JPH01205611A - Current amplifier for photodiode sensor - Google Patents

Current amplifier for photodiode sensor

Info

Publication number
JPH01205611A
JPH01205611A JP3057788A JP3057788A JPH01205611A JP H01205611 A JPH01205611 A JP H01205611A JP 3057788 A JP3057788 A JP 3057788A JP 3057788 A JP3057788 A JP 3057788A JP H01205611 A JPH01205611 A JP H01205611A
Authority
JP
Japan
Prior art keywords
voltage
photodiode
bias voltage
amplifier
variable resistor
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
Application number
JP3057788A
Other languages
Japanese (ja)
Inventor
Naoki Oda
直樹 小田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP3057788A priority Critical patent/JPH01205611A/en
Publication of JPH01205611A publication Critical patent/JPH01205611A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE:To set a bias voltage over a wide range by consisting a bias circuit by a variable resistor dividing a DC voltage and a buffer amplifier receiving the voltage divided by the variable resistor, amplifying it and giving its output voltage to a photo diode as the bias voltage. CONSTITUTION:In case of applying a bias voltage to a photo diode 2, a prescribed voltage is fed between a variable resistor 4 and resistors 5a, 5b, a slider of the variable resistor 4 connects to a buffer amplifier 6 to given an output of the buffer amplifier 6 to the photo diode 2. Thus, the problem of the amplifier of this kind in a conventional system such that the bias voltage is almost unchanged due to the leakage of the bias current to a feedback resistor 3 is solved and the sensitivity measurement of the photo diode sensor is attained over a wider bias voltage range than that of the conventional amplifier.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、数10OKΩ以下の低抵抗値のフォトダイオ
ードセンサーに所定のバイアス電圧を加えることによっ
て、センサーの感度評価方法を改善するための電流アン
プに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention applies a predetermined bias voltage to a photodiode sensor with a low resistance value of several tens of ohms or less, thereby reducing current for improving the sensitivity evaluation method of the sensor. Regarding the amplifier.

(従来の技術) 第2図は従来のダイオードセンサー用電流アンプを示す
回路図であり、図において1はオペレイショナルアンプ
、2はpn接合型センサー(フォトダイオード)、3は
フィードバック抵抗、4は可変抵抗器、5a、5bは抵
抗、7はバイアス電圧モニタ一端子である。
(Prior art) Fig. 2 is a circuit diagram showing a conventional current amplifier for a diode sensor. In the figure, 1 is an operational amplifier, 2 is a pn junction sensor (photodiode), 3 is a feedback resistor, and 4 is a variable Resistors 5a and 5b are resistors, and 7 is a bias voltage monitor terminal.

従来のフォトダイオードセンサー用電流アンプは、第2
図に示すように、センサーにバイアス電圧を加える際、
可変抵抗器4の可変端子をセンサー2のP側(もしくは
n側)に直接に接続していた (例えば、 すンタ バ
ーバラ リす−チ センター ブローチャー、ニブ4シ
ツン17(Santa  Barbara  Re5e
arch  Center  Brochure。
Conventional current amplifiers for photodiode sensors
As shown in the figure, when applying a bias voltage to the sensor,
The variable terminal of the variable resistor 4 was directly connected to the P side (or n side) of the sensor 2 (for example, Santa Barbara Re5e
arch Center Brochure.

edition17)、58ページ)。edition 17), page 58).

(発明が解決しようとする課題) しかしながら、従来の電流アンプを0.1eV HaC
dTeフォトダイオードセンサーのように抵抗値の小さ
なダイオードと結合して感度特性を各バイアス電圧に対
して測定する場合、可変抵抗器4と抵抗5a、5bの消
費電力を小さくしようとすると、フォトダイオード2の
抵抗と抵抗5a、5bの値が同程度になり、バイアス電
流が抵抗5a、5b以外にフォトダイオード2とフィー
ドパ・lり抵抗3に流れてしまい、バイアス電圧が殆ど
変化しないという問題点がある。
(Problem to be solved by the invention) However, the conventional current amplifier is
When measuring the sensitivity characteristics for each bias voltage by combining a diode with a small resistance value such as a dTe photodiode sensor, in order to reduce the power consumption of the variable resistor 4 and resistors 5a and 5b, the photodiode 2 There is a problem that the values of the resistors 5a and 5b are approximately the same, and the bias current flows not only to the resistors 5a and 5b but also to the photodiode 2 and the feed path resistor 3, and the bias voltage hardly changes. .

本発明の目的は、バイアス電圧が広い範囲で設定できる
フォトダイオードセンサ用電流アンプの提供にある。
An object of the present invention is to provide a current amplifier for a photodiode sensor in which the bias voltage can be set over a wide range.

