０及び前記測定装置７０の誤差はほとんどキャン
セルされる。Next, we will discuss the conventional electrical device inspection method in the fourth section.
This will be explained using figures. The signal source A is input to the input terminal 41 of the signal generator 40, and the signal source B is input to the input terminal 42 of the signal generator 400. A measurement signal is generated by the signal generator 40 based on the signal mA and the signal from the signal source B, and the electrical device under test 50 and the signal generator 60
are respectively input to the input terminals 61 of. The output of the electrical device under test is input to the input terminal 62 of the signal generator 60, and combined with the measurement signal input to the input terminal 61 to form the signal under test. The signal under test synthesized by the signal generator 60 is input to a measuring device 70,
A ratio between the measurement signal and the output level of the electrical device under test is measured. According to the above testing method, the errors of the signal generator 60 and the measuring device 70 are almost canceled out.
発明が解決しようとする課題
しかしながら、従来の信号切換回路装置，信号発生器で
は切換器Ｓ Ｗ １のインピーダンスおよび負荷による
出力レヘルの低下ならびに周波数による出力レベルの変
動を防ぐため、演算増幅器３は不可欠であり、不経済且
つ、演算増幅器を２回信号が通るため、入出力間の位相
差が大きい等の問題があった。Problems to be Solved by the Invention However, in conventional signal switching circuit devices and signal generators, the operational amplifier 3 is indispensable in order to prevent the output level from decreasing due to the impedance and load of the switching device SW 1 and from changing the output level due to frequency. This is uneconomical, and since the signal passes through the operational amplifier twice, there are problems such as a large phase difference between input and output.
また、従来例では従来の信号発生器を２個使用している
ため、不経済である課題は特に重要である。Furthermore, since the conventional example uses two conventional signal generators, the problem of uneconomical problems is particularly important.
課題を解決するための手段
上記問題を解決するために，本発明の信号切換回路は、
信号源と第１の切換器との間に演算増幅器を備え且つ前
記信号源の出力時には前記演算増幅器の出力に接続され
た前記第１の切換器の出力制から前記演算増幅器の負入
力端子に負帰還を行い、前記信号源の非出力時には前記
演算増幅器の負入力端子とその出力を接続するための第
２の切換器を設けるように構成してある。Means for Solving the Problems In order to solve the above problems, the signal switching circuit of the present invention has the following features:
An operational amplifier is provided between the signal source and the first switching device, and when the signal source is output, the output terminal of the first switching device connected to the output of the operational amplifier is connected to the negative input terminal of the operational amplifier. Negative feedback is performed, and a second switch is provided for connecting the negative input terminal of the operational amplifier and its output when the signal source is not outputting.
また、本発明の信号発生方法は、信号源の出力時には前
記信号源が正入力端子に入力された演算増幅器の出力に
接続された第１の切換器の出力例と前記演算増幅器の負
人力端子とを第２の切換器で接続し、前記信号源の非出
力時には前記第１の切換器は前記演算増幅器の出力と翁
記第１の切換器の出力とを遮断し、前記第２の切換器は
前記演算増幅器の負入力端子と前記演算増幅器の出力と
を接続するように構成されている。Further, in the signal generation method of the present invention, when a signal source is output, an output example of a first switch connected to an output of an operational amplifier to which the signal source is inputted to a positive input terminal and a negative input terminal of the operational amplifier are provided. are connected by a second switch, and when the signal source is not outputting, the first switch cuts off the output of the operational amplifier and the output of the first switch, and the second switch The amplifier is configured to connect a negative input terminal of the operational amplifier and an output of the operational amplifier.
作用
上記構成により、信号源と第１の切換器との間に演算増
幅器を備え且つ前記信号源の出力時には前記演算増幅器
の出力に接続された前記第１の切換器の出力側から前記
演算増幅器の負入力端子に負帰還を行い、前記信号源の
非出力時には前記演算増幅器の負入力端子とその出力を
接続するための第２の切換器を設けることにより前記第
１の切換器の出力側に演算増幅器を設けることなしに出
力レベルの変動を少な《、入出力位相差の小さい信号切
換回路装置，信号発生回路を実現する。Effect With the above configuration, an operational amplifier is provided between a signal source and a first switching device, and when the signal source is output, the operational amplifier is connected from the output side of the first switching device to the output of the operational amplifier. By providing a second switch for providing negative feedback to the negative input terminal of the operational amplifier and connecting the negative input terminal of the operational amplifier and its output when the signal source is not outputting, the output side of the first switch is provided. To realize a signal switching circuit device and a signal generation circuit that have small output level fluctuations and a small input/output phase difference without providing an operational amplifier.
