JPH0422565Y2 - - Google Patents
Info
- Publication number
- JPH0422565Y2 JPH0422565Y2 JP2103684U JP2103684U JPH0422565Y2 JP H0422565 Y2 JPH0422565 Y2 JP H0422565Y2 JP 2103684 U JP2103684 U JP 2103684U JP 2103684 U JP2103684 U JP 2103684U JP H0422565 Y2 JPH0422565 Y2 JP H0422565Y2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- inverting amplifier
- amplifier
- inverting
- voltage
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
【考案の詳細な説明】
本考案は信号源の温度特性を補償する温度係数
可変の増幅装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplifier device with a variable temperature coefficient that compensates for the temperature characteristics of a signal source.
信号源、たとえばタイヤのゴム厚さの検出に使
用するイオンチヤンバー等は温度特性を有し、正
確な測定を行なうためには温度特性を補償する必
要がある。 A signal source, such as an ion chamber used to detect the rubber thickness of a tire, has a temperature characteristic, and it is necessary to compensate for the temperature characteristic in order to make accurate measurements.
本考案は上記にかんがみなされたもので、反転
増幅器を用いてそれぞれ正、負の温度係数を持た
せ、前記反転増幅器の出力を合成することによつ
て、信号源の温度特性を補償する増幅装置を提供
することを目的とする。 The present invention has been developed in view of the above, and is an amplifier device that uses inverting amplifiers to have positive and negative temperature coefficients, respectively, and compensates for the temperature characteristics of a signal source by combining the outputs of the inverting amplifiers. The purpose is to provide
以下、本考案を実施例により説明する。 The present invention will be explained below with reference to examples.
第１図は本考案の一実施例の構成を示すブロツ
ク図である。 FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
第１図において、１はたとえばイオンチヤンバ
ー等の信号源である。信号源１は電圧源であると
し、その出力電圧はVOはVO＝Ｖ（１＋αT）で示
される。ここでＶは基準温度（25℃）における信
号源１の出力電圧、αは温度係数、Ｔは基準温度
からの温度である。 In FIG. 1, 1 is a signal source such as an ion chamber. It is assumed that the signal source 1 is a voltage source, and its output voltage V O is expressed as V O =V (1+αT). Here, V is the output voltage of the signal source 1 at the reference temperature (25° C.), α is the temperature coefficient, and T is the temperature from the reference temperature.
本考案の一実施例は、信号源１の出力をバツフ
ア増幅器２を介して可変抵抗器３の摺動片に供給
してある。可変抵抗器３の抵抗体の一端の電圧は
反転増幅器４に、可変抵抗器３の抵抗体の他端の
電圧は反転増幅器５に供給してある。反転増幅器
４の出力と反転増幅器５の出力とは可変抵抗器か
らなるポテンシヨメータ６に供給して反転増幅器
４の出力と反転増幅器５の出力との電位差を分圧
して反転増幅器からなるバツフア増幅器７を介し
て出力してある。 In one embodiment of the present invention, the output of a signal source 1 is supplied to a sliding piece of a variable resistor 3 via a buffer amplifier 2. The voltage at one end of the resistor of the variable resistor 3 is supplied to an inverting amplifier 4, and the voltage at the other end of the resistor of the variable resistor 3 is supplied to an inverting amplifier 5. The output of the inverting amplifier 4 and the output of the inverting amplifier 5 are supplied to a potentiometer 6 consisting of a variable resistor, and the potential difference between the output of the inverting amplifier 4 and the output of the inverting amplifier 5 is divided to form a buffer amplifier consisting of an inverting amplifier. It is output via 7.
反転増幅器４は演算増幅器４１、演算増幅器４
１の反転入力端と可変抵抗器３の抵抗体の一端と
の間に接続された抵抗４２、演算増幅器４１の非
反転入力端とアースとの間に接続された抵抗４
３、帰還抵抗４４とからなり、抵抗４２は温度係
数βの抵抗体たとえば白金線から構成してある。 The inverting amplifier 4 is an operational amplifier 41, an operational amplifier 4
A resistor 42 is connected between the inverting input terminal of the operational amplifier 41 and one end of the resistor of the variable resistor 3, and a resistor 4 is connected between the non-inverting input terminal of the operational amplifier 41 and ground.
