JPH05500590A - Instrumentation amplifier with automatic gain control - Google Patents
Instrumentation amplifier with automatic gain controlInfo
- Publication number
- JPH05500590A JPH05500590A JP51327790A JP51327790A JPH05500590A JP H05500590 A JPH05500590 A JP H05500590A JP 51327790 A JP51327790 A JP 51327790A JP 51327790 A JP51327790 A JP 51327790A JP H05500590 A JPH05500590 A JP H05500590A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- comparator
- gain
- resistor
- read
- 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
- 238000005259 measurement Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
- H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Amplifiers (AREA)
- Analogue/Digital Conversion (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
- Control Of Amplification And Gain Control (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】 自動利得制御を有する計測増幅器 本発明は請求の範囲１の序文に従った形式の計測増幅器に関する。[Detailed description of the invention] Instrumentation amplifier with automatic gain control The invention relates to an instrumentation amplifier of the type according to the preamble of claim 1.
計測増幅器は、定義によればしばしば低レベルで、異なる形式のセンサからのア ナログ信号の測定のために意図された装置である。その増幅器は少しの演算増幅 器を使用して通常、構成されるが、ＵＪＴそしてＦＥＴ装置の周囲に設計される 増幅段の周囲に設けられても良い。計測増幅器は、増幅器の出力信号の範囲０、 ・・５ＶをＯ・・・１０２３の尺度をもった対応するディジタル信号に変換する ことができるコンピュータに接続されたアナログ・ディジタル変換器を経て通常 は読み取られる。一定の応用において、測定信号レベルは例えば全長３種類の大 きさを意味する１０ミリボルトから５ボルトまでを広く変えることができる。も しコンピュータに接続されたアナログ・ディジタル変換器Ｏ・・・５ｖの計測範 囲をもつならば、測定範囲の一層低い端は不十分な測定分解能を有する。１．： １０００の分解度をもつ例示の場合の変換器はすでに、はとんどのアナログ信号 の本来の分解度制限が０． １パーセントの等級にあるが、あらゆる正確さでミ リポルトレベルの測定には不十分である。技術上、その問題に対する実効的な解 決は、その出力信号が入力信号と対数的に対応しているいわゆる対数増幅器であ る。この方法の欠点は対数増幅器が、最も温度感知要素である順方向バイアスの ダイオードを使用して設けられなければならないことである。増幅器の熱的ドリ フトは、例えばサーミスタと呼ばれる温度依存抵抗の助けで、ある方法またはべ つの方法で補償されなければならない。対数増幅器の実際の設備は複雑でかつ高 価になる傾向がある。センサの強さを要求する適用の可能性はこの結果、費用の 要素によって容易に制限される。Instrumentation amplifiers, by definition, often have low-level inputs from different types of sensors. A device intended for the measurement of analog signals. The amplifier is a little bit of operational amplification. are typically constructed using devices designed around UJT and FET devices. It may also be provided around the amplification stage. The instrumentation amplifier is configured such that the range of the output signal of the amplifier is 0, ...Convert 5V to the corresponding digital signal with a scale of O...1023 Usually via an analog-to-digital converter connected to a computer that can is read. In certain applications, the measured signal level may be e.g. The strength can be varied widely from 10 millivolts to 5 volts. too Analog-to-digital converter O...5V measurement range connected to computer The lower end of the measurement range has insufficient measurement resolution. 1. : The converter in the example case with a resolution of 1000 already accepts most analog signals. The original resolution limit of 0. Although it is on the order of 1%, it can be compared with any accuracy. It is insufficient for measuring report levels. Technically, there is no effective solution to the problem. The solution is a so-called logarithmic amplifier whose output signal corresponds logarithmically to the input signal. Ru. The disadvantage of this method is that the logarithmic amplifier is a forward biased It must be provided using a diode. Amplifier thermal drift The foot can be installed in one way or another, for example with the help of a temperature-dependent resistor called a thermistor. must be compensated in one way. The actual equipment for logarithmic amplifiers is complex and expensive. It tends to be expensive. This results in potential applications that require high sensor strength, resulting in lower costs. Easily limited by elements.
本発明の目的は、簡単でかつ経済性の良い計測増幅器を製造することであり、そ の計測増幅器は、たとえ信号振幅がいくつかのオーダの大きさの範囲で変わって も十分な精度でセンサのアナログ出力信号を測定できることである。The purpose of the present invention is to manufacture a simple and economical instrumentation amplifier; instrumentation amplifiers, even if the signal amplitude varies over a range of several orders of magnitude. It is also possible to measure the analog output signal of the sensor with sufficient accuracy.
本発明の主な利点は基礎的構成要素の使用による低価格にある。本発明に従う増 幅器は、補償することを困難にする対数増幅器の大きな温度依存性を回避する。The main advantage of the invention is its low cost due to the use of basic components. Increase according to the invention The amplifier avoids the large temperature dependence of logarithmic amplifiers, which makes it difficult to compensate.
上述の機能を備えるために、本発明は開示された請求の範囲に述べられたように 主に特徴付けられている。In order to provide the above-mentioned features, the present invention is as set out in the disclosed claims. Mainly characterized.
図１は動作原理および構成要素レベルにおける増幅器の可能な実際的な例示を示 す。Figure 1 shows the operating principle and a possible practical illustration of the amplifier at component level. vinegar.