また、信号源の出力時には前記信号源が正入力端子に入
力された演算増幅器の出力に接続された第１の切換器の
出力側と前記演算増幅器の負入力端子とを第２の切換器
で接続し、前記信号源の非出力時には前記第１の切換器
は前記演算増幅器の出力と前記第１の切換器の出力とを
遮断し、前記第２の切換器は前記演算増幅器の負入力端
子と前記演算増幅器の出力とを接続することによって第
１の切換器の出力側に演算増幅器を設けることなしに出
力レベルの変動を少なく、入出力位相差の小さい信号発
生方法を実現する。Further, when the signal source is output, a second switch connects the output side of the first switch connected to the output of the operational amplifier to which the signal source is input to the positive input terminal and the negative input terminal of the operational amplifier. connected, and when the signal source is not outputting, the first switch cuts off the output of the operational amplifier and the output of the first switch, and the second switch disconnects the negative input terminal of the operational amplifier. By connecting the output of the first switching device and the output of the operational amplifier, it is possible to realize a signal generation method that reduces fluctuations in the output level and has a small input/output phase difference without providing an operational amplifier on the output side of the first switch.
実施例
以下、本発明の一実施例の信号切換回路装置，信号発生
回路，信号発生方法について第１図を参照して説明する
。信号Ｅ＾は演算増幅器１の正入力端子に、信号Ｅ．は
演算増幅器２の正入力端子にそれぞれ入力される。前記
演算増幅器１は抵抗Ｒｌｌが前記演算増幅器１の出力を
負入力端子に負帰還することでボルテージフォロアを構
成している。前記演算増幅器２は抵抗Ｒ２１によって同
様にボルテージフォロアを構成している。但し、抵抗Ｒ
ｌ １．Ｒ１２の抵抗値は切換器ＳＷ１２及び切換器Ｓ
Ｗ２２のインピーダンスより十分に高い。抵抗ＲＩＯは
前記演算増幅器１の、抵抗Ｒ２０は前記演算増幅器２の
それぞれ入力抵抗である。Embodiment Hereinafter, a signal switching circuit device, a signal generation circuit, and a signal generation method according to an embodiment of the present invention will be explained with reference to FIG. The signal E^ is connected to the positive input terminal of the operational amplifier 1, and the signal E. are respectively input to the positive input terminal of the operational amplifier 2. The operational amplifier 1 constitutes a voltage follower by negatively feeding back the output of the operational amplifier 1 to the negative input terminal through a resistor Rll. The operational amplifier 2 similarly constitutes a voltage follower with the resistor R21. However, the resistance R
l 1. The resistance value of R12 is the switch SW12 and switch S.
It is sufficiently higher than the impedance of W22. The resistor RIO is the input resistance of the operational amplifier 1, and the resistor R20 is the input resistance of the operational amplifier 2.
切換器ＳＷＩのａ接点は前記演算増幅器１の出力に、ｂ
接点は前記演算増幅器２の出力にそれぞれ接続されてい
る。また前記切換器ＳＷ１の共通点は出力１０である。The a contact of the switch SWI is connected to the output of the operational amplifier 1, and the b
The contacts are connected to the outputs of the operational amplifier 2, respectively. The common point of the switch SW1 is the output 10.
前記切換器ＳＷ１２のａ接点は前記出力ＩＯに接続され
、ｂ接点は前記演算増幅器１の出力に接続され、共通端
子は前記演算増幅器ｌの負入力端子に接続されている。The a contact of the switch SW12 is connected to the output IO, the b contact is connected to the output of the operational amplifier 1, and the common terminal is connected to the negative input terminal of the operational amplifier l.
切換器ＳＷ２２のａ接点は前記演算増幅器２の出力に、
ｂ接点は前記出力１０に、共通接点は前記演算増幅器２
の負入力端子に接続されている。今、前記切換器ＳＷＩ
，ＳＷ１２およびＳＷ２２がそれぞれａ接点のとき、前
記信号Ｅ＾は前記演算増幅器１の正入力端子に入力され
た後前記切換器ＳＷＩを通じて出力１０より出力される
。このとき出力は前記切換器ＳＷ１２を通じて前記演算
増幅器１の負入力端子に負帰還されてボルテージフォロ
アを構成している。演算増幅器の入力インピーダンスは
非常に高く、また、抵抗Ｒｌｌが前記切換器ＳＷＩ ２
のインピーダンスより十分に大きな値であるので、前記
切換器ＳＷ１のインピーダンスおよび負荷による出力レ
ベルの低下、周波数による出力レベルの変動は前記切換
器ＳＷＩの後に演算増幅器を設けないにもかかわらず、
従来例と同等の特性を得ている。一方、信号ＥＢは前記
演算増輻器２の正入力端子に入力されているが、前記切
換器ＳＷＩがａ接点の状態であるので出力されない。こ
のとき前記切換器ＳＷ２２により前記演算増幅器２はボ
ルテージフォロワを構成しており、動作の安定を保証し
ている。The a contact of the switch SW22 is connected to the output of the operational amplifier 2,
The b contact is connected to the output 10, and the common contact is connected to the operational amplifier 2.
is connected to the negative input terminal of Now, the switch SWI
, SW12 and SW22 are a-contacts, the signal E^ is input to the positive input terminal of the operational amplifier 1 and then output from the output 10 through the switch SWI. At this time, the output is negatively fed back to the negative input terminal of the operational amplifier 1 through the switch SW12, thereby forming a voltage follower. The input impedance of the operational amplifier is very high, and the resistor Rll is connected to the switch SWI2.
