JPH0480667A - Ac vector detector - Google Patents
Ac vector detectorInfo
- Publication number
- JPH0480667A JPH0480667A JP19463190A JP19463190A JPH0480667A JP H0480667 A JPH0480667 A JP H0480667A JP 19463190 A JP19463190 A JP 19463190A JP 19463190 A JP19463190 A JP 19463190A JP H0480667 A JPH0480667 A JP H0480667A
- Authority
- JP
- Japan
- Prior art keywords
- polarity
- integration
- integrators
- integrating
- phase
- 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
- 230000010354 integration Effects 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 abstract description 7
- 238000012935 Averaging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は各種の回路のインピーダンス特性、伝達特性
等を測定することに用いることができる交流ベクトル検
波装置に関する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an AC vector detection device that can be used to measure impedance characteristics, transfer characteristics, etc. of various circuits.
［従来の技術〕 第４図に従来の交流ベクトル検波装置を示す。[Conventional technology] FIG. 4 shows a conventional AC vector detection device.
図中１は基準信号発生部を示す。この基準信号発生部１
から例えば正弦波の基準信号ｖ、、、＝Ｓｉｎωｔが測
定対象２に与えられる。In the figure, 1 indicates a reference signal generating section. This reference signal generator 1
For example, a sine wave reference signal v, . . . =Sinωt is applied to the measurement object 2 from
測定対象２の応答出力信号はバッファ増幅器３を通して
位相検波器４Ａ、４Ｂに入力される０位相検波器４Ａ、
４Ｂの基準信号入力端子には基準信号発生部１から互に
直交する位相差を持つ、例えば正弦波ｓｉｎωｔと余弦
波ｃｏｓωを又は直交する位相差を持つ方形波を与える
。The response output signal of the measurement object 2 is inputted to the phase detectors 4A and 4B through the buffer amplifier 3.
To the reference signal input terminal 4B, a sine wave sin ωt and a cosine wave cos ω having mutually orthogonal phase differences, for example, or a square wave having orthogonal phase differences are applied from the reference signal generator 1.
位相検波器４Ａ、４Ｂの検波出力は積分器５Ａ。The detection outputs of the phase detectors 4A and 4B are sent to the integrator 5A.
５Ｂで積分され実数ベクトル成分ＶＲ，と、虚数ベクト
ル成分Ｖ１．とに分離され、スイッチＳ。5B, the real vector component VR, and the imaginary vector component V1. and switch S.
で選択されてＡＤ変換器６でＡＤ変換され、演夏表示器
７で演頁し、インピーダンス特性等が算出され表示され
る。尚８は積分器５Ａ、５Ｂを構成するスイッチＳ、−
Ｓ、及びスイ、７チＳ、を切替制御する制御器を示す。It is selected, AD-converted by the AD converter 6, displayed on the summer display 7, and impedance characteristics etc. are calculated and displayed. Note that 8 indicates switches S, -, which constitute the integrators 5A and 5B.
This figure shows a controller that switches and controls S, SW, and 7-S.
「発明が解決しようとする課題」
積分器５Ａ、５Ｂにおいて、積分開始に先だってスイッ
チＳ２及びＳ、がオンに制御され、積分コンデンサＣ１
及びＣ２の電荷を放電させ初期化する。"Problem to be Solved by the Invention" In the integrators 5A and 5B, switches S2 and S are controlled to be turned on prior to the start of integration, and the integrating capacitor C1
And the charge of C2 is discharged and initialized.
然し乍ら、積分コンデンサＣ１及びＣ２は理想コンデン
サでないから初期化しても初期化以前の電圧値によって
誘電体吸収電荷が残り、この誘電体吸収電荷によって測
定の安定度を悪化させたり、精度を悪くさせる。However, since the integrating capacitors C1 and C2 are not ideal capacitors, even if they are initialized, a dielectric absorption charge remains due to the voltage value before initialization, and this dielectric absorption charge deteriorates the stability and accuracy of measurement.
またリーク電流誤差、クロストーク誤差等も受は易い。It is also susceptible to leakage current errors, crosstalk errors, etc.
