JP3103175B2 - Optical receiver - Google Patents
Optical receiverInfo
- Publication number
- JP3103175B2 JP3103175B2 JP03328924A JP32892491A JP3103175B2 JP 3103175 B2 JP3103175 B2 JP 3103175B2 JP 03328924 A JP03328924 A JP 03328924A JP 32892491 A JP32892491 A JP 32892491A JP 3103175 B2 JP3103175 B2 JP 3103175B2
- Authority
- JP
- Japan
- Prior art keywords
- wiring path
- amplifier
- input terminal
- input
- light receiving
- 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 - Fee Related
Links
Landscapes
- Amplifiers (AREA)
- Optical Communication System (AREA)
- Light Receiving Elements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、入射光を光電変換し
て増幅する光受信器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical receiver for photoelectrically converting incident light and amplifying the same.
【０００２】[0002]
【従来の技術】受光した入射光を光電変換して得られる
電気信号を増幅出力する従来の光受信器としては、例え
ば図２に示すようなものがある。2. Description of the Related Art As a conventional optical receiver for amplifying and outputting an electric signal obtained by photoelectrically converting received incident light, there is, for example, one shown in FIG.
【０００３】図２において、光受信器は、入射光を受け
て光電変換する受光素子１と、受光素子１で得られた電
気信号を増幅する増幅器２が集積化されてプリント基板
３に実装された集積回路４とを備えている。受光素子１
で得られた電気信号は、受光素子１の電極５1 、入力配
線路５2 、集積回路４の入力端子６1 を介して増幅器２
の入力端子７に与えられる。In FIG. 2, a light receiving device 1 for receiving incident light and performing photoelectric conversion and an amplifier 2 for amplifying an electric signal obtained by the light receiving device 1 are integrated and mounted on a printed circuit board 3. Integrated circuit 4. Light receiving element 1
Electrical signal obtained by the light receiving element 1 of the electrode 5 1, the input wiring lines 5 2, an integrated circuit amplifier 2 through the input terminal 6 1 4
To the input terminal 7.
【０００４】このような光受信器においては、受光素子
１によって得られる電気信号は非常に微弱なため、増幅
器２のゲインを高く設定しなければならない。このた
め、増幅器２は外部からのノイズの影響を受け易くな
る。In such an optical receiver, since the electric signal obtained by the light receiving element 1 is very weak, the gain of the amplifier 2 must be set high. Therefore, the amplifier 2 is easily affected by external noise.
【０００５】そこで、このような不具合を防止するため
に、増幅器２の入力端子６1 に接続されている入力配線
路５2 を集積回路４の接地端子６2 に接続されたシール
ド配線路８で取り囲み、また、受光素子１を接地電位が
与えられた金属ケース９で包囲し、増幅器２の入力端子
６1への外部ノイズの影響を防止するという対策が取ら
れている。Therefore, in order to prevent such a problem, a shield wiring lines 8 to an input wiring line 5 2 connected to the input terminal 61 is connected to the ground terminal 6 2 of the integrated circuit 4 of the amplifier 2 It surrounds and encloses the receiving element 1 in the metal case 9 which is supplied with the ground potential, measures of preventing influence of external noise to the input terminal 6 1 of the amplifier 2 is taken.
【０００６】しかしながら、このような構成において
は、増幅器２の入力端子７及び入力配線路５2 とシール
ド配線路８との間に浮遊容量が生じ、この浮遊容量によ
り光受信器の受信帯域が劣化していた。一般的に、受光
素子の接合容量は１P Ｆ程度であるが、上記浮遊容量も
１P Ｆ程度となるため、帯域は浮遊容量がない場合に比
べて１／２程度に劣化してしまう。However, in this structure, stray capacitance occurring between the input terminal 7 and the input wiring line 5 2 and the shield wiring path 8 of the amplifier 2, reception bandwidth of the optical receiver by the stray capacitance deteriorate Was. In general, the junction capacitance of the light receiving element is about 1 PF , but the stray capacitance is also about 1 PF, so that the band is reduced to about 1/2 as compared with the case where there is no stray capacitance.
【０００７】一方、受信帯域の劣化を防ぐために、シー
ルド配線路８を設けないようにすると、外部からのノイ
ズの影響を受けて、誤動作を招くおそれがあった。On the other hand, if the shield wiring path 8 is not provided in order to prevent the reception band from deteriorating, a malfunction may be caused due to the influence of external noise.
【０００８】[0008]
【発明が解決しようとする課題】以上説明したように、
シールド配線路を設けて、増幅器の入力側におけるノイ
ズ対策を施した従来の光受信器にあっては、シールド配
線路と入力配線路との間に生じる浮遊容量により、受信
帯域が劣化するという不具合を招いていた。As described above,
In conventional optical receivers that provide a shielded wiring path and take noise countermeasures on the input side of the amplifier, the reception bandwidth deteriorates due to stray capacitance generated between the shielded wiring path and the input wiring path. Was invited.