Since the value is sufficiently larger than the impedance of the switch SW1, the output level decreases due to the impedance and load of the switch SW1, and the output level fluctuates due to the frequency, even though no operational amplifier is provided after the switch SW1.
Characteristics equivalent to those of the conventional example have been obtained. On the other hand, although the signal EB is input to the positive input terminal of the operational amplifier 2, it is not output because the switch SWI is in the a-contact state. At this time, the operational amplifier 2 constitutes a voltage follower by the switch SW22, thereby ensuring stability of operation.
次に、前記切換器ＳＷＩ．ＳＷ１２およびＳＷ２２がｂ
接点の状態のとき、前記信号ＥＢは前記演算増幅器１よ
り前記切換器ＳＷＩを通じて前記出力１０より出力され
る。このとき出力は前記切換器ＳＷ２２を通じて前記演
算増幅器２の負入力端子に負帰還されてボルテージフォ
ロアを構成している。このため同様に出力レベルの低下
、周波数による出力レベルの変動は従来例と同等の特性
を得ている。上記本発明の一実施例である信号切換回路
装置，信号発生回路および信号発生方法の説明の波形図
を第３図に示す。第３図（ａ）は前記入力信号Ｅ＾の波
形図、第２図（ｂ）は前記入力信号ＥＢの波形図、第２
図（Ｃ）は出力１０よりの出力信号の波形図、第２図（
ｄ）は前記切換器ＳＷ１．ＳＷ１２およびＳＷ２２の接
点の状態である。なお、前記切換器ＳＷ１２のｂ接点及
び、ＳＷ２２のａ接点は省略することが可能である。ま
た前記信号Ｅ＾のみのバースト波が必要なときは、前記
切換器ＳＷ２２、前記演算増幅器２、前記抵抗Ｒ２０．
Ｒ２１も不要である。Next, the switch SWI. SW12 and SW22 are b
In the contact state, the signal EB is output from the operational amplifier 1 through the switch SWI and from the output 10. At this time, the output is negatively fed back to the negative input terminal of the operational amplifier 2 through the switch SW22, thereby forming a voltage follower. Therefore, similarly, the reduction in the output level and the fluctuation in the output level due to frequency have characteristics equivalent to those of the conventional example. FIG. 3 shows a waveform diagram illustrating a signal switching circuit device, a signal generating circuit, and a signal generating method according to an embodiment of the present invention. FIG. 3(a) is a waveform diagram of the input signal E^, FIG. 2(b) is a waveform diagram of the input signal EB, and FIG.
Figure (C) is a waveform diagram of the output signal from output 10, and Figure 2 (
d) is the switch SW1. This is the state of the contacts of SW12 and SW22. Note that the b contact of the switch SW12 and the a contact of SW22 can be omitted. Further, when a burst wave of only the signal E^ is required, the switch SW22, the operational amplifier 2, the resistor R20.
R21 is also unnecessary.
次に本発明の一実施例の信号切換回路を用いた電気的デ
バイスの検査方法について、第４図を用いて説明する。Next, a method for inspecting an electrical device using the signal switching circuit according to an embodiment of the present invention will be described with reference to FIG.
信号発生器４０および信号発生器６０が従来の信号発生
器から本発明実施例の信号発生器に換えられた以外は、
構成も説明も、従来例と全く同一である。しかし、前記
信号発生器４０及び前記信号発生器６０を従来の信号発
生器からこの信号発生器に換えたことで、信号発生回路
中の第１の切換器の出力側に演算増幅器を設けることな
しに出力レベルの変動を少なく、入出力位相差の小さい
電気的デバイスの検査が可能になる。Except that the signal generator 40 and the signal generator 60 were replaced with the signal generator of the embodiment of the present invention from the conventional signal generator.
The configuration and explanation are completely the same as the conventional example. However, by changing the signal generator 40 and the signal generator 60 from conventional signal generators to this signal generator, there is no need to provide an operational amplifier on the output side of the first switch in the signal generation circuit. This makes it possible to test electrical devices with small output level fluctuations and small input/output phase difference.
