JPH0238920A - Temperature compensated type amplifying circuit - Google Patents
Temperature compensated type amplifying circuitInfo
- Publication number
- JPH0238920A JPH0238920A JP63188309A JP18830988A JPH0238920A JP H0238920 A JPH0238920 A JP H0238920A JP 63188309 A JP63188309 A JP 63188309A JP 18830988 A JP18830988 A JP 18830988A JP H0238920 A JPH0238920 A JP H0238920A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- temperature characteristic
- signal
- amplification factor
- resistance
- 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
- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
ｒ産業上の利用分野〕
本発明は、温度特性を有する信号源からの信号を増幅す
る増幅回路に係わり、特に信号源の温度特性を補正でき
る温度補正形増幅回路に関する。DETAILED DESCRIPTION OF THE INVENTION r Industrial Application Field The present invention relates to an amplifier circuit that amplifies a signal from a signal source having temperature characteristics, and particularly relates to a temperature-compensated amplifier circuit that can correct the temperature characteristics of the signal source. .
従来の磁気検出装置は、磁気センサ部により磁気１を検
出し、増幅器により一定の増幅率をもって磁気センサ部
の出力信号を増幅し、外部装置に出力するものであった
。A conventional magnetic detection device detects magnetism 1 with a magnetic sensor section, amplifies the output signal of the magnetic sensor section with a constant amplification factor using an amplifier, and outputs the signal to an external device.
一般に磁気センサ部にて用いられる磁気抵抗素子には、
負の温度特性を有するものがある。Magnetoresistive elements generally used in magnetic sensors include:
Some have negative temperature characteristics.
この場合、前記の磁気検出装置では、磁気センサ部の出
力信号が負の温度特性を有することになり、その出力信
号をそのまま増幅して外部装置に出力するため、検出信
頼性が著しく阻害されていた。In this case, in the magnetic detection device described above, the output signal of the magnetic sensor section will have negative temperature characteristics, and the output signal will be amplified as it is and output to the external device, so detection reliability will be significantly impaired. Ta.
本発明は、このような問題点に鑑み、温度特性を有する
信号源からの信号を増幅する増幅回路において、信号源
の温度特性を補正できるものを提供することを目的とす
る。SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide an amplifier circuit that amplifies a signal from a signal source having temperature characteristics, which can correct the temperature characteristics of the signal source.
本発明は、この目的を達成するために、温度特性を有す
る信号源からの信号が入力される増幅器と、この増幅器
の増幅率を決定する抵抗回路と、この抵抗回路に接続さ
れ、その増幅率を前記信号源と逆の温度特性に補正する
温度特性抵抗体とを具備する温度補正形増幅回路を提供
するものである。ここに「温度特性を有する」とは、温
度変化に従って信号レベルや増幅率、抵抗値などが変動
する性質をいう。また「温度特性抵抗体」は、必ずしも
それ自体が信号源の温度特性と逆の温度特性であること
を要せず、抵抗回路に接続された結果、増幅率を信号源
の温度特性と逆の温度特性に補正できる特性であればよ
い。In order to achieve this object, the present invention provides an amplifier into which a signal from a signal source having temperature characteristics is input, a resistor circuit that determines the amplification factor of this amplifier, and a resistor circuit connected to the resistor circuit that determines the amplification factor of the amplifier. The present invention provides a temperature-corrected amplifier circuit comprising a temperature-dependent resistor that corrects the temperature characteristic of the signal source to have a temperature characteristic opposite to that of the signal source. Here, "having temperature characteristics" refers to the property that the signal level, amplification factor, resistance value, etc. fluctuate according to temperature changes. In addition, a "temperature-dependent resistor" does not necessarily have a temperature characteristic that is opposite to that of the signal source, but as a result of being connected to a resistor circuit, the amplification factor can be changed to a temperature characteristic that is opposite to that of the signal source. Any characteristic that can be corrected to temperature characteristics may be used.
本発明によれば、温度特性抵抗体により、増幅器の増幅
率は、信号源からの信号が有する温度特性と逆の特性と
なる。従って、この増幅率をもって信号源からの信号を
増幅することにより、その信号が存する温度特性が打ち
消されて補正されることになる。According to the present invention, the temperature characteristic resistor causes the amplification factor of the amplifier to have a temperature characteristic opposite to that of the signal from the signal source. Therefore, by amplifying the signal from the signal source with this amplification factor, the temperature characteristics of the signal are canceled out and corrected.
