JPH0471187U - - Google Patents
Info
- Publication number
- JPH0471187U JPH0471187U JP11465190U JP11465190U JPH0471187U JP H0471187 U JPH0471187 U JP H0471187U JP 11465190 U JP11465190 U JP 11465190U JP 11465190 U JP11465190 U JP 11465190U JP H0471187 U JPH0471187 U JP H0471187U
- Authority
- JP
- Japan
- Prior art keywords
- avalanche photodiode
- current
- signal
- noise
- bias voltage
- 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
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
Description
第１図はこの考案による光受信回路の一実施例
の構成を示す図、第２図はこの考案による光受信
回路の他の実施例の構成を示す図、第３図は従来
の光受信回路の構成を示す図である。
図において、１は直流電源、２はアバランシエ
・フオトダイオード、３は受信光、４は増幅器、
５は基準電源、６は比較器、７は直流電源、８は
バイアス制御信号、９は雑音電流検出回路、１０
はバイアス電圧制御回路、１１はタイミング発生
回路、１２は温度検出器。なお、図中、同一符号
は同一又は相当部分を示す。
FIG. 1 is a diagram showing the configuration of one embodiment of the optical receiving circuit according to this invention, FIG. 2 is a diagram showing the construction of another embodiment of the optical receiving circuit according to this invention, and FIG. 3 is a diagram showing the configuration of a conventional optical receiving circuit. FIG. In the figure, 1 is a DC power supply, 2 is an avalanche photodiode, 3 is a receiving light, 4 is an amplifier,
5 is a reference power supply, 6 is a comparator, 7 is a DC power supply, 8 is a bias control signal, 9 is a noise current detection circuit, 10
1 is a bias voltage control circuit, 11 is a timing generation circuit, and 12 is a temperature detector. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
トダイオードと、このアバランシエ・フオトダイ
オードにバイアス電圧を印加するとともに、この
バイアス電圧をバイアス制御信号により可変でき
る直流電源と、前記アバランシエ・フオトダイオ
ードに入射した背景光及び前記アバランシエ・フ
オトダイオードの暗電流によつて生じる前記アバ
ランシエ・フオトダイオードからの出力電流を検
出する雑音電流検出回路と、前記アバランシエ・
フオトダイオードからの雑音電流が受信信号光を
検出するタイミングでは所定の値となるように前
記アバランシエ・フオトダイオードのバイアス電
圧を制御して、前記アバランシエ・フオトダイオ
ードの増倍率を制御するように前記直流電源へバ
イアス制御信号を出力するバイアス電圧制御回路
と受信信号光を検出するタイミング信号とこのタ
イミングの前に背景光及びアバランシエ・フオト
ダイオードの暗電流によつて生じる前記アバラン
シエ・フオトダイオードからの雑音電流を所定の
値に設定するタイミング信号を発生し、バイアス
電圧制御回路へ出力するタイミング信号発生回路
と前記アバランシエ・フオトダイオードからの出
力電流を電圧信号に交換して増幅する増幅器と、
基準電圧を発生する基準電源と、この基準電源の
出力電圧と前記増幅器からの出力信号電圧との差
を２値信号に変換する比較器とを備えた光受信回
路。 (2) 前記バイアス制御回路は前記アバランシエ
・フオトダイオードからの雑音電流の設定値を、
受信信号の信号対雑音比が実質的に最適値となる
前記アバランシエ・フオトダイオードの増倍率が
得られるバイアス電圧を、前記アバランシエ・フ
オトダイオードに印加した場合に発生する前記ア
バランシエ・フオトダイオードからの雑音電流値
としたことを特徴とする実用新案登録請求の範囲
第(1)項記載の光受信回路。 (3) 前記バイアス制御回路は前記アバランシエ
・フオトダイオードからの雑音電流の設定値を、
実質的に次式により求められる値としたことを特
徴とする実用新案登録請求の範囲第(1)項記載の
光受信回路。ｉｎ＝（４ｋＴＦｅＸＲＬ）１２＋
Ｘ（ｉｎｏＭｏ）１＋Ｘ２＋Ｘここでｉｎは前記
アバランシエ・フオトダイオードからの雑音電流
、ｅは電荷、Ｘは前記アバランシエ・フオトダイ
オードの過剰雑音指数、Ｒ１は増幅器の入力抵抗
、Ｒはボルツマン定数、Ｔは増幅器の温度、Ｆは
増幅器の雑音指数、ｉｎｏは前記雑音電流を設定
する前に前記アバランシエ・フオトダイオードの
増倍率をＭｏに設定して検出したときの前記アバ
ランシエ・フオトダイオードの雑音電流値である
。 (4) 前記バイアス電圧制御回路は、前記増幅器
の温度変化に対応して、前記アバランシエ・フオ
トダイオードからの雑音電流の設定値を変化させ
るようにしたことを特徴とする実用新案登録請求
の範囲第(1)項記載の光受信回路。[Claims for Utility Model Registration] (1) An avalanche photodiode that photoelectrically converts received light, a DC power supply that applies a bias voltage to the avalanche photodiode and can vary this bias voltage using a bias control signal; a noise current detection circuit for detecting an output current from the avalanche photodiode caused by background light incident on the avalanche photodiode and dark current of the avalanche photodiode;
The bias voltage of the avalanche photodiode is controlled so that the noise current from the photodiode reaches a predetermined value at the timing of detecting the received signal light, and the direct current is controlled to control the multiplication factor of the avalanche photodiode. A bias voltage control circuit that outputs a bias control signal to the power supply, a timing signal that detects the received signal light, and a noise current from the avalanche photodiode caused by background light and dark current of the avalanche photodiode before this timing. a timing signal generation circuit that generates a timing signal for setting the avalanche photodiode to a predetermined value and outputs it to the bias voltage control circuit; and an amplifier that converts the output current from the avalanche photodiode into a voltage signal and amplifies it;
