JPH04282872A - Photoelectric conversion circuit - Google Patents
Photoelectric conversion circuitInfo
- Publication number
- JPH04282872A JPH04282872A JP3072463A JP7246391A JPH04282872A JP H04282872 A JPH04282872 A JP H04282872A JP 3072463 A JP3072463 A JP 3072463A JP 7246391 A JP7246391 A JP 7246391A JP H04282872 A JPH04282872 A JP H04282872A
- Authority
- JP
- Japan
- Prior art keywords
- photoelectric conversion
- circuit
- resonance
- diode
- photodiode
- 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
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 38
- 230000002542 deteriorative effect Effects 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は光電変換回路に関し、
特に、種々の外乱光に含まれた信号光を選択する機能を
持つ光電変換回路に関するものである。[Industrial Application Field] This invention relates to a photoelectric conversion circuit.
In particular, the present invention relates to a photoelectric conversion circuit having a function of selecting signal light included in various types of disturbance light.
【０００２】0002
【従来の技術】図３と図４に従来の光電変換回路の回路
図を示す。これらの図において、１はフォトダイオード
（ＰＤ）、２はフォトダイオードに入射する光、８は抵
抗（Ｒ１ ）、７はフォトダイオード１で発生した光電
流（ＩＬ ）、４は出力端子、５は電源端子、９は接地
端子を示している。図３はフォトダイオード１を零バイ
アスで動作させるものであり、一端が出力端子４、他端
が接地端子９に接続されたフォトダイオード１に抵抗８
を並列に接続している。また図４はフォトダイオード１
を逆バイアスで動作させるものであり、一端が電源端子
５に接続されたフォトダイオード１の他端に直列に抵抗
８を接続するとともに、抵抗８を接地端子９に接続し、
フォトダイオード１と抵抗８との間から出力を得ている
。2. Description of the Related Art FIGS. 3 and 4 show circuit diagrams of conventional photoelectric conversion circuits. In these figures, 1 is the photodiode (PD), 2 is the light incident on the photodiode, 8 is the resistor (R1), 7 is the photocurrent (IL) generated in photodiode 1, 4 is the output terminal, and 5 is the A power terminal and 9 indicate a ground terminal. In FIG. 3, the photodiode 1 is operated with zero bias, and a resistor 8 is connected to the photodiode 1, which has one end connected to the output terminal 4 and the other end connected to the ground terminal 9.
are connected in parallel. Also, Figure 4 shows photodiode 1.
is operated with reverse bias, one end of which is connected to the power supply terminal 5, and the other end of the photodiode 1 is connected in series with a resistor 8, and the resistor 8 is connected to the ground terminal 9.
An output is obtained between the photodiode 1 and the resistor 8.
【０００３】次に動作について説明する。フォトダイオ
ード１に光２が照射されると、フォトダイオード１に光
電流７が発生し、この光電流７は抵抗８で電圧降下して
、抵抗８の両端に光電変換された電圧が発生する。この
電圧を出力端子４に取り出すようにしている。Next, the operation will be explained. When the photodiode 1 is irradiated with the light 2, a photocurrent 7 is generated in the photodiode 1, this photocurrent 7 has a voltage drop across the resistor 8, and a photoelectrically converted voltage is generated across the resistor 8. This voltage is taken out to the output terminal 4.
【０００４】0004
【発明が解決しようとする課題】従来の光電変換回路は
以上のように構成されているので、照射された光はどの
ような種類の光であれ、光電変換されて出力されてしま
い、特定の周波数で振幅変調された信号光を抽出するこ
とができず、光電変換特性に選択特性を持たすことはで
きなかった。[Problem to be Solved by the Invention] Conventional photoelectric conversion circuits are configured as described above, so whatever type of light is irradiated, it is photoelectrically converted and output, and a specific type of light is output. It was not possible to extract signal light whose amplitude was modulated by frequency, and it was not possible to provide selective characteristics to the photoelectric conversion characteristics.
【０００５】この発明は光電変換特性に選択特性を持た
せるためになされたもので、特定の周期を持って強弱特
性を持つ信号光だけを選択して出力できる光電変換回路
を得ることを目的とする。[0005] This invention was made in order to impart selection characteristics to the photoelectric conversion characteristics, and its purpose is to obtain a photoelectric conversion circuit that can select and output only signal light having a specific cycle and intensity characteristics. do.
【０００６】[0006]
【課題を解決するための手段】本発明に係る光電変換回
路は、光電変換素子と直列または並列に共振回路を接続
した光電変換回路において、光電変換素子で発生する光
電流と同一方向に電流を流せるようにダイオードを光電
変換素子と直列に設けたものである。[Means for Solving the Problems] A photoelectric conversion circuit according to the present invention is a photoelectric conversion circuit in which a resonant circuit is connected in series or parallel to a photoelectric conversion element, and a current is generated in the same direction as the photocurrent generated in the photoelectric conversion element. A diode is installed in series with a photoelectric conversion element to allow current to flow.
