JPS59202035A - Current-voltage conversion circuit for light input - Google Patents

Current-voltage conversion circuit for light input

Info

Publication number
JPS59202035A
JPS59202035A JP7691883A JP7691883A JPS59202035A JP S59202035 A JPS59202035 A JP S59202035A JP 7691883 A JP7691883 A JP 7691883A JP 7691883 A JP7691883 A JP 7691883A JP S59202035 A JPS59202035 A JP S59202035A
Authority
JP
Japan
Prior art keywords
current
conversion circuit
photodetector
voltage
voltage conversion
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
JP7691883A
Other languages
Japanese (ja)
Inventor
Tomizo Terasawa
富三 寺澤
Shugo Endo
遠藤　修吾
Masao Arakawa
雅夫 荒川
Shuichiro Yamaguchi
周一郎 山口
Masahiko Suzumura
正彦 鈴村
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP7691883A priority Critical patent/JPS59202035A/en
Publication of JPS59202035A publication Critical patent/JPS59202035A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Transform (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To enable the correction of a leakage current factor of a photo detector in a current-voltage conversion circuit of a light input by employing a correction element the same in the leakage current characteristic as the photo detector. CONSTITUTION:A light input is converted into current with a photo detector 1 and then, into voltage with a current-voltage converter 2. A correction element such as photodiode 4 the same in the leakage current characteristic as the detector 1 is connected to a reference voltage terminal 3 of a feedback operational amplifier 3 of the converter 2. This cancels the effect of leakage current from the detector 1 to correct the leakage current element of the photo detector in a current-voltage conversion circuit of the light input.

Description

【発明の詳細な説明】 〔技術分野〕 この発明はオプトエレクトロニクスの分野における光入
力を電流に変換して出力する光検知器と、その出力を入
力とする電流電圧変換器とからなる光入力の電流電圧変
換回路に関する。[Detailed Description of the Invention] [Technical Field] This invention relates to an optical input detector in the field of optoelectronics, which includes a photodetector that converts optical input into a current and outputs it, and a current-voltage converter that uses the output as an input. It relates to a current-voltage conversion circuit.

〔背景技術〕[Background technology]

斜上の如き光入力の電流電圧変換回路において、従来は
光検知器のもれ電流に対する補正がなされていなかった
ためにオフセット電圧が出るという欠点があった。Conventionally, in an optical input current-voltage conversion circuit such as the one shown above, there has been a drawback that an offset voltage is generated because no correction is made for the leakage current of the photodetector.

〔発明の目的〕[Purpose of the invention]

この発明は光検知器のもれ電流要素を補正する光入力の
電流電圧変換回路を提供せんとするものである。The present invention aims to provide an optical input current-voltage conversion circuit for correcting leakage current elements of a photodetector.

〔発明の開示〕[Disclosure of the invention]

この発明は上記の点に鑑みてなされたものであり、その
要旨とするところは光入力を電流に変換して出力する光
検知器と、その出力を入力とする電流電圧変換器とから
なる光入力の電流電圧変換１ｍ１Ｍおいて、電流電圧変
換器の基準入力端子。This invention was made in view of the above points, and its gist is to provide a photodetector that converts optical input into current and outputs it, and a current-voltage converter that uses the output as input. Input current-voltage conversion 1m1M, reference input terminal of current-voltage converter.

光検知器のもれ電流補正用として光検知器と同じもれ電
流特性をもつ補正素子を接続したことを特徴とする光入
力の電流電圧変換回路である。This is an optical input current-voltage conversion circuit characterized in that a correction element having the same leakage current characteristics as the photodetector is connected to correct the leakage current of the photodetector.

以下、この発明を因示せる一実施例に基づいて説明する
。Hereinafter, this invention will be explained based on an embodiment.

この発明による光入力の電流電圧変換回路は基本的光入
力を電流変換して出力する光検知器（１）とこの光検知
器（１）の出力を入力とし、光検知器（１）の出力電流
を電圧に変換する電流電圧変換器（２）から構成される
。The optical input current-voltage conversion circuit according to the present invention has a photodetector (1) that converts the basic optical input into current and outputs it, and the output of this photodetector (1) as input, and the output of the photodetector (1). It consists of a current-voltage converter (2) that converts current into voltage.

図示例の電流電圧変換器（２）としてはオペアンプに負
帰還をかけたものが使用されている。電流電圧変換器（
２）の基準電圧端子（３）に、光検知器（１）と同様の
もれ電流特性をもつ補正素子（４）を接続する。The illustrated current-voltage converter (2) uses an operational amplifier with negative feedback. Current voltage converter (
A correction element (4) having the same leakage current characteristics as the photodetector (1) is connected to the reference voltage terminal (3) of 2).

