JPS62123811A - Optical reception circuit - Google Patents
Optical reception circuitInfo
- Publication number
- JPS62123811A JPS62123811A JP60264352A JP26435285A JPS62123811A JP S62123811 A JPS62123811 A JP S62123811A JP 60264352 A JP60264352 A JP 60264352A JP 26435285 A JP26435285 A JP 26435285A JP S62123811 A JPS62123811 A JP S62123811A
- Authority
- JP
- Japan
- Prior art keywords
- differential amplifier
- photodiode
- bias power
- input terminal
- power supply
- 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
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光受信回路に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical receiving circuit.
従来、この種の光受信回路は第２図に示すように、差動
増幅器ｌと、フォトダイオード２と、差動増幅器１のＤ
Ｃ動作点を定めるために差動増幅器１の入力端子にＤＣ
バイアスを印加する固定バイアス回路３，４とから構成
されていた。Conventionally, this type of optical receiving circuit has a differential amplifier l, a photodiode 2, and a differential amplifier D, as shown in FIG.
DC to the input terminal of differential amplifier 1 to determine the C operating point.
It consisted of fixed bias circuits 3 and 4 that apply bias.
上述した従来の光受信回路においては、フォトダイオー
ド２により光−電気変換された受信信号は差動増幅器１
に入力され、増幅される。しかし、フォトダイオード２
のバイアス電源端子７に雑音が重畳された場合、この雑
音電圧がフォトダイオード２を介して差動増幅器１に入
力されるため、受信信号の信号対雑音比が劣化するとい
う欠点がある。In the conventional optical receiving circuit described above, the received signal that has been optical-to-electrically converted by the photodiode 2 is sent to the differential amplifier 1.
input and amplified. However, photodiode 2
When noise is superimposed on the bias power supply terminal 7, this noise voltage is input to the differential amplifier 1 via the photodiode 2, which has the disadvantage that the signal-to-noise ratio of the received signal deteriorates.
本発明の光受信回路は、受信光信号を光−電気変換する
フォトダイオードと、フォトダイオードの出力信号を増
幅する差動増幅器とから構成され、差動増幅器の一方の
入力端子にはフォトダイオードが接続され、上記入力端
子とフォトダイオードのバイアス電源の間のインピーダ
ンスに等しいインピーダンスを持つ回路が、差動増幅器
の他方の入力端子とフォトダイオードのバイアス電源と
の間に接続されている。The optical receiver circuit of the present invention is composed of a photodiode that performs optical-to-electrical conversion of a received optical signal, and a differential amplifier that amplifies the output signal of the photodiode, and the photodiode is connected to one input terminal of the differential amplifier. A circuit having an impedance equal to the impedance between the input terminal and the photodiode bias power supply is connected between the other input terminal of the differential amplifier and the photodiode bias power supply.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
この実施例では、差動増幅器１の一方の入力端子には受
信光信号を光−電気変換するためのフォトダイオード２
が接続され、他方の入力端子にはフォトダイオード２の
バイアス電源との間ＫＩＯＭΩの抵抗器５と３９Ｆのコ
ンデンサ６の並列回路が接続されている。この回路では
、７ｔトダイオード２のバイアス電源端子７と差動増幅
器１の一対の入力端子間の交流インピーダンスが等しく
なっている。この結果、差動増幅器１の同相信号除去比
が２０ｄＢ改善された。In this embodiment, one input terminal of the differential amplifier 1 has a photodiode 2 for optical-to-electrical conversion of the received optical signal.
is connected to the other input terminal, and a parallel circuit of a KIOMΩ resistor 5 and a 39F capacitor 6 is connected between the bias power source of the photodiode 2 and the other input terminal. In this circuit, the AC impedance between the bias power supply terminal 7 of the 7t diode 2 and the pair of input terminals of the differential amplifier 1 is equal. As a result, the common mode signal rejection ratio of the differential amplifier 1 was improved by 20 dB.
〔発明の効果〕
以上説明したように本発明は、フォトダイオードのバイ
アス電源と差動増幅器の一対の入力端子との間のインピ
ーダンスを等しくすることができるため、差動槽ｍＷの
同相信号除去比を向上させることができる。その結果、
フォトダイオードのバイアス電源に雑音が混入しても、
受信感度が大きく低下することを防止できるという効果
がある。[Effects of the Invention] As explained above, the present invention makes it possible to equalize the impedance between the bias power supply of the photodiode and the pair of input terminals of the differential amplifier. ratio can be improved. the result,
Even if noise enters the photodiode bias power supply,
This has the effect of preventing a large drop in reception sensitivity.
第１図は本発明の実施例を示す回路図、第２図は従来の
光受信回路を示す回路図である。
１・・・・・・差動増幅器、２・・・・・・フォトダイ
オード、３．４・・・・・・固定バイアス回路、５・・
・・・・抵抗器、６・・・・・・コンデンサ、７・・・
・・・バイアス電源端子。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional optical receiving circuit. 1...Differential amplifier, 2...Photodiode, 3.4...Fixed bias circuit, 5...
...Resistor, 6...Capacitor, 7...
...Bias power supply terminal.
Claims (1)
フォトダイオードの出力信号を増幅する差動増幅器とを
含む光受信回路において、 前記差動増幅器の一方の入力端子に前記フォトダイオー
ドが接続されると共に前記入力端子と前記フォトダイオ
ードのバイアス電源との間のインピーダンスに等しいイ
ンピーダンスを有する回路が、前記差動増幅器の他方の
入力端子と前記フォトダイオードのバイアス電源との間
に接続されていることを特徴とする光受信回路。[Scope of Claims] An optical receiving circuit including a photodiode that photoelectrically converts a received optical signal, and a differential amplifier that amplifies an output signal of the photodiode, wherein one input terminal of the differential amplifier is connected to the photodiode. A circuit to which the diode is connected and having an impedance equal to the impedance between the input terminal and the bias power supply for the photodiode is connected between the other input terminal of the differential amplifier and the bias power supply for the photodiode. An optical receiving circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264352A JPS62123811A (en) | 1985-11-22 | 1985-11-22 | Optical reception circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264352A JPS62123811A (en) | 1985-11-22 | 1985-11-22 | Optical reception circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62123811A true JPS62123811A (en) | 1987-06-05 |
Family
ID=17401959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60264352A Pending JPS62123811A (en) | 1985-11-22 | 1985-11-22 | Optical reception circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62123811A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0376440A (en) * | 1989-08-18 | 1991-04-02 | Nec Corp | Optical receiver |
| JP2014192895A (en) * | 2013-03-26 | 2014-10-06 | Excelitas Canada Inc | DIFFERENTIAL OPTICAL RECEIVER FOR AVALANCHE PHOTODIODE AND SiPM |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6242603A (en) * | 1985-08-20 | 1987-02-24 | Seiko Epson Corp | Operational amplifier circuit for photosensor |
-
1985
- 1985-11-22 JP JP60264352A patent/JPS62123811A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6242603A (en) * | 1985-08-20 | 1987-02-24 | Seiko Epson Corp | Operational amplifier circuit for photosensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0376440A (en) * | 1989-08-18 | 1991-04-02 | Nec Corp | Optical receiver |
| JP2014192895A (en) * | 2013-03-26 | 2014-10-06 | Excelitas Canada Inc | DIFFERENTIAL OPTICAL RECEIVER FOR AVALANCHE PHOTODIODE AND SiPM |
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