【０００９】そこで、この発明は、上記に鑑みてなされ
たものであり、その目的とするところは、受信帯域の劣
化を招くことなく、増幅手段の入力側における外部ノイ
ズを抑制して、誤動作を防止し得る光受信器を提供する
ことにある。Therefore, the present invention has been made in view of the above, and it is an object of the present invention to suppress external noise on the input side of an amplifying means without deteriorating a reception band and to prevent a malfunction. It is an object of the present invention to provide an optical receiver that can prevent such a situation.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、入射光を受けて光電変換する受光手段
と、前記受光手段で得られた電気信号を増幅する集積化
された増幅手段と、前記増幅手段の入力端子に接続され
ている配線路を包囲してシールドするシールド配線路
と、前記増幅手段と同一基板上に集積化され、入力端子
が前記増幅手段の入力端子に接続され、出力端子が前記
シールド配線路に接続されて、前記増幅手段の入力電圧
と同等の電圧を前記シールド配線路に供給する電圧フォ
ロワ手段とから構成される。To achieve the above object, the present invention provides a light receiving means for receiving incident light and performing photoelectric conversion, and an integrated amplifier for amplifying an electric signal obtained by the light receiving means. Means, a shield wiring path surrounding and shielding a wiring path connected to the input terminal of the amplifying means, and an input terminal connected to the input terminal of the amplifying means integrated on the same substrate as the amplifying means. And a voltage follower having an output terminal connected to the shield wiring path and supplying a voltage equivalent to an input voltage of the amplifying means to the shield wiring path.
【００１１】[0011]
【作用】上記構成において、この発明は、増幅手段の入
力端子に接続される配線路を包囲するシールド配線路の
電位を、増幅手段の入力端子に接続される配線路の電位
と同電位にするようにしている。In the above construction, the present invention makes the potential of the shielded wiring path surrounding the wiring path connected to the input terminal of the amplifying means the same as the potential of the wiring path connected to the input terminal of the amplifying means. Like that.
【００１２】[0012]
【実施例】以下、図面を用いてこの発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１はこの発明の一実施例に係る光受信器
の構成を示す図である。なお、図１において図２と同符
のものは同一物である。FIG. 1 is a diagram showing a configuration of an optical receiver according to one embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 2 denote the same components.
【００１４】図１において、光受信器は、図２に示した
従来の光受信器と同様に、受光素子１と、増幅器２が集
積化されてプリント基板３に実装された集積回路１０と
を備えている。In FIG. 1, the optical receiver includes a light receiving element 1 and an integrated circuit 10 in which an amplifier 2 is integrated and mounted on a printed circuit board 3 as in the conventional optical receiver shown in FIG. Have.
【００１５】集積回路１０には、本発明の特徴となる電
圧フォロワ回路１１が集積化されている。この電圧フォ
ロワ回路１１は、その入力端子１２が増幅器２の入力端
子７に接続され、出力端子１３が増幅器２の入力端子７
に接続されている入力配線路５2 を取り囲むシールド配
線路１４に、集積回路１０の外部端子６3 を介して接続
されている。また、電圧フォロワ回路１１の出力端子１
３は、受光素子１をシールドする金属ケース９にも接続
されている。In the integrated circuit 10, a voltage follower circuit 11, which is a feature of the present invention, is integrated. The voltage follower circuit 11 has an input terminal 12 connected to the input terminal 7 of the amplifier 2 and an output terminal 13 connected to the input terminal 7 of the amplifier 2.
The shield wiring path 14 surrounding the input wiring line 5 2 connected to, and is connected via the external terminals 6 3 of the integrated circuit 10. The output terminal 1 of the voltage follower circuit 11
3 is also connected to a metal case 9 for shielding the light receiving element 1.
【００１６】このような構成において、電圧フォロワ回
路１１は、受光電子１で得られ入力配線路５2 を介して
増幅器２に与えられる電気信号を受け、この電気信号の
電圧と同等の電圧を出力し、シールド配線路１４及び金
属ケース９に供給する。これにより、入力配線路５2 の
電位とシールド配線路１４の電位とは、常に同電位に保
たれることになる。In such a configuration, the voltage follower circuit 11 receives an electric signal provided to the amplifier 2 through an input wiring line 5 2 obtained by the light receiving electron 1, the output voltage equivalent to the voltage of the electrical signal Then, it is supplied to the shield wiring path 14 and the metal case 9. Thus, the potential of the input wiring line 5 second potential and the shield wiring path 14, always to be kept at the same potential.