【０００７】[0007]
【作用】この発明における光電変換回路は、光電変換素
子に直列にダイオードを接続するとともに、共振回路を
接続したので、照射された光は光電変換素子で光電変換
され、光電流となり、この光電流は、フォトダイオード
に直列接続されたダイオードの順方向電流として流れ、
共振回路に流れる。共振回路は光電流の内、共振周波数
と同一の周波数成分を持つ光電流だけに対して共振現象
を起こすことで、共振周波数成分を持つ光電流だけを共
振回路で電圧に変換する。共振周波数成分以外の光電流
は、共振回路で電圧に変換されないため、出力として得
られない。[Operation] In the photoelectric conversion circuit according to the present invention, a diode is connected in series to the photoelectric conversion element, and a resonant circuit is also connected, so that the irradiated light is photoelectrically converted by the photoelectric conversion element, becomes a photocurrent, and this photocurrent flows as a forward current of a diode connected in series with the photodiode,
Flows into the resonant circuit. The resonant circuit causes a resonance phenomenon in only the photocurrent that has the same frequency component as the resonant frequency, and converts only the photocurrent that has the resonant frequency component into a voltage using the resonant circuit. Photocurrents other than the resonant frequency components are not converted into voltage by the resonant circuit, and therefore cannot be obtained as output.
【０００８】[0008]
【実施例】図１はこの発明の一実施例による光電変換回
路を示す回路図であり、光電変換素子を零バイアスで動
作させた例を示している。図において、１は光２を受光
し、これを光電流に変換する光電変換素子であるフォト
ダイオード（ＰＤ）、７はフォトダイオード１で発生す
る光電流（ＩＬ ）、３はフォトダイオード１で発生す
る光電流７と同一方向に電流を流せるようにフォトダイ
オード１と直列に接続したダイオード、４は光電変換回
路の出力端子、６はフォトダイオード１と並列に接続し
た共振回路、９は共振回路６とダイオード３の共通端子
を接地電位に接続する接地端子である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing a photoelectric conversion circuit according to an embodiment of the present invention, and shows an example in which a photoelectric conversion element is operated at zero bias. In the figure, 1 is a photodiode (PD) which is a photoelectric conversion element that receives light 2 and converts it into a photocurrent, 7 is a photocurrent (IL) generated in photodiode 1, and 3 is a photocurrent generated in photodiode 1. 4 is an output terminal of the photoelectric conversion circuit, 6 is a resonant circuit connected in parallel with photodiode 1, and 9 is a resonant circuit 6. This is a ground terminal that connects the common terminal of the diode 3 and the diode 3 to the ground potential.
【０００９】また、図２はこの発明の他の実施例による
光電変換回路を示す回路図である。図において、図１と
同一符号は同一部分を示し、光電変換素子を逆バイアス
で動作させた例を示しており、フォトダイオード１で発
生する光電流７で同一方向に電流を流せるようにフォト
ダイオード１と直列にダイオード３が接続され、さらに
、ダイオードＤ１ に直列に共振回路６を接続している
。また、光電変換回路の出力はダイオード３と共振回路
６の接続点から得ている。なお、これらの実施例の共振
回路は、いずれも並列共振型の共振回路により構成して
いる。FIG. 2 is a circuit diagram showing a photoelectric conversion circuit according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same parts and show an example in which the photoelectric conversion element is operated with a reverse bias. A diode 3 is connected in series with the diode D1, and a resonant circuit 6 is further connected in series with the diode D1. Further, the output of the photoelectric conversion circuit is obtained from the connection point between the diode 3 and the resonant circuit 6. Note that the resonant circuits of these embodiments are all constituted by parallel resonant type resonant circuits.
【００１０】次に動作について説明する。フォトダイオ
ード（ＰＤ）１で発生した光電流（ＩＬ ）７の内、共
振回路６で共振した光電流だけが抽出できるため、共振
回路は同調回路として動作させる。光電流７が順方向と
なるよう接続したダイオード（Ｄ１ ）３は、共振回路
の共振の尖鋭度（ｑｕａｌｉｔｙ ｆａｃｔｏｒ；Ｑ）
がダウンするのを防止するために挿入したものであり、
共振回路のインダクタンスによって発生する逆起電流を
阻止する役目を果たしている。このダイオード３を挿入
することで、共振回路の共振の尖鋭度Ｑを高く維持でき
るため、同調特性を高めて、共振周波数成分だけを光電
流の中から選択できる。Next, the operation will be explained. Of the photocurrent (IL) 7 generated in the photodiode (PD) 1, only the photocurrent that resonates in the resonant circuit 6 can be extracted, so the resonant circuit is operated as a tuned circuit. The diode (D1) 3 connected so that the photocurrent 7 is in the forward direction is a diode (D1) 3 that controls the sharpness (quality factor; Q) of the resonance of the resonant circuit.
It was inserted to prevent it from going down.
It plays the role of blocking back electromotive current generated by the inductance of the resonant circuit. By inserting this diode 3, the resonance sharpness Q of the resonant circuit can be maintained high, so that the tuning characteristics can be improved and only the resonant frequency component can be selected from the photocurrent.