(課題を解決するための手段) 前述の課題を解決するために本発明が提供する手段は、
フォトダイオードの出力電流を入力端子に受ける演算増
幅器と、この演算増幅器の前記入力端子と出力端子との
間に接続されている帰還抵抗と、前記フォトダイオード
にバイアス電圧を供給するバイアス回路とを備えてなる
フォトダイオードセンサー用電流アンプであって、 前記バイアス回路は、直流電圧を分圧する可変抵抗器と
、この可変抵抗器で分圧された電圧を受けて増幅し出力
電圧を前記バイアス電圧として前記フォトダイオードに
供給するバッファアンプとからなることを特徴とする。
(Means for Solving the Problems) Means provided by the present invention to solve the above-mentioned problems are as follows:
An operational amplifier that receives the output current of the photodiode at its input terminal, a feedback resistor connected between the input terminal and the output terminal of the operational amplifier, and a bias circuit that supplies a bias voltage to the photodiode. A current amplifier for a photodiode sensor comprising: a variable resistor that divides a DC voltage; and a voltage divided by the variable resistor, which amplifies the voltage divided by the variable resistor and outputs the voltage as the bias voltage. It is characterized by consisting of a buffer amplifier that supplies the photodiode.

(作用) 第1図は、後に詳しく具体的に説明する本発明の一実施
例のフォトダイオードセンサー用電流アンプを示す回路
図である。同図において、従来例と同じ構成要素には第
2図と同じ符号が附しである。
(Function) FIG. 1 is a circuit diagram showing a current amplifier for a photodiode sensor according to an embodiment of the present invention, which will be explained in detail later. In the figure, the same components as in the conventional example are given the same reference numerals as in FIG.

本発明のフォトダイオードセンサー用TX aアンプは
、オペレイショナルアンプ1にフォトダイオード2とフ
ィードバック抵抗3を接続し、一方フオドダイオード2
にバイアス電圧を加えるなめに可変抵抗器4と抵抗5a
、5bの直列抵抗回路に所定の電圧を加え、可変抵抗器
4の可変端子をバッファーアンプ6に入力し、その出力
をフォトダイオード2のpHl!!l′iたけn側に接
続するという構成をとっている。
The TX a amplifier for a photodiode sensor of the present invention has a photodiode 2 and a feedback resistor 3 connected to an operational amplifier 1, and a photodiode 2 and a feedback resistor 3 connected to an operational amplifier 1.
Variable resistor 4 and resistor 5a are used to apply a bias voltage to
, 5b, the variable terminal of the variable resistor 4 is input to the buffer amplifier 6, and its output is the pHl! of the photodiode 2. ! The configuration is such that only l'i is connected to the n side.

さて、フォトダイオード2の性能において、感度やノイ
ズとバイアス電圧の関係を測定することは重要である。
Now, in terms of the performance of the photodiode 2, it is important to measure the relationship between sensitivity, noise, and bias voltage.

赤外線照射によってフォトダイオード2内に光電流を発
生させると、オペレイショナルアンプ1とフィードバッ
ク抵抗3で構成される電流アンプは、その光電流の値と
フィードバック抵抗3の抵抗値の積で決る電圧を端子9
に出力する。一般に、この出力電圧とノイズは、バイア
ス電圧に依存する。本発明では、バイアス電圧をフォト
ダイオード2に印加する場合、可変抵抗器4と抵抗5a
、5bの間に所定の電圧を加え、可変抵抗器4の可変端
子をバッファーアンプ6に入力してバッファーアンプ6
の出力をフォトダイオード2に接続しである。このよう
にすれば、フィードバック抵抗3へのバイアス電流の洩
れによってバイアス電圧が殆ど変化しないという従来の
この種のアンプの問題を解決することができる。
When a photocurrent is generated in the photodiode 2 by infrared irradiation, the current amplifier composed of the operational amplifier 1 and the feedback resistor 3 outputs a voltage determined by the product of the value of the photocurrent and the resistance value of the feedback resistor 3 to the terminal. 9
Output to. Generally, this output voltage and noise depend on the bias voltage. In the present invention, when applying a bias voltage to the photodiode 2, the variable resistor 4 and the resistor 5a
, 5b, and input the variable terminal of the variable resistor 4 to the buffer amplifier 6.
The output of the photodiode 2 is connected to the photodiode 2. In this way, the problem of conventional amplifiers of this type in which the bias voltage hardly changes due to leakage of bias current to the feedback resistor 3 can be solved.

(実施例) 以下に、本発明の実施例を第1図によって説明する4図
の実施例において、アンプ1とバッファーアンプ6には
0P227というオペアンプを、フォトダイオード2と
してゼロバイアスにおける抵抗値20にΩの0.1eV
 tlacdTc7 オドダイオードを、フィードバッ
ク抵抗3には100にΩの金属皮膜抵抗を、可変抵抗器
4には5にΩのポテンショメーターを、また抵抗5a、
5bには100にΩの金属皮膜抵抗を用いた。可変抵抗
器4と抵抗5a。
(Embodiment) In the embodiment shown in FIG. 4, which describes an embodiment of the present invention with reference to FIG. 0.1eV of Ω
tlacdTc7 odd diode, feedback resistor 3 is a 100Ω metal film resistor, variable resistor 4 is a 5Ω potentiometer, and resistor 5a,
A metal film resistor of 100Ω was used for 5b. variable resistor 4 and resistor 5a.