この素子（４）は、光検知器（１）を形成する集積回路
と同一の集積回路に作られる。例えば、光検知器（１）
としてフォトダイオードを用いれば電流電圧変換器（２
）の基準電圧入力端子にも同じフォトダイオードを補正
素子（４）として接続しζこの補正素子（４）には光を
反射しない様にすれば、光検知器（１）として使われて
いるフォトダイオードのもれ電流と同じ量のもれ電流が
、電流電圧変換器（２）の基準電圧入力端子に接続した
補正素子（４）たるフォトダイオードにも流れる。This element (4) is made in the same integrated circuit as that forming the photodetector (1). For example, photodetector (1)
If a photodiode is used as a current-voltage converter (2
) is also connected as a correction element (4) to the reference voltage input terminal of The same amount of leakage current as the leakage current of the diode also flows through the photodiode serving as the correction element (4) connected to the reference voltage input terminal of the current-voltage converter (2).

而して電流電圧変換器（２）の電流入力端子（５）と基
準電圧入力端子（３）に入るもれ電流の影響とは等しく
相殺されるのである。Thus, the effects of leakage currents entering the current input terminal (5) and reference voltage input terminal (3) of the current-voltage converter (2) are equally canceled out.

もし、光検知器（１）の、もれ電流特性と同じ特性をも
つ補正素子（４）がなければ、光検知器（１）の°もれ
電流によって、電流入力端子（５）にオフセット電流が
生じ、出力１ども、オフセット電圧が生じるのであるが
、上記構成によりオフセット電圧は防止されているので
ある。If there is no correction element (4) having the same characteristics as the leakage current characteristics of the photodetector (1), an offset current will be generated at the current input terminal (5) due to the leakage current of the photodetector (1). occurs, and an offset voltage is generated on both outputs, but the above configuration prevents the offset voltage.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば光検知器ｆ１１に生ずる
もれ電流の影響を除去することができるので、電流電圧
変換器にオフセット電圧が出るのを防止できるのである
。As described above, according to the present invention, it is possible to eliminate the influence of leakage current occurring in the photodetector f11, and therefore it is possible to prevent offset voltage from appearing in the current-voltage converter.

また補正素子を光検知器と同一の集積回路に形成したの
で相互のもれ電流特性はきわめて等しく補正効果が大な
のである。Furthermore, since the correction element and the photodetector are formed in the same integrated circuit, their leakage current characteristics are very equal, and the correction effect is large.

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

図面はこの発明の一実施例を示す回路図である。 The drawing is a circuit diagram showing an embodiment of the present invention.

Claims (2)

【特許請求の範囲】[Claims] （１）　　光入力を電流に変換して出力する光検知器と
、その出力を入力とする電流電圧変換器とからなる光入
力の電流電圧変換回路において、電流電圧変換器の基準
入力端子１（光検知器のもれ電流補正用として光検知器
と同じもれ電流特性をもつ補正素子を接続したことを特
徴とする光入力の電流電圧変換回路。(1) In an optical input current-voltage conversion circuit consisting of a photodetector that converts optical input into a current and outputs it, and a current-voltage converter that receives the output as input, the reference input terminal 1 of the current-voltage converter ( A current-voltage conversion circuit for optical input, characterized in that a correction element having the same leakage current characteristics as the photodetector is connected to correct the leakage current of the photodetector. （２）光検知器と補正素子を同一集積回路に形成するこ
とを特徴とする第１項記載の光入力の電流電圧変換回路
。(2) The optical input current-voltage conversion circuit according to item 1, wherein the photodetector and the correction element are formed in the same integrated circuit.
JP7691883A 1983-04-30 1983-04-30 Current-voltage conversion circuit for light input Pending JPS59202035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7691883A JPS59202035A (en) 1983-04-30 1983-04-30 Current-voltage conversion circuit for light input

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7691883A JPS59202035A (en) 1983-04-30 1983-04-30 Current-voltage conversion circuit for light input

Publications (1)

Publication Number Publication Date
JPS59202035A true JPS59202035A (en) 1984-11-15

Family

ID=13619070

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7691883A Pending JPS59202035A (en) 1983-04-30 1983-04-30 Current-voltage conversion circuit for light input

Country Status (1)

Country Link
JP (1) JPS59202035A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991018421A1 (en) * 1990-05-11 1991-11-28 Northern Telecom Limited Laser diode, method for making laser diode and method for monitoring performance of laser diode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5456390A (en) * 1977-10-14 1979-05-07 Hitachi Ltd Light detecting method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5456390A (en) * 1977-10-14 1979-05-07 Hitachi Ltd Light detecting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991018421A1 (en) * 1990-05-11 1991-11-28 Northern Telecom Limited Laser diode, method for making laser diode and method for monitoring performance of laser diode

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