以下図面に基づいて、本発明の詳細な説明する。 The present invention will be described in detail below based on the drawings.
第１図は、本発明の一実施例に係る磁気検出装置を示す
。磁気センサ部ｌは、磁気抵抗素子により被検出物の磁
気量を検出するものであり、抵抗２．３からなる等価回
路で表される。この磁気センサ部１の出力信号４は、抵
抗５を介して増幅器６の−（マイナス）入力端子に入力
される。この増幅器６の＋（プラス）入力端子は接地さ
れている。また増幅器６の出力信号７は、外部出力端子
８に出力されると共に、抵抗９．１Ｏ１１１からなる抵
抗回路１２を介し一入力端子に帰還している。抵抗９は
帰還抵抗、抵抗ｌＯは正特性サーミスタなどの正の温度
特性を有する抵抗、抵抗１１は特性調整用の抵抗である
。FIG. 1 shows a magnetic detection device according to an embodiment of the present invention. The magnetic sensor section 1 detects the amount of magnetism of an object to be detected using a magnetoresistive element, and is represented by an equivalent circuit consisting of a resistor 2.3. The output signal 4 of the magnetic sensor section 1 is inputted to a - (minus) input terminal of an amplifier 6 via a resistor 5. The + (plus) input terminal of this amplifier 6 is grounded. Further, the output signal 7 of the amplifier 6 is outputted to an external output terminal 8, and is also fed back to one input terminal via a resistance circuit 12 consisting of a resistor 9.1O111. The resistor 9 is a feedback resistor, the resistor lO is a resistor having positive temperature characteristics such as a positive temperature coefficient thermistor, and the resistor 11 is a resistor for adjusting characteristics.
ここで磁気抵抗素子（抵抗２．３）は負の温度特性を有
する素子であり、磁気センサ部１の出力信号４は負の温
度特性を有する信号となる。一方、増幅器６の増幅率は
抵抗回路１２の合成抵抗値に比例するので、正の温度特
性を有するものとなる。Here, the magnetoresistive element (resistance 2.3) is an element having negative temperature characteristics, and the output signal 4 of the magnetic sensor section 1 is a signal having negative temperature characteristics. On the other hand, since the amplification factor of the amplifier 6 is proportional to the combined resistance value of the resistance circuit 12, it has positive temperature characteristics.
従って、磁気センサ部１の出力信号４が有していた負の
温度特性を、増幅率の正の温度特性により相殺すること
により補正することができる。つまり増幅器６の出力信
号７について、磁気抵抗素子の温度による影響を低減す
ることができる。これにより信頼性の高い磁気検出が可
能となる。Therefore, the negative temperature characteristic of the output signal 4 of the magnetic sensor section 1 can be corrected by offsetting it with the positive temperature characteristic of the amplification factor. In other words, the influence of the temperature of the magnetoresistive element on the output signal 7 of the amplifier 6 can be reduced. This enables highly reliable magnetic detection.
本実施例では、反転増幅器において、帰還抵抗値を正の
温度特性に補正することにより、増幅率を補正する態様
を示したが、本発明は反転増幅器への適用に限定されな
い。また帰還抵抗値を補正する態様に限定されず、増幅
率を決定する他の抵抗値を補正する態様により同様の効
果を期待できる。In this embodiment, an embodiment has been shown in which the amplification factor is corrected by correcting the feedback resistance value to have a positive temperature characteristic in an inverting amplifier, but the present invention is not limited to application to an inverting amplifier. Further, the present invention is not limited to the mode of correcting the feedback resistance value, but similar effects can be expected by a mode of correcting other resistance values that determine the amplification factor.
さらに本実施例では、磁気検出装置について本発明を適
用した例を示したが、本発明は、各種センサの出力信号
、その他の温度特性を有する人力信号を増幅する増幅回
路一般に適用して同様の効果を期待できる。Furthermore, although this embodiment shows an example in which the present invention is applied to a magnetic detection device, the present invention can also be applied to general amplifier circuits that amplify output signals of various sensors and other human input signals having temperature characteristics. You can expect good results.
