CN2203514Y - Light receiver - Google Patents
Light receiver Download PDFInfo
- Publication number
- CN2203514Y CN2203514Y CN94204057U CN94204057U CN2203514Y CN 2203514 Y CN2203514 Y CN 2203514Y CN 94204057 U CN94204057 U CN 94204057U CN 94204057 U CN94204057 U CN 94204057U CN 2203514 Y CN2203514 Y CN 2203514Y
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- CN
- China
- Prior art keywords
- preamplifier
- input impedance
- optical receiver
- amplifier
- resistance
- 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
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- Optical Communication System (AREA)
- Amplifiers (AREA)
Abstract
The utility model discloses a light receiver, which is composed of a photosensitive circuit, a preamplifier, and a buffer amplifier, wherein, the input end of the amplifier is connected with a variable input impedance controlled by a feedback control circuit connected with the output end of the amplifier. The utility model widens dynamic working range of the light receiver as well as keeps higher sensitivity of light reception.
Description
The utility model relates to a kind of optical receiver that is connected to form by photosensitive circuit, preamplifier and buffer amplifier, particularly a kind of this class optical receiver with wide dynamic duty scope.
In the middle of the design of the existing optical receiver that connects to form by photosensitive circuit, preamplifier and buffer amplifier, in order to adapt to the variation of optical transmission distance and signal power, widen the dynamic duty scope of optical receiver, adopted preamplifier with automatic gain control circuit.Yet this class automatic gain control circuit of prior art is the input that is directly fed back to it by the output of amplifier, has so just introduced feedback distributed capacitance in parallel for amplifier simultaneously, and it descends the operating frequency of amplifier significantly.In order to obtain identical frequency band, feedback resistance that just can only step-down amplifier reduces gain, thereby causes the sensitivity of optical receiver to descend.
The purpose of this utility model is for overcoming the above-mentioned defective of prior art, when widening the dynamic duty scope of optical receiver, still seeks to maintain higher optical receiver sensitivity.
Realize that the technical measures that the utility model purpose is taked are, in optical receiver, input at the preamplifier that is connected to feedback resistance is connected to a variable input impedance, is connected to the control circuit of an input impedance change between the output of the control end of variable input impedance and preamplifier.The feedback control circuit that the utility model adopted can change the input pressure drop that photosensitive electric current produces by the input impedance that changes amplifier, realizes widening the purpose of the dynamic duty scope of optical receiver with this.Owing to only increase the input capacitance of amplifier at the distributed capacitance of the variable input impedance of the input of reception amplifier, the influence of the frequency characteristic of its pair amplifier is very little, therefore can exempt when the distributed capacitance of control circuit directly being access to the caused pair amplifier frequency characteristic of input by the output of amplifier and to the appreciable impact of optical receiver sensitivity.
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
Accompanying drawing is the circuit diagram of an embodiment of the utility model optical receiver.Wherein photosensitive circuit (1) is to form with the pin photodiode (2) of reverse biased, and preamplifier (3) is a low noise mutual impedance preamplifier that comprises GaAs field-effect transistor Q1.Form buffer amplifier (4) by N-P-N transistor Q6, and by the output (5) of its emitter as optical receiver.Be connected by feedback resistance R1 between the output (6) and input (7) of amplifier (3).This embodiment does variable input impedance (8) with N-P-N transistor Q5, makes its emitter be connected to the input (7) of amplifier (3), and collector electrode is connected to reference voltage+Vcc, and base stage is as the control end (9) of variable input impedance (8).Form the control circuit (10) of variable input impedance (8) by P-N-P transistor Q4, resistance R 2 and capacitor C 1, the emitter of Q4 and each end of resistance R 2 and capacitor C 1 are linked together.The other end of the base stage of Q4 and resistance R 2 is connected to reference voltage+Vcc, and the collector electrode of Q4 is connected to the control end (9) of variable input impedance (8), and the other end of capacitor C 1 is connected to the output (6) of amplifier (3).When the light signal enhancing, the input impedance that the transistor Q5 that controlled by feedback control circuit (10) is presented reduces, thereby the photovoltage that photoelectric current is produced descends, otherwise then makes the photovoltage increase, realizes widening the dynamic duty scope of optical receiver with this.
Claims (5)
1, a kind of optical receiver that connects to form by photosensitive circuit, preamplifier and buffer amplifier, it is characterized in that, input at the described preamplifier that is connected to feedback resistance is connected to a variable input impedance, is connected to the control circuit of an input impedance change between the output of the control end of variable input impedance and described preamplifier.
2, according to the described optical receiver of claim 1, it is characterized by, the variable input impedance that connects at the input of described preamplifier is a N-P-N transistor, its emitter is connected to the input of described preamplifier, its collector electrode is connected to reference voltage, and base stage is as the control end of variable input impedance.
3, according to the described optical receiver of claim 1, it is characterized by, the control circuit of a described control input impedance change is made up of a P-N-P transistor, a resistance and an electric capacity, each end of the transistorized emitter of P-N-P and resistance and electric capacity links together, the other end of transistorized base stage of P-N-P and resistance is connected to reference voltage, the transistorized collector electrode of P-N-P is connected to the control end of described variable input impedance, and the other end of electric capacity is connected to the output of described preamplifier.
4, according to the described optical receiver of claim 1, it is characterized by, described photosensitive circuit is made up of a back-biased pin photodiode.
5, according to the described optical receiver of claim 1, it is characterized by, described preamplifier is a low noise mutual impedance preamplifier that comprises the GaAs field-effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94204057U CN2203514Y (en) | 1994-03-02 | 1994-03-02 | Light receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94204057U CN2203514Y (en) | 1994-03-02 | 1994-03-02 | Light receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2203514Y true CN2203514Y (en) | 1995-07-12 |
Family
ID=33823404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94204057U Expired - Fee Related CN2203514Y (en) | 1994-03-02 | 1994-03-02 | Light receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2203514Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370529C (en) * | 2004-07-16 | 2008-02-20 | 夏普株式会社 | Photo-receiving amplifier element, optical pickup unit, and optical disk device |
| WO2010096064A1 (en) | 2009-02-23 | 2010-08-26 | Hewlett-Packard Development Company, L.P. | Dynamic impedance photodetector receiver circuit |
-
1994
- 1994-03-02 CN CN94204057U patent/CN2203514Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370529C (en) * | 2004-07-16 | 2008-02-20 | 夏普株式会社 | Photo-receiving amplifier element, optical pickup unit, and optical disk device |
| WO2010096064A1 (en) | 2009-02-23 | 2010-08-26 | Hewlett-Packard Development Company, L.P. | Dynamic impedance photodetector receiver circuit |
| CN102362449B (en) * | 2009-02-23 | 2015-09-09 | 惠普开发有限公司 | dynamic impedance photodetector receiver circuit |
| EP2399350A4 (en) * | 2009-02-23 | 2016-06-15 | Hewlett Packard Development Co | Dynamic impedance photodetector receiver circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |