JPH049780A - Dc-squid measuring device - Google Patents
Dc-squid measuring deviceInfo
- Publication number
- JPH049780A JPH049780A JP2112971A JP11297190A JPH049780A JP H049780 A JPH049780 A JP H049780A JP 2112971 A JP2112971 A JP 2112971A JP 11297190 A JP11297190 A JP 11297190A JP H049780 A JPH049780 A JP H049780A
- Authority
- JP
- Japan
- Prior art keywords
- output
- filter
- circuit
- phase
- output terminal
- 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 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ＤＣ−ＳＱＵＩＤ （直流型超伝導量子干渉
素子）の電流−電圧特性又は磁束−電圧特性を測定する
、ＤＣ−ＳＱＵＩＤ測定装置に関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a DC-SQUID measurement device that measures the current-voltage characteristics or magnetic flux-voltage characteristics of a DC-SQUID (direct current type superconducting quantum interference device). It is something.
本発明は、ＤＣ−ＳＱＵＩＤの電流−電圧特性又は磁束
−電圧特性を測定するＤＣ−ＳＱＵＩＤ測定装置におい
て、電流又は磁束のモニター出力となる発振回路の出力
と、電圧のモニター出力となるフィルターの出力との間
で生じる位相差を、発振回路のモニター出力と、フィル
ターの出力の両方又はどちらか一方に位相補償回路を設
けることによりなくしたものである。The present invention provides a DC-SQUID measuring device for measuring current-voltage characteristics or magnetic flux-voltage characteristics of a DC-SQUID, in which the output of an oscillation circuit serves as a monitor output for current or magnetic flux, and the output of a filter serves as a monitor output for voltage. The phase difference that occurs between the oscillation circuit and the filter is eliminated by providing a phase compensation circuit at either or both of the monitor output of the oscillation circuit and the output of the filter.
従来は、第２図に示すような構成であった。 Conventionally, the configuration was as shown in FIG.
発振回路１の出力を、Ｖ／Ｉ変換回路２で１ｉ流に変換
し、ＤＣ−ＳＱＵＩＤ３に入力し、その時のＤＣ−ＳＱ
ＵＩＤ３の両端の電位差を、差動アンプ４で検出し、フ
ィルター５で雑音を除去し出力していた。そして、この
フィルター５の出力をモニターする第２の出力端子６と
発振回路１の出力をモニターする第１の出力端子８をそ
れぞれオシロスコープに接続し、その波形をＸＹモード
で表示させることにより、ＤＣ−ＳＱＵＩＤ３の電流−
電圧特性と磁束−電圧特性を測定していた。The output of the oscillation circuit 1 is converted to 1i current by the V/I conversion circuit 2, and inputted to the DC-SQUID 3, and the DC-SQ at that time is
The potential difference between both ends of the UID 3 was detected by a differential amplifier 4, noise was removed by a filter 5, and the result was output. Then, by connecting the second output terminal 6 for monitoring the output of the filter 5 and the first output terminal 8 for monitoring the output of the oscillation circuit 1 to an oscilloscope and displaying the waveform in the XY mode, the DC -Current of SQUID3-
The voltage characteristics and magnetic flux-voltage characteristics were measured.
従来のような構成によると、フィルター５の影響により
、第１の出力端子８の信号と、第２の出力端子６の信号
との間に位相差が生じ、これを小さくすると、雑音が十
分に除去できなくなってしまうという問題点があった。According to the conventional configuration, a phase difference occurs between the signal at the first output terminal 8 and the signal at the second output terminal 6 due to the influence of the filter 5. If this is reduced, the noise is sufficiently reduced. There was a problem that it could not be removed.
本発明は、これらの問題点を解決するために、フィルタ
ー５と第２の出力端子６との間か、発振回路と第１の出
力端子の両方又はどちらか一方に位相補償回路を設けた
ことを特徴とする。In order to solve these problems, the present invention provides a phase compensation circuit between the filter 5 and the second output terminal 6, or between the oscillation circuit and the first output terminal, or both or either one of the oscillation circuits and the first output terminal. It is characterized by
前記のような構成によれば、フィルター５の雑音の減衰
率を上げても、そのために生じる発振回路１の出力とフ
ィルター５の出力との間の位相差は、位相補償回路によ
りキャンセルされ、位相差がなく、雑音も十分に除去さ
れた電流−電圧特性と、磁束−電圧特性が測定できるよ
うになる。According to the above configuration, even if the noise attenuation rate of the filter 5 is increased, the phase difference between the output of the oscillation circuit 1 and the output of the filter 5 caused by this is canceled by the phase compensation circuit, and the phase difference is reduced by the phase compensation circuit. Current-voltage characteristics and magnetic flux-voltage characteristics can be measured without phase difference and with noise sufficiently removed.
次に本発明の実施例を、図面に従って説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明の実施例である。発振回路１の出力は
、一方はＶ／Ｉ変換回路２に、もう一方は位相補償手段
７に接続し、Ｖ／Ｉ変換回路２は発振回路１の出力電圧
信号を電流信号に変換し、ＤＣ−ＳＱＵＩＤ３に入力す
る。差動アンプ４はこの時のＤＣ−５ＱＵＩＤ３の両端
の電位差を検出するように接続され、それを増幅し、電
圧信号として出力する。差動アンプ４に接続されたフィ
ルター５は、この電圧信号をフィルターリングして、フ
ィルター５の出力に接続する第２の出力端子６から出力
する。この時、フィルター５の時定数を大きくし、雑音
のフィルターリングの効果を上げると、フィルター５の
出力と発振回路１との間に住しる位相差は大きくなる。FIG. 1 shows an embodiment of the invention. The output of the oscillation circuit 1 is connected on one side to the V/I conversion circuit 2 and on the other to the phase compensation means 7, and the V/I conversion circuit 2 converts the output voltage signal of the oscillation circuit 1 into a current signal, and converts the output voltage signal from the oscillation circuit 1 into a current signal. - Input to SQUID3. The differential amplifier 4 is connected to detect the potential difference between both ends of the DC-5QUID 3 at this time, amplifies it, and outputs it as a voltage signal. A filter 5 connected to the differential amplifier 4 filters this voltage signal and outputs it from a second output terminal 6 connected to the output of the filter 5. At this time, if the time constant of the filter 5 is increased to improve the noise filtering effect, the phase difference between the output of the filter 5 and the oscillation circuit 1 will increase.
が、発振回路１と第１の出力端子８の間に、この位相差
をキャンセルするように、フィルター５で使用している
フィルムターと同様のフィルターで構成された位相補償
回路７を設け、この位相補償回路７で発振回路１の信号
の位相をずらし、フィルター５との間の位相差をなくし
て、第１の出力端子８から出力する。However, a phase compensation circuit 7 composed of a filter similar to the film filter used in the filter 5 is provided between the oscillation circuit 1 and the first output terminal 8 so as to cancel this phase difference. The phase of the signal from the oscillation circuit 1 is shifted by the phase compensation circuit 7 to eliminate the phase difference between the signal and the filter 5, and the signal is output from the first output terminal 8.
第１図においては、このフィルター５と位相補償回路７
とに、ローパスフィルターを用いた実施例を示す０位相
補償回路７は可変抵抗９を用いることにより、時定数の
調整や変更ができる構成になっている。In FIG. 1, this filter 5 and phase compensation circuit 7 are shown.
In addition, the 0-phase compensation circuit 7, which is an embodiment using a low-pass filter, has a configuration in which the time constant can be adjusted or changed by using a variable resistor 9.
位相補償回路７とフィルター５は、ローパスフィルター
以外のフィルターの使用も可能である。As the phase compensation circuit 7 and the filter 5, it is also possible to use a filter other than a low-pass filter.
又、位相補償回路７とフィルター５は必ずしも同様のフ
ィルターで構成しなくともよく、例えば、第１図の位相
補償回路７を中心周波数の調整や変更が可能なバンドパ
スフィルターで構成することや、移相量の調節が可能な
移相回路で構成することも可能である。Further, the phase compensation circuit 7 and the filter 5 do not necessarily have to be constructed with the same filters; for example, the phase compensation circuit 7 shown in FIG. 1 may be constructed with a bandpass filter whose center frequency can be adjusted or changed; It is also possible to configure it with a phase shift circuit that can adjust the amount of phase shift.
第３図は、本発明の他の実施例を示す図であり、発振回
路１の出力の一方が、第１の出力端子８に直結している
点と、フィルター５と第２の出力端子６との間に位相補
償回路７が設けられている点を除けば、構成は第１図と
同様である。例えば、この移相補償回路７を移相回路で
構成した場合、この移相回路で、発振回路１の出力と、
フィルター５の出力との間の位相差の分だけ、フィルタ
ー５の出力の位相を逆にずらし、位相差をキャンセルし
て、第２の出力端子に出力するものである。FIG. 3 is a diagram showing another embodiment of the present invention, in which one of the outputs of the oscillation circuit 1 is directly connected to the first output terminal 8, and the filter 5 and the second output terminal 6 are connected directly to the first output terminal 8. The configuration is the same as that in FIG. 1 except that a phase compensation circuit 7 is provided between the two. For example, if this phase shift compensation circuit 7 is configured with a phase shift circuit, the output of the oscillation circuit 1 and
The phase of the output of the filter 5 is reversely shifted by the phase difference between the output of the filter 5 and the output of the filter 5, the phase difference is canceled, and the output is output to the second output terminal.
本測定装置は、ＤＣ−ＳＱＵＩＤ以外にも、ジョセフソ
ン素子を使用した回路の電流−電圧特性や磁束−電圧特
性の測定も可能である。In addition to DC-SQUID, this measuring device can also measure current-voltage characteristics and magnetic flux-voltage characteristics of circuits using Josephson elements.
以上説明したように、本発明によれば、第１の出力端子
８のモニター出力と第２の出力端子６のモニター出力の
間には位相差は生じず、同時にフィルター５における雑
音のフィルターリングの効果を上げることができ、低雑
音で位相差のない、電流−電圧特性や磁束−電圧特性の
測定を実現できるという効果がある。As explained above, according to the present invention, no phase difference occurs between the monitor output of the first output terminal 8 and the monitor output of the second output terminal 6, and at the same time, noise filtering in the filter 5 is reduced. This has the effect of making it possible to measure current-voltage characteristics and magnetic flux-voltage characteristics with low noise and no phase difference.
第１図は本発明の実施例を示す図、第２図は従来例を示
す図、第３図は本発明の他の実施例を示す図である。
・発振回路
・Ｖ／Ｉ変換回路
・ＤＣ−３ＱＵ Ｉ Ｄ
差動アンプ
フィルター
・第２の出力端子
・位相補償回路
・第１の出力端子
可変抵抗
出願人 セイコー電子工業株式会社
代理人 弁理士 林 敬 之 助FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a conventional example, and FIG. 3 is a diagram showing another embodiment of the present invention.・Oscillation circuit ・V/I conversion circuit ・DC-3QUID differential amplifier filter ・Second output terminal ・Phase compensation circuit ・First output terminal variable resistor Applicant Seiko Electronic Industries Co., Ltd. Agent Patent attorney Takashi Hayashi Nosuke
Claims (1)
第１の出力端子と、前記出力信号を入力とするＤＣ−Ｓ
ＱＵＩＤと、このＤＣ−ＳＱＵＩＤの両端の電位差を検
出する差動アンプと、この差動アンプの出力側に接続す
るフィルターと、このフィルターの出力信号をモニター
する第２の出力端子とからなり、前記第１の出力端子の
出力と前記第２の出力端子の出力の位相差を補償する位
相補償回路を設けたことを特徴とする、ＤＣ−ＳＱＵＩ
Ｄ測定装置。an oscillation circuit, a first output terminal for monitoring an output signal of the oscillation circuit, and a DC-S that receives the output signal as an input.
It consists of a QUID, a differential amplifier that detects the potential difference between both ends of this DC-SQUID, a filter connected to the output side of this differential amplifier, and a second output terminal that monitors the output signal of this filter. A DC-SQUI characterized by comprising a phase compensation circuit that compensates for the phase difference between the output of the first output terminal and the output of the second output terminal.
D measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112971A JPH049780A (en) | 1990-04-27 | 1990-04-27 | Dc-squid measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112971A JPH049780A (en) | 1990-04-27 | 1990-04-27 | Dc-squid measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH049780A true JPH049780A (en) | 1992-01-14 |
Family
ID=14600144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2112971A Pending JPH049780A (en) | 1990-04-27 | 1990-04-27 | Dc-squid measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049780A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448308A (en) * | 1993-02-05 | 1995-09-05 | Thomson Consumer Electronics, Inc. | Apparatus for clamping a video signal level |
| JP2006329835A (en) * | 2005-05-26 | 2006-12-07 | Japan Science & Technology Agency | Electronic circuit for superconducting quantum interference device |
| US7966157B2 (en) | 2007-09-03 | 2011-06-21 | Denso Corporation | Signal processing circuit for rotation detector and method for detecting rotation of object |
-
1990
- 1990-04-27 JP JP2112971A patent/JPH049780A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448308A (en) * | 1993-02-05 | 1995-09-05 | Thomson Consumer Electronics, Inc. | Apparatus for clamping a video signal level |
| JP2006329835A (en) * | 2005-05-26 | 2006-12-07 | Japan Science & Technology Agency | Electronic circuit for superconducting quantum interference device |
| US7966157B2 (en) | 2007-09-03 | 2011-06-21 | Denso Corporation | Signal processing circuit for rotation detector and method for detecting rotation of object |
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