以上説明したように、本発明によれば、温度特性抵抗体
にて増幅器の増幅率を信号源の温度特性と逆の特性とす
ることによって、信号源の温度特性を打ち消して増幅す
ることができる。As explained above, according to the present invention, by setting the amplification factor of the amplifier to have a characteristic opposite to the temperature characteristic of the signal source using a temperature characteristic resistor, it is possible to cancel the temperature characteristic of the signal source and amplify it. .
第１図は本発明の一実施例に係る磁気検出装置を示す構
成図である。
１・・・・・・磁気センサ部、２．３・・・・・・抵抗
、４・・・・・・磁気センサ部の出力信号、５・・・・
・・抵抗、６・・・・・・増幅器、７・・・・・・出力
信号、８・・・・・・外部出力端子、
９．１Ｏ１１１・・・・・・抵抗、１２・・・・・・抵
抗回路。
出 願 人 日本電気株式会社
代 理 人 弁理士 山内梅、雄FIG. 1 is a configuration diagram showing a magnetic detection device according to an embodiment of the present invention. 1... Magnetic sensor section, 2.3... Resistance, 4... Output signal of magnetic sensor section, 5...
...Resistance, 6...Amplifier, 7...Output signal, 8...External output terminal, 9.1O111...Resistance, 12... ...Resistance circuit. Applicant: NEC Corporation Representative: Patent attorney: Ume, Yu Yamauchi
Claims (1)
と、 この増幅器の増幅率を決定する抵抗回路と、この抵抗回
路に接続され、その増幅率を前記信号源と逆の温度特性
に補正する温度特性抵抗体とを具備することを特徴とす
る温度補正形増幅回路。[Claims] An amplifier into which a signal from a signal source having temperature characteristics is input; a resistor circuit that determines the amplification factor of the amplifier; and a resistor circuit connected to the resistor circuit whose amplification factor is opposite to that of the signal source. 1. A temperature compensation type amplifier circuit, comprising: a temperature characteristic resistor that compensates for the temperature characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63188309A JPH0238920A (en) | 1988-07-29 | 1988-07-29 | Temperature compensated type amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63188309A JPH0238920A (en) | 1988-07-29 | 1988-07-29 | Temperature compensated type amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0238920A true JPH0238920A (en) | 1990-02-08 |
Family
ID=16221352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63188309A Pending JPH0238920A (en) | 1988-07-29 | 1988-07-29 | Temperature compensated type amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0238920A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6252395B1 (en) | 1998-02-04 | 2001-06-26 | Denso Corporation | Temperature-compensating amplification circuit and a position detecting apparatus using such amplification circuit |
| US6448768B1 (en) | 1997-02-28 | 2002-09-10 | Asahi Kasei Electronics Co., Ltd. | Magnetic sensor with a signal processing circuit |
| JP2004347368A (en) * | 2003-05-20 | 2004-12-09 | Mitsubishi Electric Corp | Radiation monitor |
| JP2008082866A (en) * | 2006-09-27 | 2008-04-10 | Citizen Holdings Co Ltd | Physical quantity sensor |
| JP2008256433A (en) * | 2007-04-03 | 2008-10-23 | Akoo:Kk | Microphone unit, noise meter, and acoustic calibration device |
-
1988
- 1988-07-29 JP JP63188309A patent/JPH0238920A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6448768B1 (en) | 1997-02-28 | 2002-09-10 | Asahi Kasei Electronics Co., Ltd. | Magnetic sensor with a signal processing circuit |
| US6252395B1 (en) | 1998-02-04 | 2001-06-26 | Denso Corporation | Temperature-compensating amplification circuit and a position detecting apparatus using such amplification circuit |
| JP2004347368A (en) * | 2003-05-20 | 2004-12-09 | Mitsubishi Electric Corp | Radiation monitor |
| JP4540301B2 (en) * | 2003-05-20 | 2010-09-08 | 三菱電機株式会社 | Radiation monitor |
| JP2008082866A (en) * | 2006-09-27 | 2008-04-10 | Citizen Holdings Co Ltd | Physical quantity sensor |
| JP2008256433A (en) * | 2007-04-03 | 2008-10-23 | Akoo:Kk | Microphone unit, noise meter, and acoustic calibration device |
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