本発明に従うと、図１に示される計測増幅器はその出力信号が常に例えば１・・ ・１０Ｖの範囲にあるまで自動利得制御を実行するための増幅器を製作する設計 によって備えられる。増幅器は、例えば１ミリボルトから１０ミリボルトまでほ とんど同じ精度で拡張する電圧間隔を測定することができる。本増幅器は、対数 増幅器において補償することが困難である大きな熱的ドリフトを避ける、簡単な 基本的構成要素を使用して構成されることができる。増幅器１は、一度にひとつ のレジスタが増幅器出力から入力に接続されるように、マルチプレクサ２とレジ スタ３を含むフィードバック回路網をもって設けられている。マルチプレクサは 制御ライン４を経て制御される。制御ラインはアップ／ダウン・カウンタ５によ って駆動される。増幅器の出力電圧は、比較器６の助けでＩＶ基準電圧に対して 比較される。もし出力電圧がＩＶ以下であるならば、比較器出力は論理１状態に なりそしてカウンタは増分される。カウンタ５の出力ライン４はそのチャンネル を変更するマルチプレクサ２を制御し、それによって一層大きい値のフィードバ ンク・レジスタ３が選択される。負荷の重いフィードバックに依存して、増幅器 の出力は常にＩ■に維持される。増幅器の利得はカウンタ５の出力ラインの状態 からコンピュータにより読み取られることができる。。According to the invention, the instrumentation amplifier shown in FIG. - Design to create an amplifier to perform automatic gain control up to 10V range provided by. Amplifiers can be used, for example, from 1 millivolt to 10 millivolts. Extending voltage intervals can be measured with almost the same accuracy. This amplifier is logarithmic A simple method that avoids large thermal drifts that are difficult to compensate for in amplifiers. Can be constructed using basic building blocks. Amplifier 1, one at a time multiplexer 2 and the register so that the register is connected from the amplifier output to the input. A feedback network including a star 3 is provided. The multiplexer is It is controlled via control line 4. The control line is connected to the up/down counter 5. is driven. The output voltage of the amplifier is adjusted with respect to the IV reference voltage with the help of comparator 6. be compared. If the output voltage is less than IV, the comparator output will be in a logic 1 state. and the counter is incremented. Output line 4 of counter 5 is the channel control multiplexer 2 to change the Link register 3 is selected. Amplifiers that rely on heavily loaded feedback The output of is always maintained at I■. The gain of the amplifier is the state of the output line of counter 5. can be read by a computer from .
本発明の上述した簡単な実施例は最も基本的である５、そこて、開示さ第１た請 求の範囲内での変更を許容する発明の範囲を制限しないことが理解されるべきで ある。主な設計において、増幅器構成はいくつかの異なる構成要素の代替の助け で構成されることができる。例えば、マルチプレクサは論理回路の別の形式によ って再配置されることができる。The above-described simple embodiment of the invention is the most basic5, so it is It should be understood that there is no limitation on the scope of the invention allowing for modifications within the scope of the invention. be. In the main design, the amplifier configuration helps with the substitution of several different components. It can be composed of For example, a multiplexer is another form of logic circuit. can be rearranged.
ＦＩＧ、１ 国際調査報告 国際調査報告 ＰＣＴ／Ｆｌ ９０１００２２６FIG.1 international search report international search report PCT/Fl 90100226
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI894591 | 1989-09-28 | ||
| FI894591A FI87861C (en) | 1989-09-28 | 1989-09-28 | An automatic amplification control instrumentation amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05500590A true JPH05500590A (en) | 1993-02-04 |
Family
ID=8529071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51327790A Pending JPH05500590A (en) | 1989-09-28 | 1990-09-26 | Instrumentation amplifier with automatic gain control |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0494198A1 (en) |
| JP (1) | JPH05500590A (en) |
| CA (1) | CA2066705A1 (en) |
| FI (1) | FI87861C (en) |
| WO (1) | WO1991005406A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886017A (en) * | 1986-06-11 | 1999-03-23 | Procyon Pharmaceuticals, Inc. | Protein kinase C modulators. E. |
| FR2702581B1 (en) * | 1993-03-12 | 1995-06-02 | Sagem | Multiplier circuit with potentiometers and electric energy meter incorporating such a circuit. |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2853642A1 (en) * | 1978-12-09 | 1980-06-12 | Biotronik Mess & Therapieg | AMPLITUDE CONTROL UNIT FOR ECG SIGNALS |
| US4739307A (en) * | 1984-01-31 | 1988-04-19 | Analogic Corporation | Multichannel predictive gain amplifier system |
| US4553104A (en) * | 1984-03-01 | 1985-11-12 | Honeywell Inc. | Method of compensating an amplifier system having a variable gain amplifier to achieve a constant overall system signal gain and an apparatus utilizing the same |
| FR2592537B1 (en) * | 1985-12-30 | 1991-05-31 | Inst Francais Du Petrole | DEVICE FOR THE AMPLIFICATION AND SAMPLING OF MULTIPLEX ANALOG SIGNALS. |
-
1989
- 1989-09-28 FI FI894591A patent/FI87861C/en not_active IP Right Cessation
-
1990
- 1990-09-26 EP EP19900914180 patent/EP0494198A1/en not_active Withdrawn
- 1990-09-26 CA CA 2066705 patent/CA2066705A1/en not_active Abandoned
- 1990-09-26 JP JP51327790A patent/JPH05500590A/en active Pending
- 1990-09-26 WO PCT/FI1990/000226 patent/WO1991005406A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI894591A0 (en) | 1989-09-28 |
| FI894591A (en) | 1991-03-29 |
| EP0494198A1 (en) | 1992-07-15 |
| CA2066705A1 (en) | 1991-03-29 |
| WO1991005406A1 (en) | 1991-04-18 |
| FI87861C (en) | 1993-02-25 |
| FI87861B (en) | 1992-11-13 |
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