発明の効果
以上のように、本発明の信号切換回路は信号源と第１の
切換器との間に演算増幅器を備え、且つ前記信号源の出
力時には前記演算増幅器の負入力端子に負帰還を行い、
前記信号源の非出力時には前記演算増幅器の負入力端子
とその出力を接続するための第２の切換器を設けること
により前記第１の切換器の出力側に演算増幅器を設ける
ことなしに出力レベルの変動を少な《、入出力位相差を
小さくすることを可能にしている。Effects of the Invention As described above, the signal switching circuit of the present invention includes an operational amplifier between the signal source and the first switching device, and provides negative feedback to the negative input terminal of the operational amplifier when the signal source is output. conduct,
By providing a second switch for connecting the negative input terminal of the operational amplifier and its output when the signal source is not outputting, the output level can be changed without providing an operational amplifier on the output side of the first switch. This makes it possible to reduce fluctuations in the input and output phases and reduce the input/output phase difference.
また、本発明の信号発生方法は、信号源の出力時には前
記信号源が正入力端子に入力された演算増幅器の出力に
接続された第１の切換器の出力側と前記演算増幅器の負
入力端子とを第２の切換器で接続し、前記第２の切換器
は前記演算増幅器の負入力端子と前記演算増幅器の出力
とを接続することによって第１の切換器の出力側に演算
増幅器を設けることなしに出力レベルの変動を少なく、
入出力位相差を小さくすることを可能にしている。Further, in the signal generation method of the present invention, when the signal source is output, the signal source is connected to the output side of the first switching device connected to the output of the operational amplifier to which the positive input terminal is input, and the negative input terminal of the operational amplifier. are connected by a second switch, and the second switch connects the negative input terminal of the operational amplifier and the output of the operational amplifier, thereby providing an operational amplifier on the output side of the first switch. Reduces fluctuations in output level without
This makes it possible to reduce the input/output phase difference.
第１図は本発明の一実施例信号切換回路の回路図、第２
図は従来例回路の回路図、第３図は従来例回路および本
実施例回路を説明するためのタイミング波形図、第４図
は従来例および本実施例による電気的デバイスの検査装
置のブロック図である。
１．２．３・・・・・・演算増幅器、ＳＷＩ，ＳＷ１２
．ＳＷ２２・・・・・・切換器。FIG. 1 is a circuit diagram of a signal switching circuit according to an embodiment of the present invention, and FIG.
3 is a timing waveform diagram for explaining the conventional circuit and this example circuit. FIG. 4 is a block diagram of the electrical device inspection apparatus according to the conventional example and this example. It is. 1.2.3...Operation amplifier, SWI, SW12
．． SW22...Switcher.
Claims (3)
、前記演算増幅器の出力に接続された前記第１の切換器
の出力側から前記演算増幅器の負入力端子に負帰還を行
うことを特徴とする信号切換回路。(1) An operational amplifier is provided between a signal source and a first switch, and negative feedback is provided from the output side of the first switch connected to the output of the operational amplifier to the negative input terminal of the operational amplifier. A signal switching circuit characterized by:
端子とを接続するための第２の切換器を設けた請求項１
記載の信号切換回路。(2) Claim 1 further comprising a second switch for connecting the output side of the first switch and the negative input terminal of the operational amplifier.
The signal switching circuit described.
力された演算増幅器の出力に接続された第１の切換器の
出力側と前記演算増幅器の負入力端子とを第２の切換器
で接続し、前記信号源の非出力時には前記第１の切換器
は前記演算増幅器の出力と前記第１の切換器の出力側と
を遮断し、前記第２の切換器は前記演算増幅器の負入力
端子と前記演算増幅器の出力とを接続することを特徴と
する信号発生方法。(3) When the signal source is output, the output side of the first switch connected to the output of the operational amplifier to which the signal source is input to the positive input terminal and the negative input terminal of the operational amplifier are connected to the second switch. When the signal source is not outputting, the first switching device cuts off the output of the operational amplifier and the output side of the first switching device, and the second switching device cuts off the output side of the operational amplifier and the output side of the first switching device. A signal generation method, comprising connecting an input terminal and an output of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014125A JPH03218484A (en) | 1990-01-23 | 1990-01-23 | Signal switching circuit and signal generating method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014125A JPH03218484A (en) | 1990-01-23 | 1990-01-23 | Signal switching circuit and signal generating method using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03218484A true JPH03218484A (en) | 1991-09-26 |
Family
ID=11852405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014125A Pending JPH03218484A (en) | 1990-01-23 | 1990-01-23 | Signal switching circuit and signal generating method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03218484A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015102334A (en) * | 2013-11-21 | 2015-06-04 | 株式会社昭和真空 | Piezoelectric element frequency measurement device and frequency measurement method |
-
1990
- 1990-01-23 JP JP2014125A patent/JPH03218484A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015102334A (en) * | 2013-11-21 | 2015-06-04 | 株式会社昭和真空 | Piezoelectric element frequency measurement device and frequency measurement method |
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