【００１１】以上のように上記の実施例によれば、共振
型の光電変換回路において、フォトダイオード１と直列
にダイオード３を挿入するようにしたので、共振回路の
共振の尖鋭度のダウンを防止でき、共振回路の同調特性
を劣化させることなく、光電変換回路における特定周波
数で振幅変調された信号光のみを有効に選択して出力す
ることができる。As described above, according to the above embodiment, the diode 3 is inserted in series with the photodiode 1 in the resonant photoelectric conversion circuit, thereby preventing the sharpness of the resonance of the resonant circuit from decreasing. Therefore, it is possible to effectively select and output only the signal light amplitude-modulated at a specific frequency in the photoelectric conversion circuit without deteriorating the tuning characteristics of the resonant circuit.
【００１２】なお、上記の実施例では共振回路６として
並列共振回路を用いたが、直列共振回路でも構成できる
と考えられる。しかし、直列共振回路によるものは、共
振周波数の設定において、他の素子からの影響を受けや
すいため実用的には難しい。Although a parallel resonant circuit is used as the resonant circuit 6 in the above embodiment, it is conceivable that a series resonant circuit may also be used. However, it is difficult to use a series resonant circuit because it is easily influenced by other elements in setting the resonant frequency.
【００１３】[0013]
【発明の効果】以上のように、本発明によれば光電変換
素子に直列または並列に共振回路を接続し、さらに光電
変換素子に直列にダイオードを接続したので、共振回路
の共振の尖鋭度Ｑを高く維持でき、共振回路の同調特性
を劣化させずに共振動作させることができ、光電変換回
路の選択特性の向上を図れるものが得られるという効果
がある。As described above, according to the present invention, a resonant circuit is connected in series or parallel to a photoelectric conversion element, and a diode is further connected in series to the photoelectric conversion element, so that the resonance sharpness Q of the resonant circuit can be reduced. This has the effect that it is possible to maintain a high value, to perform resonance operation without deteriorating the tuning characteristics of the resonant circuit, and to improve the selection characteristics of the photoelectric conversion circuit.
【図１】この発明の一実施例による光電変換回路を示す
回路図である。FIG. 1 is a circuit diagram showing a photoelectric conversion circuit according to an embodiment of the present invention.
【図２】この発明の他の実施例による光電変換回路を示
す回路図である。FIG. 2 is a circuit diagram showing a photoelectric conversion circuit according to another embodiment of the invention.
【図３】従来の光電変換回路の一部を示す回路図である
。FIG. 3 is a circuit diagram showing part of a conventional photoelectric conversion circuit.
【図４】従来の光電変換回路の一部を示す回路図である
。FIG. 4 is a circuit diagram showing part of a conventional photoelectric conversion circuit.
１ フォトダイオード ２ 光 ３ ダイオード ４ 出力端子 ５ 電源端子 ６ 共振回路 ７ 光電流 ８ 抵抗 ９ 接地端子 1 Photodiode 2. Light 3 Diode 4 Output terminal 5 Power terminal 6 Resonant circuit 7 Photocurrent 8 Resistance 9 Ground terminal
Claims (1)
された共振回路と、前記光電変換素子で発生する光電流
と同一方向に電流が流れるように、前記光電変換素子と
直列に挿入されたダイオードとを備えたことを特徴とす
る光電変換回路。1. A resonant circuit connected in series or parallel with a photoelectric conversion element, and a diode inserted in series with the photoelectric conversion element so that a current flows in the same direction as the photocurrent generated in the photoelectric conversion element. A photoelectric conversion circuit comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072463A JPH04282872A (en) | 1991-03-11 | 1991-03-11 | Photoelectric conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072463A JPH04282872A (en) | 1991-03-11 | 1991-03-11 | Photoelectric conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04282872A true JPH04282872A (en) | 1992-10-07 |
Family
ID=13490026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3072463A Pending JPH04282872A (en) | 1991-03-11 | 1991-03-11 | Photoelectric conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04282872A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006102737A (en) * | 2004-09-07 | 2006-04-20 | Nisshin Seifun Group Inc | Fine particle manufacturing method |
| JP2007158669A (en) * | 2005-12-05 | 2007-06-21 | Dx Antenna Co Ltd | Optical terminal unit and optical subscriber terminal equipment |
| JP2011078142A (en) * | 2011-01-19 | 2011-04-14 | Dx Antenna Co Ltd | Optical terminal unit |
-
1991
- 1991-03-11 JP JP3072463A patent/JPH04282872A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006102737A (en) * | 2004-09-07 | 2006-04-20 | Nisshin Seifun Group Inc | Fine particle manufacturing method |
| JP2007158669A (en) * | 2005-12-05 | 2007-06-21 | Dx Antenna Co Ltd | Optical terminal unit and optical subscriber terminal equipment |
| JP4708984B2 (en) * | 2005-12-05 | 2011-06-22 | Ｄｘアンテナ株式会社 | Optical terminal unit |
| JP2011078142A (en) * | 2011-01-19 | 2011-04-14 | Dx Antenna Co Ltd | Optical terminal unit |
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