JPS6117072A - Resistance variation detecting circuit - Google Patents
Resistance variation detecting circuitInfo
- Publication number
- JPS6117072A JPS6117072A JP59135126A JP13512684A JPS6117072A JP S6117072 A JPS6117072 A JP S6117072A JP 59135126 A JP59135126 A JP 59135126A JP 13512684 A JP13512684 A JP 13512684A JP S6117072 A JPS6117072 A JP S6117072A
- Authority
- JP
- Japan
- Prior art keywords
- resistance
- circuit
- variable resistance
- current
- detecting 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 235000008375 Decussocarpus nagi Nutrition 0.000 description 1
- 244000309456 Decussocarpus nagi Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、抵抗変化素子に電流を供給すると同時に該抵
抗変化素子から発生される信号を増幅する回路に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a circuit that supplies current to a variable resistance element and simultaneously amplifies a signal generated from the variable resistance element.
外部要因により稙抗値を変化する素子としては、皿素子
（磁気抵抗効果型素子）、光電素子感圧素子等がある。Examples of elements that change the resistance value due to external factors include dish elements (magnetoresistive elements), photoelectric elements, pressure-sensitive elements, and the like.
これらのうち、■素子は、例えば米国特許第４０４０１
１３号公報に記載されているよう、に、外部磁界により
比抵抗が変化する素子であって、磁気テープ装置等の読
取用ヘッドとして用いられている。Among these, element (1) is, for example, US Pat. No. 40401
As described in Japanese Patent No. 13, it is an element whose resistivity changes depending on an external magnetic field, and is used as a reading head of a magnetic tape device or the like.
■素子の抵抗変化検出回路としては、例えば第４図に示
すような回路が用いられている。第４図に−おいては、
■素子１に直列に接続された電流源２１によって該■素
子１に電流を供給する。(2) As an element resistance change detection circuit, for example, a circuit as shown in FIG. 4 is used. In Figure 4,
(2) Current is supplied to the element 1 by a current source 21 connected in series to the element 1.
■素子１の出力信号は結合コンデンサ２２にて交流結合
された増幅器２３にて増幅される。(2) The output signal of the element 1 is amplified by an amplifier 23 which is AC-coupled by a coupling capacitor 22.
従来の抵抗変化検出回路の欠点は、凪素子の出力信号の
オフセット電圧を抑制するために、結合コンデンサを用
いて交流結合する必要があり、回路構成を複雑化し、ま
たＬＳｉ化に適さないということである。The disadvantage of conventional resistance change detection circuits is that in order to suppress the offset voltage of the output signal of the Nagi element, it is necessary to perform AC coupling using a coupling capacitor, which complicates the circuit configuration and makes it unsuitable for LSi implementation. It is.
本発明の目的は、抵抗変化素子に電流を供給する部位と
、該抵抗変化素子の出力信号を増幅する部位とを直流結
合できる抵抗変化検出回路を提供することにある。An object of the present invention is to provide a resistance change detection circuit capable of DC coupling a portion that supplies current to a resistance change element and a portion that amplifies an output signal of the resistance change element.
本発明の特徴は、抵抗変化素子をベース接地トランジス
タのエミッタ端子に接続していることにある。そのため
、ベース接地トランジスタと抵抗変化素子にて、抵抗変
化素子への電流源を構成すると同時に、抵抗変化素子の
抵抗変化に伴なう電流変化の増幅器を構成することがで
きる。そのため、抵抗変化素子に電流を供給する部位と
、該抵抗変化素子の出力信号を増幅する部位とを一コン
デンサ等にて結合する必要がない。A feature of the present invention is that the variable resistance element is connected to the emitter terminal of the common base transistor. Therefore, the common base transistor and the variable resistance element can constitute a current source for the variable resistance element, and at the same time constitute an amplifier for changing current according to a change in resistance of the variable resistance element. Therefore, there is no need to connect the portion that supplies current to the variable resistance element and the portion that amplifies the output signal of the variable resistance element using a single capacitor or the like.
以下、本発明の実施例を第１図ないし第３図により説明
する。Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.
第１図は本発明の基本構成図である。第１図において１
は皿素子、２は負荷抵抗、４はベース接地トランジスタ
である。ベース接地トランジスタ４０ペースには基準電
圧Ｖｒｅｆを与える。FIG. 1 is a basic configuration diagram of the present invention. In Figure 1, 1
is a dish element, 2 is a load resistor, and 4 is a common base transistor. A reference voltage Vref is applied to the common base transistor 40.
■素子１には両端の電位差に応じた（（７７ｇ７−Ｖａ
Ｅ）−ＶＥＥ ）／ＲＭＲなる電流ＩＭＲ０が供給され
る。ここでｖＢＥハヘース［地）ランラスタ４０ペース
・エミッタ間電圧降下、ＶＥＲは皿素子の一端の電位、
ＲＭＲは皿素子の直流抵抗である。゛ここで、外部磁界
により■素子１の抵抗値がＲＭＲ＋ ｒＭＲに変化する
と、■素子１に流れる電流の変化ｉＭＲはとなり、出力
Ｅ。は
となる。■For element 1, the voltage was set according to the potential difference between both ends ((77g7-Va
A current IMR0 of E)-VEE)/RMR is supplied. Here, vBE is the voltage drop between the emitter and the run raster 40, and VER is the potential at one end of the plate element.
RMR is the direct current resistance of the dish element.゛Here, when the external magnetic field changes the resistance value of element 1 to RMR+rMR, the change in current flowing through element 1 iMR becomes, and the output becomes E. Hato becomes.
ＩＭＲｏの増幅器を構成している。It constitutes the IMRo amplifier.
第２図は本発明の別の実施例である。第２図では皿素子
１は中点を持った３端子型であり、中点を定電位ＶＥＲ
に接続し、他端を一対のベース接地トランジスタ４，５
のエミッタ端子に接続しである。負荷抵抗２とベース接
地トランジスタ４と皿素子１１の組と、負荷抵抗３とベ
ース接地トランジスタ５と皿素子１２０組は第１図で説
明したように増幅器を構成しており、その出力を更に後
段増幅器７にて増幅する。その際、■素子１１と１２の
抵抗値の差による後段増幅器８の入力Ｖ、 、 Ｖ、の
直流的な電位差の発生を抑えるためにフィードバック回
路６によってベース接地トランジスタ５０ペース電位を
制御する。FIG. 2 shows another embodiment of the invention. In Fig. 2, the dish element 1 is a three-terminal type with a midpoint, and the midpoint is a constant potential VER.
and the other end is connected to a pair of base-grounded transistors 4 and 5.
It is connected to the emitter terminal of. The set of load resistor 2, common base transistor 4, and dish element 11, and the set of load resistor 3, common base transistor 5, and dish element 120 constitute an amplifier as explained in FIG. Amplifier 7 amplifies the signal. At this time, the feedback circuit 6 controls the base potential of the common base transistor 50 in order to suppress the occurrence of a DC potential difference between the inputs V, , V, of the rear stage amplifier 8 due to the difference in the resistance values of the elements 11 and 12.
本実施例によれば、後段増幅器８の入力の直流電位差を
零にできるので、後段増幅器８の入力 １をコンデン
サ結合する必要がなく、■素子の電流供給源から増幅器
までをすべてＬＳｉ化することができる。According to this embodiment, since the DC potential difference between the inputs of the rear-stage amplifier 8 can be made zero, there is no need to connect the input 1 of the rear-stage amplifier 8 with a capacitor. I can do it.
第３図は本発明の別の実施例である。第３図の回路は■
素子１に供給する直流電流が常に−・定になるように制
御しつつ、皿素子１の抵抗変化を検出する回路である。FIG. 3 shows another embodiment of the invention. The circuit in Figure 3 is ■
This circuit detects a change in resistance of the plate element 1 while controlling the DC current supplied to the element 1 to always be constant.
第３図が第２図に示した実施例と異なる点は、■素子１
に流れる電流値を反映する負荷抵抗２．３による電圧降
下が一定となるように、ベース接地トランジスタ４゜５
のベース電位を制御する点である。すなわち、後段増幅
器８の直流入力電位Ｖ、 、 Ｖ、が基準電位’１ｒｅ
ｆと等しくなるようにフィードバック回路６゜７にてベ
ース接地トランジスタ４，５のベース電位を設定する。The difference between the embodiment shown in FIG. 3 and the embodiment shown in FIG. 2 is:
In order to keep the voltage drop due to the load resistor 2.3, which reflects the current value flowing through the
The point is to control the base potential of . That is, the DC input potential V, , V, of the rear stage amplifier 8 is the reference potential '1re.
The base potential of the common base transistors 4 and 5 is set by the feedback circuit 6.7 so as to be equal to f.
本実施例によれば、後段増幅器８０入力直流電位は常に
一定に保たれ、回路が飽和することはない。また、■素
子１が摩耗等により直流抵抗が変化しても、該■素子１
に供給する電流を一定に保つことができる。According to this embodiment, the DC potential input to the rear stage amplifier 80 is always kept constant, and the circuit is never saturated. In addition, even if the DC resistance of ■Element 1 changes due to wear etc., the ■Element 1
The current supplied to the circuit can be kept constant.
以上説明したように、本発明によれば、抵抗変化素子へ
の電流供給と、該抵抗変化素子の出力信号の増幅とを同
時にできるので、回路のＬＳｉ化が可能である。As described above, according to the present invention, it is possible to simultaneously supply current to the variable resistance element and amplify the output signal of the variable resistance element, and thus it is possible to implement the circuit into an LSi.
第１図は本発明の基本的な実施例を示す回路図、第２，
３図は本発明の別の実施例を示す回路図、第４図は従来
の抵抗変化検出回路の回路図である。
１・・・皿素子、 ２．３・・・負荷抵抗、
４．５・・・ベース接地トランジスタ、６．７・・・フ
ィードバック回路、８・・・後段増幅器。
第 １ 図
ｖＥＥ
第 ２ 図
ｒ−ｒ
ｔｔ−
第 ３ 図
Ｖｅｒ。
第本図Fig. 1 is a circuit diagram showing a basic embodiment of the present invention;
FIG. 3 is a circuit diagram showing another embodiment of the present invention, and FIG. 4 is a circuit diagram of a conventional resistance change detection circuit. 1... Disk element, 2.3... Load resistance,
4.5... Common base transistor, 6.7... Feedback circuit, 8... Post-stage amplifier. Figure 1 vEE Figure 2 r-r tt- Figure 3 Ver. Main figure
Claims (1)
化分を検出する回路において、一端を定電圧源に接続し
た上記抵抗変化素子の他端にエミッタ端子を接続し、コ
レクタ端子に負荷抵抗を接続したベース接地トランジス
タを有することを特徴とする抵抗変化検出回路。In a circuit that detects the resistance change of a variable resistance element whose resistance value changes due to external factors, one end is connected to a constant voltage source, the emitter terminal is connected to the other end of the variable resistance element, and a load resistor is connected to the collector terminal. A resistance change detection circuit characterized by having a common base transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59135126A JPS6117072A (en) | 1984-07-02 | 1984-07-02 | Resistance variation detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59135126A JPS6117072A (en) | 1984-07-02 | 1984-07-02 | Resistance variation detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6117072A true JPS6117072A (en) | 1986-01-25 |
Family
ID=15144424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59135126A Pending JPS6117072A (en) | 1984-07-02 | 1984-07-02 | Resistance variation detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6117072A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799005A (en) * | 1983-04-13 | 1989-01-17 | Fernandes Roosevelt A | Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
| JPH0581758U (en) * | 1992-04-09 | 1993-11-05 | 株式会社村田製作所 | Magnetic sensor device |
| US5416645A (en) * | 1992-10-27 | 1995-05-16 | Sony Corporation | Reproducing circuit having common base amplifier, low-pass filter and peak detector for use with magnetoresistive head |
| RU2619828C1 (en) * | 2015-12-24 | 2017-05-18 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Сибирский государственный университет путей сообщения" (СГУПС) | High-speed converter of changing sensor resistance into electrical signal |
-
1984
- 1984-07-02 JP JP59135126A patent/JPS6117072A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799005A (en) * | 1983-04-13 | 1989-01-17 | Fernandes Roosevelt A | Electrical power line parameter measurement apparatus and systems, including compact, line-mounted modules |
| JPH0581758U (en) * | 1992-04-09 | 1993-11-05 | 株式会社村田製作所 | Magnetic sensor device |
| US5416645A (en) * | 1992-10-27 | 1995-05-16 | Sony Corporation | Reproducing circuit having common base amplifier, low-pass filter and peak detector for use with magnetoresistive head |
| RU2619828C1 (en) * | 2015-12-24 | 2017-05-18 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Сибирский государственный университет путей сообщения" (СГУПС) | High-speed converter of changing sensor resistance into electrical signal |
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