【００１７】したがって、集積回路１０の入力端子６1
に接続されている配線と電圧フォロワ回路１１の出力端
子１３に接続されている配線との間には浮遊容量が存在
するが、両配線路には等しい電圧が印加されているた
め、浮遊容量には電流が流れず、実質的に浮遊容量が存
在していない場合と等しくなる。これにより、増幅器２
の入力側におけるシールド効果を損なうことなく、受信
帯域の劣化が防止される。Therefore, the input terminal 6 1 of the integrated circuit 10
There is a stray capacitance between the wiring connected to the wiring and the wiring connected to the output terminal 13 of the voltage follower circuit 11, but since the same voltage is applied to both wiring paths, Is substantially equal to the case where no current flows and no stray capacitance exists. Thereby, the amplifier 2
The deterioration of the reception band is prevented without impairing the shielding effect on the input side of the receiver.
【００１８】また、電圧フォロワ回路１１の出力によっ
てシールドしているため、インピーダンスは低くなり十
分なシールド効果を得ることが可能となる。Further, since the output is shielded by the output of the voltage follower circuit 11, the impedance is reduced and a sufficient shielding effect can be obtained.
【００１９】一方、電圧フォロワ回路１１を増幅器２の
入力端子に接続しているため、電圧フォロワ回路１１の
入力容量による帯域劣化が考えられる。しかしながら、
電圧フォロワ回路１１は増幅器２と同一基板上に集積化
されて増幅器２の入力端子７に接続されているため、電
圧フォロワ回路１１の入力容量を０．１P Ｆ程度のオー
ダに抑えることが可能となる。このため、受信帯域に対
する電圧フォロワ回路１１の入力容量の影響は無視する
ことができるようになる。On the other hand, since the voltage follower circuit 11 is connected to the input terminal of the amplifier 2, the band may be degraded due to the input capacitance of the voltage follower circuit 11. However,
A voltage follower circuit 11 because it is connected are integrated on the same substrate as the amplifier 2 to the input terminal 7 of the amplifier 2, it is possible to suppress the input capacitance of the voltage follower circuit 11 in the order of about 0.1 P F Becomes Therefore, the influence of the input capacitance of the voltage follower circuit 11 on the reception band can be neglected.
【００２０】なお、この発明は、上記実施例に限定され
ることはなく、例えば集積回路を多層基板に実装して、
横方向だけでなく上下方向においてもシールドを施し、
シールド効果を高めるようにしてもよい。また、実装基
板はプリント基板でなくセラミック基板を用いるように
してもよい。さらに、受光素子と集積回路とが同一基板
に集積化されているような場合であっても、本発明は有
効に作用して同等の効果を得ることが可能となる。It should be noted that the present invention is not limited to the above embodiment, and for example, an integrated circuit may be mounted on a multilayer substrate,
Shield not only in the horizontal direction but also in the vertical direction,
The shielding effect may be enhanced. Further, a ceramic substrate may be used as the mounting substrate instead of the printed substrate. Further, even when the light receiving element and the integrated circuit are integrated on the same substrate, the present invention can effectively operate to obtain the same effect.
【００２１】[0021]
【発明の効果】以上説明したように、この発明によれ
ば、光受信器における増幅器の入力側の被シールド配線
路と、この配線路を包囲するシールド配線路とを同電位
に設定するようにしたので、両配線路間の浮遊容量に電
流が流れることは防止される。これにより、シールド効
果を損なうことなく受信帯域の劣化を抑制することが可
能となる。As described above, according to the present invention, the shielded wiring path on the input side of the amplifier in the optical receiver and the shielded wiring path surrounding this wiring path are set to the same potential. Therefore, current is prevented from flowing through the stray capacitance between the two wiring paths. This makes it possible to suppress the deterioration of the reception band without impairing the shielding effect.
【図１】この発明の一実施例に係る光受信器の構成を示
す図である。FIG. 1 is a diagram showing a configuration of an optical receiver according to one embodiment of the present invention.
【図２】従来の光受信器の構成を示す図である。FIG. 2 is a diagram illustrating a configuration of a conventional optical receiver.