因みに実数ベクトル成分ＶＲ，と虚数ベクトル成分Ｖｌ
、は
ＶＲ，＝Ａ−ｃｏｓ ａ＋６１
Ｖ ［、＝Ａ−ｓｉｎθ＋ε２
で表わされ、Ｃ１，Ｃ２が誘電体吸収電荷及びリーク電
流誤差、クロストーク誤差の総和である。Incidentally, the real vector component VR and the imaginary vector component Vl
, is expressed as VR,=A-cos a+61 V[,=A-sin θ+ε2, where C1 and C2 are the sum of dielectric absorption charge, leakage current error, and crosstalk error.
「課題を解決するための手段」
この発明では積分器に与える位相検波出力信号の極性を
１積分動作毎に反転させる極性切替手段を設ける。この
発明の構成によれば積分器に与えられる位相検波出力信
号の極性が１積分動作毎に反転されるから、積分器に積
分させる積分電圧は１積分動作毎に極性が反転する。"Means for Solving the Problems" In the present invention, a polarity switching means is provided for inverting the polarity of the phase detection output signal given to the integrator every integration operation. According to the configuration of the present invention, the polarity of the phase detection output signal applied to the integrator is inverted every integration operation, so the polarity of the integral voltage integrated by the integrator is inverted every integration operation.
従って平均すると積分コンデンサに生しる誘電体吸収電
荷は除去され、またリーク電流誤差及びクロストーク誤
差も演算上で除去される。Therefore, on average, the dielectric absorption charge generated in the integrating capacitor is removed, and leakage current errors and crosstalk errors are also removed in calculations.
よってこの発明によれば測定の安定度を向上させること
ができ、また測定精度を高めることができる。Therefore, according to the present invention, the stability of measurement can be improved, and the measurement accuracy can also be improved.
「実施例」
第１図にこの発明の一実施例を示す。第１図において、
１は基準信号発生部、２は測定対象、３はバッファ増幅
器、４Ａ、４Ｂは位相検波器、５Ａ、５Ｂは積分器、６
はＡＤ変換器、７は演算表示器、８は制御器を示す点は
従来の説明と同しである。"Embodiment" FIG. 1 shows an embodiment of the present invention. In Figure 1,
1 is a reference signal generator, 2 is a measurement object, 3 is a buffer amplifier, 4A, 4B are phase detectors, 5A, 5B are integrators, 6
This is the same as the conventional explanation in that numeral 7 indicates an AD converter, 7 indicates a calculation display, and 8 indicates a controller.
この発明においては積分器５Ａ、５Ｂに入力する位相検
波出力信号の極性を１積分動作毎に反転させる極性切替
手段７を設けた構成を特徴とするものである。The present invention is characterized by a configuration in which a polarity switching means 7 is provided for inverting the polarity of the phase detection output signal input to the integrators 5A and 5B every integration operation.
つまりこの例ではバッファ増幅器３として差動出力型の
バッファ増幅器を用い、このバッファ増幅器３の出力側
に極性切替手段９を設けた場合を示す、この例では極性
切替手段９をスイッチＳ。That is, in this example, a differential output type buffer amplifier is used as the buffer amplifier 3, and a polarity switching means 9 is provided on the output side of the buffer amplifier 3. In this example, the polarity switching means 9 is connected to a switch S.
によって構成した場合を示す、スイッチＳ、を積分器Ｉ
Ａ、１Ｂの１積分動作毎に切替ることにより位相検波器
４Ａと４Ｂの出力電圧の極性を切替ることかできる。The switch S is configured as an integrator I.
The polarity of the output voltages of the phase detectors 4A and 4B can be switched by switching each integral operation of A and 1B.
第２図に各スイッチＳ、〜Ｓ、の動作と、積分器５Ａ、
５Ｂの動作を示す、積分器５Ａと５Ｂに設けたスイッチ
Ｓ！とＳ、及びＳｌとＳ、、Ｓ。FIG. 2 shows the operation of each switch S, ~S, and the integrator 5A,
Switch S provided in integrators 5A and 5B shows the operation of 5B! and S, and Sl and S,,S.
とＳ、は第２図Ａ、Ｂ、Ｃに示すように同時にオン、オ
フ動作し、積分器５Ａと５Ｂは同時に積分とリセット動
作を繰返す。and S are simultaneously turned on and off as shown in FIG. 2A, B, and C, and the integrators 5A and 5B simultaneously repeat the integration and reset operations.
つまりスイッチＳ、とＳｈがオンになる毎に積分器５Ａ
と５Ｂの積分電圧はリセットされる。このリセットの周
期Ｔが積分器５Ａと５Ｂの１動作周期となる。積分動作
はスイッチＳ２とＳ、がオン、スイッチＳ１と３４がオ
フの状態で実行される。In other words, every time switches S and Sh are turned on, the integrator 5A
The integrated voltage of and 5B is reset. This reset cycle T is one operating cycle of the integrators 5A and 5B. The integration operation is performed with switches S2 and S on and switches S1 and 34 off.
極性切替手段９を構成するスイッチＳ、は第２図Ｅに示
すように積分器５Ａと５Ｂを構成するスイッチＳ、とＳ
、がオンの状態に戻され積分動作が終了したタイミング
で切替られる。The switch S constituting the polarity switching means 9 is connected to the switches S and S constituting the integrators 5A and 5B as shown in FIG. 2E.
, is returned to the on state and is switched at the timing when the integral operation is completed.
位相検波器４Ａと４Ｂに入力される信号ｖｌｌは第２図
Ｆに示すように極性切替手段９の切替によってＡ−ｓｉ
ｎ（ωｔ−＋θ）と−Ａ−ｓｉｎ（ωｔ、＋θ）に極性
が切替られる。The signal vll input to the phase detectors 4A and 4B is changed to A-si by switching the polarity switching means 9 as shown in FIG.
The polarity is switched to n(ωt-+θ) and -A-sin(ωt, +θ).
位相検波器４Ａと４Ｂの位相検波出力は極性切替器９の
切替動作に連動して正と負に反転し、この結集積分器５
Ａと５Ｂの積分電圧は第２図ＧとＨに示すように１動作
毎に極性が反転する。The phase detection outputs of the phase detectors 4A and 4B are reversed to positive and negative in conjunction with the switching operation of the polarity switch 9, and
The polarity of the integrated voltages A and 5B is reversed for each operation, as shown in FIG. 2, G and H.
スイッチＳ、により積分器５Ａと５Ｂに積分させた電圧
ＶＲ，とＶｌ、をＡＤ変換器６に取込みＡＤ変換し、そ
のＡＤ変換結果を演夏器７に送り込む。The voltages VR and Vl integrated by the integrators 5A and 5B by the switch S are taken into the AD converter 6 and subjected to AD conversion, and the result of the AD conversion is sent to the compensator 7.
演算器７では前回の測定値ＶＲ□、Ｖ１１と今回の測定
値ＶＲ，２，Ｖ １．ｚを平均化演算し真の実数部ベク
トル成分ＶＲ，と虚数部ベクトル成分Ｖ１、を算出する
。The calculator 7 calculates the previous measured value VR□, V11 and the current measured value VR,2, V1. z is averaged and the true real part vector component VR and imaginary part vector component V1 are calculated.
ＶＲ−＝ｙ２ＣＶＲ＊＋−ＶＲ−＊）
ｖ １．−’Ａ （Ｖ １．＋−ｖ ｒ、ｚ）（変形実
施例）
第３図にこの発明の変形実施例を示す。この例では極性
切替手段９として、位相検波器４Ａと４Ｂに与える基準
信号の極性を反転さセるように構成した場合を示す。VR-=y2CVR*+-VR-*) v 1. -'A (V 1.+-v r,z) (Modified Embodiment) FIG. 3 shows a modified embodiment of the present invention. In this example, a case is shown in which the polarity switching means 9 is configured to invert the polarity of the reference signal applied to the phase detectors 4A and 4B.
このように構成しても上述と同様に動作することは容易
に理解できよう。It is easy to understand that even with this configuration, the operation is similar to that described above.
尚、上述の実施例では極性切替手段９の切替周期を積分
器５Ａ、５Ｂの１積分周期毎として説明したが、必ずし
も１周期毎でなくてもよく、２〜３周期毎に切替えても
よい。In the above embodiment, the switching period of the polarity switching means 9 was explained as being every one integration period of the integrators 5A and 5B, but it does not necessarily have to be every one period, and may be changed every two to three periods. .
「発明の効果」
以上説明したように、この発明によれば積分器５Ａと５
Ｂの積分電圧の極性を１積分動作毎に切替るように構成
したがら、積分コンデンサｃ１と０２の積分電圧は直流
的に０レヘルとなる。"Effects of the Invention" As explained above, according to the present invention, the integrators 5A and 5
Since the polarity of the integrated voltage of B is configured to be switched for each integral operation, the integrated voltages of the integrating capacitors c1 and 02 become 0 leher in DC terms.
このために積分コンデンサｃｌとＣｔに誘電体吸収が起
きることを阻止され、誘電体９収による誤差が除去され
る。This prevents dielectric absorption from occurring in the integrating capacitors cl and Ct, and eliminates errors due to dielectric absorption.
また積分器５Ａと５Ｂを構成する演算増幅器の電流加箕
点に流れ込むリークｉｔ流によるリーク誤差及びクロス
トーク誤差は演算器７において平均化演算により打消さ
れ除去される。Further, leakage errors and crosstalk errors due to the leakage current flowing into the current addition point of the operational amplifiers constituting the integrators 5A and 5B are canceled out and removed by the averaging operation in the arithmetic unit 7.
従って、この発明によれば測定の安定度が向上し、精度
の高い交流ベクトル検波装置を提供することができる。Therefore, according to the present invention, it is possible to improve measurement stability and provide a highly accurate AC vector detection device.
第１図はこの発明の一実施例を示す接続図、第２図は第
１図の動作を説明するための波形図、第３図はこの発明
の変形実施例を示す接続図、第４図は従来の技術を説明
するための接続図である。
１：基準信号発生部、２：測定対象、３：バッファ増幅
器、４Ａ、４Ｂ：位相検波器、５Ａ、５Ｂ；積分器、６
：ＡＤ変換器、７：演算器、８：制御器、
９：極性切替手段。FIG. 1 is a connection diagram showing an embodiment of this invention, FIG. 2 is a waveform diagram for explaining the operation of FIG. 1, FIG. 3 is a connection diagram showing a modified embodiment of this invention, and FIG. 4 is a connection diagram for explaining a conventional technique. 1: Reference signal generator, 2: Measurement object, 3: Buffer amplifier, 4A, 4B: Phase detector, 5A, 5B; Integrator, 6
: AD converter, 7: Arithmetic unit, 8: Controller, 9: Polarity switching means.
Claims (1)
生部と、 Ｂ、被測定回路の応答出力信号を互に直交する位相差を
持つ基準信号で位相検波する二つの位相検波器と、 Ｃ、二つの位相検波器の検波出力を積分する二つの積分
器と、 Ｄ、この二つの積分器の積分電圧を除算し、該測定回路
のインピーダンスを算出する演算器と、 Ｅ、上記二つの位相検波器の出力信号の極性を上記積分
器の積分動作毎に反転させる極性切替手段と、 によって構成した交流ベクトル検波装置。(1) A: a reference signal generator that provides a sine wave signal to the circuit under test; and B: two phase detectors that detect the phase of the response output signal of the circuit under test using reference signals having mutually orthogonal phase differences. , C. Two integrators that integrate the detection outputs of the two phase detectors; D. An arithmetic unit that divides the integrated voltage of these two integrators and calculates the impedance of the measurement circuit; E. an AC vector detection device comprising: polarity switching means for inverting the polarity of the output signal of the two phase detectors for each integration operation of the integrator;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19463190A JPH0480667A (en) | 1990-07-23 | 1990-07-23 | Ac vector detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19463190A JPH0480667A (en) | 1990-07-23 | 1990-07-23 | Ac vector detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0480667A true JPH0480667A (en) | 1992-03-13 |
Family
ID=16327729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19463190A Pending JPH0480667A (en) | 1990-07-23 | 1990-07-23 | Ac vector detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0480667A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7260481B1 (en) | 2006-03-17 | 2007-08-21 | Tanita Corporation | Vector detecting device and living-body complex impedance measuring apparatus having the vector detecting device |
| JP2012032365A (en) * | 2010-01-26 | 2012-02-16 | Hioki Ee Corp | Measuring apparatus |
-
1990
- 1990-07-23 JP JP19463190A patent/JPH0480667A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7260481B1 (en) | 2006-03-17 | 2007-08-21 | Tanita Corporation | Vector detecting device and living-body complex impedance measuring apparatus having the vector detecting device |
| JP2007248446A (en) * | 2006-03-17 | 2007-09-27 | Tanita Corp | Vector detection device and living body complex impedance measuring device having same |
| JP2012032365A (en) * | 2010-01-26 | 2012-02-16 | Hioki Ee Corp | Measuring apparatus |
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