5bの直列抵抗回路にはアンプの電源電圧と同じ±9V
を加えた。このような回路構成でlIgcdTeフォト
ダイオフォトダイオード2ズとバイアス電圧の関係を測
定したところ、従来型電流アンプではフィードバック抵
抗3へのバイアス電流の洩れによってバイアス電圧が1
.03Vから1.05Vまでしか変化しなかったが、本
実施例の電流アンプでは−0,22Vから0.22Vと
いう広いバイアス電圧範囲にわたってフォトダイオード
センサー2の感度を測定することができた。
The series resistance circuit of 5b has ±9V, which is the same as the amplifier power supply voltage.
added. When we measured the relationship between the lIgcdTe photodiode photodiode 2 and the bias voltage with this circuit configuration, we found that in the conventional current amplifier, the bias voltage was 1 due to leakage of bias current to the feedback resistor 3.
.. However, the current amplifier of this example was able to measure the sensitivity of the photodiode sensor 2 over a wide bias voltage range of -0.22V to 0.22V.

(発明の効果) 以上に説明したように本発明によれば、フィードパツク
抵抗へのバイアス電流の洩れを防ぐことによって、従来
のアンプより広いバイアス電圧範囲にわたってフォトダ
イオードセンサーの感度測定が可能になった。
(Effects of the Invention) As explained above, according to the present invention, by preventing leakage of bias current to the feed pack resistor, it is possible to measure the sensitivity of a photodiode sensor over a wider bias voltage range than with conventional amplifiers. Ta.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明のフォトダイオードセンサー用電流アン
プの構成を示す回路図、第2図は従来のフォトダイオー
ドセンサー用電流アンプの構成を示す回路図である。 1・・・オペレイショナルアンプ、2・・・フォトダイ
オード、3・・・フィードバック抵抗、4・・・可変抵
抗器、5a、5b・・・抵抗、6・・・バッファーアン
プ、7・・・バイアス電圧モニタ一端子、8・・・出力
端子。
FIG. 1 is a circuit diagram showing the configuration of a current amplifier for a photodiode sensor according to the present invention, and FIG. 2 is a circuit diagram showing the configuration of a conventional current amplifier for a photodiode sensor. 1... Operational amplifier, 2... Photodiode, 3... Feedback resistor, 4... Variable resistor, 5a, 5b... Resistor, 6... Buffer amplifier, 7... Bias Voltage monitor 1 terminal, 8...output terminal.

Claims (1)

【特許請求の範囲】 フォトダイオードの出力電流を入力端子に受ける演算増
幅器と、この演算増幅器の前記入力端子と出力端子との
間に接続されている帰還抵抗と、前記フォトダイオード
にバイアス電圧を供給するバイアス回路とを備えてなる
フォトダイオードセンサー用電流アンプにおいて、 前記バイアス回路は、直流電圧を分圧する可変抵抗器と
、この可変抵抗器で分圧された電圧を受けて増幅し出力
電圧を前記バイアス電圧として前記フォトダイオードに
供給するバッファアンプとからなることを特徴とするフ
ォトダイオードセンサー用電流アンプ。
[Scope of Claims] An operational amplifier that receives an output current of a photodiode at its input terminal, a feedback resistor connected between the input terminal and the output terminal of this operational amplifier, and a bias voltage that is supplied to the photodiode. In the current amplifier for a photodiode sensor, the bias circuit includes a variable resistor that divides a DC voltage, and receives and amplifies the voltage divided by the variable resistor, and outputs the voltage as described above. A current amplifier for a photodiode sensor, comprising a buffer amplifier that supplies the photodiode as a bias voltage.
JP3057788A 1988-02-10 1988-02-10 Current amplifier for photodiode sensor Pending JPH01205611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3057788A JPH01205611A (en) 1988-02-10 1988-02-10 Current amplifier for photodiode sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3057788A JPH01205611A (en) 1988-02-10 1988-02-10 Current amplifier for photodiode sensor

Publications (1)

Publication Number Publication Date
JPH01205611A true JPH01205611A (en) 1989-08-18

Family

ID=12307708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3057788A Pending JPH01205611A (en) 1988-02-10 1988-02-10 Current amplifier for photodiode sensor

Country Status (1)

Country Link
JP (1) JPH01205611A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021111766A1 (en) * 2019-12-04 2021-06-10 ソニーセミコンダクタソリューションズ株式会社 Light-receiving device, method for controlling light-receiving device, and ranging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021111766A1 (en) * 2019-12-04 2021-06-10 ソニーセミコンダクタソリューションズ株式会社 Light-receiving device, method for controlling light-receiving device, and ranging device

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