An optical receiving circuit comprising a reference power source that generates a reference voltage, and a comparator that converts the difference between the output voltage of the reference power source and the output signal voltage from the amplifier into a binary signal. (2) The bias control circuit controls the set value of the noise current from the avalanche photodiode to
Noise from the avalanche photodiode that occurs when a bias voltage is applied to the avalanche photodiode to obtain a multiplication factor of the avalanche photodiode at which the signal-to-noise ratio of the received signal is substantially optimal. The optical receiving circuit according to claim (1) of the utility model registration, characterized in that the current value is a current value. (3) The bias control circuit controls the set value of the noise current from the avalanche photodiode to
The optical receiving circuit according to claim (1) of the utility model registration claim, characterized in that the value is substantially determined by the following formula. in=(4kTFeXRL)12+
X (inoMo) 1 + X 2 + The temperature of the amplifier, F is the noise figure of the amplifier, and ino is the noise current value of the avalanche photodiode when detected by setting the multiplication factor of the avalanche photodiode to Mo before setting the noise current. . (4) The bias voltage control circuit is configured to change a set value of the noise current from the avalanche photodiode in response to a temperature change of the amplifier. The optical receiving circuit described in (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11465190U JPH0471187U (en) | 1990-10-31 | 1990-10-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11465190U JPH0471187U (en) | 1990-10-31 | 1990-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0471187U true JPH0471187U (en) | 1992-06-24 |
Family
ID=31862357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11465190U Pending JPH0471187U (en) | 1990-10-31 | 1990-10-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0471187U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286669A (en) * | 2007-05-18 | 2008-11-27 | Sokkia Topcon Co Ltd | Light wave range finder |
| WO2019065490A1 (en) * | 2017-09-26 | 2019-04-04 | パイオニア株式会社 | Control device, detection device, method for controlling avalanche diode, program and storage medium |
| WO2022059397A1 (en) * | 2020-09-15 | 2022-03-24 | ソニーセミコンダクタソリューションズ株式会社 | Ranging system and light detection device |
-
1990
- 1990-10-31 JP JP11465190U patent/JPH0471187U/ja active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286669A (en) * | 2007-05-18 | 2008-11-27 | Sokkia Topcon Co Ltd | Light wave range finder |
| WO2019065490A1 (en) * | 2017-09-26 | 2019-04-04 | パイオニア株式会社 | Control device, detection device, method for controlling avalanche diode, program and storage medium |
| JPWO2019065490A1 (en) * | 2017-09-26 | 2020-11-05 | パイオニア株式会社 | Controls, detectors, methods for controlling avalanche diodes, programs and storage media |
| JP2022091847A (en) * | 2017-09-26 | 2022-06-21 | パイオニア株式会社 | Control device, detection device, method for controlling avalanche diode, program, and storage media |
| WO2022059397A1 (en) * | 2020-09-15 | 2022-03-24 | ソニーセミコンダクタソリューションズ株式会社 | Ranging system and light detection device |
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