3 and a feedback resistor 44, and the resistor 42 is composed of a resistor having a temperature coefficient β, for example, a platinum wire.
反転増幅器５は演算増幅器５１、演算増幅器５
１の反転入力端と可変抵抗器３の抵抗体の他端と
の間に接続された抵抗５２、演算増幅器５１の非
反転入力端とアースとの間に接続された抵抗５
３、帰還抵抗５４とからなり、帰還抵抗５４は温
度係数βの抵抗体たとえば抵抗４２と同様に白金
線から構成してある。 The inverting amplifier 5 is an operational amplifier 51, an operational amplifier 5
A resistor 52 is connected between the inverting input terminal of the operational amplifier 51 and the other end of the resistor of the variable resistor 3, and a resistor 5 is connected between the non-inverting input terminal of the operational amplifier 51 and ground.
3. The feedback resistor 54 is made of a resistor having a temperature coefficient β, for example, a platinum wire like the resistor 42.
バツフア増幅器７は、反転増幅器７１、抵抗７
２および７３、帰還抵抗７４からなつている。 The buffer amplifier 7 includes an inverting amplifier 71 and a resistor 7.
2 and 73, and a feedback resistor 74.
以上の如く構成された本考案の一実施例におい
て、信号源１の出力電圧はバツフア増幅器２を介
して可変抵抗器３の摺動片に印加される。 In one embodiment of the present invention constructed as described above, the output voltage of the signal source 1 is applied to the sliding piece of the variable resistor 3 via the buffer amplifier 2.
ここで可変抵抗器３の摺動片は反転増幅器４の
出力と反転増幅器５の出力が等しくなるように設
定してある。 Here, the sliding piece of the variable resistor 3 is set so that the output of the inverting amplifier 4 and the output of the inverting amplifier 5 are equal.
バツフア増幅器２を介して可変抵抗器３の摺動
片に供給された電圧は反転増幅器４および５で反
転増幅される。しかるに反転増幅器４の抵抗４２
の抵抗値R42はR42＝RO（１＋βT）、反転増幅器５
の帰還抵抗５４の抵抗値R54はR54＝RO（１＋βT）
である。ROは基準温度における抵抗値である。 The voltage supplied to the sliding piece of variable resistor 3 via buffer amplifier 2 is inverted and amplified by inverting amplifiers 4 and 5. However, the resistor 42 of the inverting amplifier 4
The resistance value R 42 is R 42 = R O (1 + βT), inverting amplifier 5
The resistance value R 54 of the feedback resistor 54 is R 54 = R O (1+βT)
It is. R O is the resistance value at the reference temperature.
反転増幅器４の帰還抵抗４４の抵抗値をR44、
反転増幅器５の抵抗５２の抵抗値をR52とすれ
ば、増幅器４の利得A4および反転増幅器５の利
得A5は
A4＝VA／VO＝（−）R44／R42＝（−）R44／RO（１＋
βT）
≒（−）R44／RO（１＋βT）
A5＝VA／VO
＝（−）R44／R52＝（−）RO／R52（１＋βT）
となる。V4，V5は反転増幅器４，５の出力電圧
である。また可変抵抗器３の抵抗体の抵抗値は無
視して示してある。 The resistance value of the feedback resistor 44 of the inverting amplifier 4 is R 44 ,
If the resistance value of the resistor 52 of the inverting amplifier 5 is R52 , the gain A4 of the amplifier 4 and the gain A5 of the inverting amplifier 5 are A4 = V A /V O = (-) R44 / R42 = ( −) R 44 /R O (1+
βT) ≒(−)R 44 /R O (1+βT) A 5 =V A /V O =(−)R 44 /R 52 =(−)R O /R 52 (1+βT). V 4 and V 5 are the output voltages of the inverting amplifiers 4 and 5. Further, the resistance value of the resistor of the variable resistor 3 is ignored.
そこで反転増幅器４の利得A4の温度係数は
（−）となり、反転増幅器５の利得A5の温度係数
は（＋）であり、温度に対する出力電圧V4，V5
は第２図に示す如くになる。 Therefore, the temperature coefficient of the gain A 4 of the inverting amplifier 4 is (-), the temperature coefficient of the gain A 5 of the inverting amplifier 5 is (+), and the output voltages V 4 , V 5 with respect to temperature
is as shown in FIG.
反転増幅器４および５の出力間の電位差はポテ
ンシヨメータ６で分圧される。ポテンシヨメータ
６は第２図において１点破線で示す如く温度軸と
平行となるように前記電位差を分圧する。ポテン
シヨメータ６の分圧比を（１−ｋ）：ｋとする。
ｋは０ｋ１である。 The potential difference between the outputs of the inverting amplifiers 4 and 5 is divided by a potentiometer 6. The potentiometer 6 divides the potential difference so as to be parallel to the temperature axis, as shown by the dotted line in FIG. Let the partial pressure ratio of the potentiometer 6 be (1-k):k.
k is 0k1.
電圧VA，VBはVA＝G1VO，VB＝G2VO，G1＝
（−）R44（１−βT）／RO，G2＝（−）RO（１＋
βT）／R52とすれば、ポテンシヨメータ６の出力
電圧VCは
VC＝（G1−G2）VO・ｋ＋G2VO
＝〔G1ｋ＋（１−ｋ）G2〕VO
＝〔G1ｋ＋（１−ｋ）G2〕（１＋αT）Ｖ
となる。 The voltages V A and V B are V A = G 1 V O , V B = G 2 V O , G 1 =
(-) R 44 (1-βT)/R O , G 2 = (-) R O (1+
βT)/R 52 , the output voltage V C of the potentiometer 6 is V C = (G 1 - G 2 ) V O · k + G 2 V O = [G 1 k + (1 - k) G 2 ] V O =[G 1 k+(1-k)G 2 ](1+αT)V.
ここで、R44／RO＝RO／R52と設定できこれを
GOとする。 Here, we can set R 44 /R O = R O /R 52 , which is
G O.
VC＝〔GO（１−βT）ｋ＋（１−ｋ）GO（１＋
βT）〕（１＋αT）Ｖ
＝（kGO−kβTGO＋（１−ｋ）GO＋（１−ｋ）
GOβT）（１＋αT）Ｖ
＝〔GO＋（１−2k）GOβT〕（１＋αT）Ｖ＝
〔GO＋GOＴ｛（１−2k）β＋α｝＋（１−2k）αβG0
T2〕Ｖ
＝GOＶ＋GO＋｛（１−2k）β＋α｝Ｖ＋（１−
2k）αβGOT2Ｖ
（１−2k）β＋α＝０とすると
ｋ＝α＋β／2β
したがつて
VC＝GOＶ＋（１−α＋β／β）αβGOT2Ｖ
＝GOＶ＋（β−α−β）αGOT2Ｖ
＝GOＶ−α2GOT2Ｖとなる。 V C = [G O (1-βT)k+(1-k)G O (1+
βT)] (1+αT)V = (kG O −kβT G O + (1-k) G O + (1-k)
G O βT) (1 + αT) V = [G O + (1-2k) G O βT] (1 + αT) V =
[G O +G O T {(1-2k)β+α}+(1-2k)αβG 0
T 2 ]V = G O V + G O + {(1-2k)β+α}V+(1-
2k) αβG O T 2 V (1-2k) If β+α=0, then k=α+β/2β Therefore, V C =G O V+(1-α+β/β)αβG O T 2 V =G O V+(β- α−β) αG O T 2 V = G O V−α 2 G O T 2 V.
以上からｋを選択することにより
VC＝GOＶ−α2GOT2Ｖが得られ、α2が小さけれ
ばVC＝GOＶとなつて温度に依存しなくなる。 By selecting k from the above, V C =G O V - α 2 G O T 2 V is obtained, and if α 2 is small, V C =G O V, which becomes independent of temperature.
また、電圧VCは反転増幅器７で増幅されるた
め反転増幅器７の利得を“−１”とすれば信号源
１の電圧変化は同一極性の変化として温度依存性
がなく反転増幅器７から得られることになる。 In addition, since the voltage V C is amplified by the inverting amplifier 7, if the gain of the inverting amplifier 7 is set to "-1", the voltage change of the signal source 1 can be obtained from the inverting amplifier 7 as a change of the same polarity without temperature dependence. It turns out.
また、信号源１の電圧を電圧／周波数変換して
出力する場合も、電圧／周波数変換器の温度特性
も同様な方法で補償することができる。 Further, when the voltage of the signal source 1 is converted into voltage/frequency and outputted, the temperature characteristics of the voltage/frequency converter can also be compensated in a similar manner.
以上説明した如く本考案によれば同一の信号源
の電圧を増幅する第１および第２の反転増幅器を
有し、第１の反転増幅器の入力測抵抗に温度係数
を有する抵抗を使用しかつ第２の反転増幅器の帰
還抵抗に前記入力測抵抗とほぼ同じ温度係数を有
する抵抗を使用して第１の反転増幅器の利得の温
度特性と第２の反転増幅器の利得の温度特性を逆
特性せしめ、第１の反転増幅器の出力と第２の反
転増幅器の出力との電位差を所定比で分圧して取
り出すことにより、信号源の温度特性を補償する
ことができる。 As explained above, the present invention has first and second inverting amplifiers that amplify the voltage of the same signal source, uses a resistor having a temperature coefficient for the input resistance of the first inverting amplifier, and using a resistor having substantially the same temperature coefficient as the input resistor as a feedback resistor of the second inverting amplifier, so that the temperature characteristics of the gain of the first inverting amplifier and the temperature characteristics of the gain of the second inverting amplifier are reversed; By dividing and extracting the potential difference between the output of the first inverting amplifier and the output of the second inverting amplifier at a predetermined ratio, it is possible to compensate for the temperature characteristics of the signal source.
第１図は本考案の一実施例の構成を示す回路
図。第２図は本考案の一実施例の作用の説明に供
する特性図。
１……信号源、４および５……反転増幅器、６
……ポテンシヨメータ、７……バツフア増幅器、
４４および５４……帰還抵抗。
FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a characteristic diagram for explaining the operation of an embodiment of the present invention. 1...Signal source, 4 and 5...Inverting amplifier, 6
...Potentiometer, 7...Buffer amplifier,
44 and 54...Feedback resistance.
Claims (1)
号源の電圧が供給されかつ該信号源の電圧を増幅
する第１の反転増幅器と、前記抵抗の温度特性と
ほぼ同一の温度特性を有する帰還抵抗を備え前記
第１の反転増幅器と逆極性の温度特性を呈しかつ
前記信号源の電圧を増幅する第２の反転増幅器
と、前記第１の反転増幅器の出力電圧と前記第２
の反転増幅器の出力電圧との電位差を分圧出力す
る分圧手段とを備えてなることを特徴とする増幅
装置。 a first inverting amplifier whose inverting input terminal is supplied with the voltage of a signal source via a resistor having temperature characteristics and which amplifies the voltage of the signal source; and a feedback resistor having temperature characteristics that are substantially the same as those of the resistor. a second inverting amplifier that amplifies the voltage of the signal source and has temperature characteristics opposite in polarity to that of the first inverting amplifier; and an output voltage of the first inverting amplifier and the second inverting amplifier.
1. An amplifier device comprising voltage dividing means for dividing and outputting a potential difference between the output voltage of the inverting amplifier and the output voltage of the inverting amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2103684U JPS60134319U (en) | 1984-02-16 | 1984-02-16 | Amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2103684U JPS60134319U (en) | 1984-02-16 | 1984-02-16 | Amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60134319U JPS60134319U (en) | 1985-09-06 |
| JPH0422565Y2 true JPH0422565Y2 (en) | 1992-05-25 |
Family
ID=30512074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2103684U Granted JPS60134319U (en) | 1984-02-16 | 1984-02-16 | Amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60134319U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4540301B2 (en) * | 2003-05-20 | 2010-09-08 | 三菱電機株式会社 | Radiation monitor |
-
1984
- 1984-02-16 JP JP2103684U patent/JPS60134319U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60134319U (en) | 1985-09-06 |
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