１ 受光素子 ２ 増幅器 ３ プリント基板 ４，１０ 集積回路 ５1 受光素子の電極 ５2 入力配線路 ６1 集積回路の入力端子 ７ 増幅器の入力端子 １４ シールド配線路 ９ 金属ケース １１ 電圧フォロワ回路 １２ 電圧フォロワ回路の入力端子 １３ 電圧フォロワ回路の出力端子REFERENCE SIGNS LIST 1 light receiving element 2 amplifier 3 printed circuit board 4, 10 integrated circuit 5 1 electrode of light receiving element 5 2 input wiring path 6 1 input terminal of integrated circuit 7 input terminal of amplifier 14 shield wiring path 9 metal case 11 voltage follower circuit 12 voltage follower Input terminal of circuit 13 Output terminal of voltage follower circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｂ 10/26 10/28 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI H04B 10/26 10/28
Claims (2)
と、 前記受光手段で得られた電気信号を増幅する集積化され
た増幅手段と、 前記増幅手段の入力端子に接続されている配線路を包囲
してシールドするシールド配線路と、 前記増幅手段と同一基板上に集積化され、入力端子が前
記増幅手段の入力端子に接続され、出力端子が前記シー
ルド配線路に接続されて、前記増幅手段の入力電圧と同
等の電圧を前記シールド配線路に供給する電圧フォロワ
手段とを有することを特徴とする光受信器。1. A light receiving means for receiving incident light and performing photoelectric conversion, an integrated amplifying means for amplifying an electric signal obtained by the light receiving means, and a wiring path connected to an input terminal of the amplifying means A shield wiring path surrounding and shielding the amplifier, the amplifier is integrated on the same substrate, an input terminal is connected to an input terminal of the amplifier, an output terminal is connected to the shield wiring, and the amplification is performed. Voltage follower means for supplying a voltage equivalent to the input voltage of the means to the shield wiring path.
フォロワ手段は、多層基板に実装されて、前記増幅手段
の入力端子に接続されている配線路が横方向及び上下方
向にシールドされてなることを特徴とする請求項１記載
の光受信器。2. The amplifying means, the shield wiring path and the voltage follower means are mounted on a multilayer substrate, and the wiring path connected to the input terminal of the amplifying means is shielded in a horizontal direction and a vertical direction. The optical receiver according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03328924A JP3103175B2 (en) | 1991-12-12 | 1991-12-12 | Optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03328924A JP3103175B2 (en) | 1991-12-12 | 1991-12-12 | Optical receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05167357A JPH05167357A (en) | 1993-07-02 |
| JP3103175B2 true JP3103175B2 (en) | 2000-10-23 |
Family
ID=18215620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03328924A Expired - Fee Related JP3103175B2 (en) | 1991-12-12 | 1991-12-12 | Optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3103175B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7534981B2 (en) | 2006-08-30 | 2009-05-19 | Panasonic Corporation | Optical semiconductor device having a shield wire and optical pickup device having a shield wire |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000076325A (en) | 1997-03-19 | 2000-12-26 | 타테이시 요시오 | Transmitting photoelectric sensor array |
| CN2745144Y (en) * | 2004-11-18 | 2005-12-07 | 佛山市国星光电科技有限公司 | Infrared receiver |
| JP2019036715A (en) * | 2017-08-10 | 2019-03-07 | 株式会社リコー | Measuring apparatus |
-
1991
- 1991-12-12 JP JP03328924A patent/JP3103175B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7534981B2 (en) | 2006-08-30 | 2009-05-19 | Panasonic Corporation | Optical semiconductor device having a shield wire and optical pickup device having a shield wire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05167357A (en) | 1993-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1776783B1 (en) | Transimpedance amplifier with integrated filtering and reduced parasitic capacitance | |
| US20030025824A1 (en) | Image pickup device incorporating a position defining member | |
| US20010013573A1 (en) | Photosensor-amplifier device | |
| JP3103175B2 (en) | Optical receiver | |
| US20130342275A1 (en) | Transimpedance amplifier | |
| GB2165117A (en) | Optical receiver | |
| US20070297809A1 (en) | Optical Transmission/Reception Equipment And Optical Transmission/Reception Module | |
| US4139767A (en) | Photodetector with improved signal-to-noise ratio | |
| US20020085126A1 (en) | Digital broadcasting reception unit | |
| US3368150A (en) | Construction for radios and the like | |
| EP0486021B1 (en) | Optical receiver | |
| EP0525807A2 (en) | Opto-electronic integrated circuit | |
| KR100472133B1 (en) | A video signal driver including a cascode transistor | |
| US6903326B2 (en) | OPTO-electronic assembly having detectors for converting optical signals | |
| JP3778795B2 (en) | Electrical equipment with light receiving unit | |
| US4769714A (en) | Noise and arc suppression filter for a display driver stage | |
| JPH04252624A (en) | Optical receiver | |
| JPS61218180A (en) | Light receiving device | |
| JPH0485885A (en) | Photocoupler | |
| JP2658950B2 (en) | Receiver circuit for optical analog transmission | |
| JPH06291529A (en) | Glass antenna for vehicle | |
| CA1101515A (en) | Photodetector with improved signal-to-noise ratio | |
| JPH03218125A (en) | Signal output device | |
| JPH06164253A (en) | Light receiving circuit | |
| JPH02263123A (en) | Light receiving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070825 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080825 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090825 Year of fee payment: 9 |
|
| LAPS | Cancellation because of no payment of annual fees |