CN204145419U - High-speed-differential photodetector system - Google Patents
High-speed-differential photodetector system Download PDFInfo
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- CN204145419U CN204145419U CN201420541112.3U CN201420541112U CN204145419U CN 204145419 U CN204145419 U CN 204145419U CN 201420541112 U CN201420541112 U CN 201420541112U CN 204145419 U CN204145419 U CN 204145419U
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Abstract
The utility model discloses a kind of high-speed-differential photodetector system, by power module, light-electric modular converter, pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit, described power module is connected with light-electric modular converter, pre-amplification circuit, rear class voltage amplifier circuit, and described light-electric modular converter connects pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit successively.The utility model is by making photodiode work under reverse-biased, and make the input resistance of pre-amplification circuit close to short-circuit condition, the advance signal amplifier section exported at photodiode first realizes voltage amplification with across resistance type amplifier, whole testing circuit is only with 2 grades of amplifications, simple possible, reduce costs, and be conducive to noise decrease impact.
Description
Technical field
The present invention relates to photoelectric detection technology field, particularly relate to a kind of high-speed-differential photodetector system being applicable to continuous variable quantum key distribution and joining experiment.
Background technology
Photoelectric detecting technology is a kind of new and high technology of non-cpntact measurement, traditional optical technology is combined with modern electronic technology, the important means obtaining optical information or extract other information by means of light. Photoelectric Detection is exactly the useful signal demodulation be modulated on light carrier out, realizes the conversion of light signal to the signal of telecommunication.
An application of Photoelectric Detection is exactly the signal receiver as continuous variable quantum key distribution system, continuous variable quantum-key distribution experiment in adopt faint light pulse replace single photon pulses as information carrier. faint optical signal at transmit leg through ovennodulation, in channel, arrive recipient, homodyne coherent detection technology is utilized recipient, flashlight and local oscillator light are carried out mixing, the 2 road light signals exported utilize difference photoelectric detective circuit to carry out opto-electronic conversion, the difference information of light signal is converted to the voltage signal be directly proportional to power, carry out follow-up Signal acquiring and processing.
Summary of the invention
For the deficiency that prior art exists, object of the present invention just there are provided a kind of high-speed-differential photodetector system, make photodiode work under reverse-biased, and make the input resistance of pre-amplification circuit close to short-circuit condition, photodiode export advance signal amplifier section first realize voltage amplification with across resistance type amplifier, whole testing circuit only with 2 grades of amplifications, simple possible, reduce costs, and be conducive to noise decrease impact.
To achieve these goals, the technical solution used in the present invention is such: a kind of high-speed-differential photodetector system, by power module, light-electric modular converter, pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit, described power module is connected with light-electric modular converter, pre-amplification circuit, rear class voltage amplifier circuit, and described light-electric modular converter connects pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit successively.
As a kind of preferred version, described power module comprises a DC/DC transducer DC5D12, 2nd DC/DC transducer DC5S12, a described DC/DC transducer DC5D12 is that 5 ~ ± 12V changes, wherein a DC/DC transducer DC5D12 exports the VDD of+12V, the VDD-of-12V is that light-electric modular converter is powered, the VDD of the one DC/DC transducer DC5D12 is converted to the VCC of 5V by 7805 voltage stabilizing chips, 2nd DC/DC transducer DC5S12 is 5 ~ 12V conversion, wherein the 2nd DC/DC transducer DC5S12 exports the VEE of 12V, the VEE-of 5V is that rear class voltage amplifier circuit is powered.
As a kind of preferred version, described light-electric modular converter input connects power module respectively, and output connects pre-amplification circuit; The model that first photodiode D1 of described light-electric modular converter, the second photodiode D2 adopt is BPX65.
Circuit application 2 photodiodes realize differential driving, 2 photodiode work are under the reversed bias voltage of 12V, mode of operation is guided optical mode, higher bias voltage is conducive to the junction capacitance reducing photodiode, improve the response speed of photodiode, and the junction capacitance of photodiode BPX65 under the reverse bias voltage of 12V is 2.5pF.
As a kind of preferred version, described pre-amplification circuit adopts the model across resistance type amplifier U1 to be SA5212, and output, 2 pin of described 1 pin connection light-electric modular converter across resistance type amplifier U1 connect power modules, 3 pin ground connection, 4 pin ground connection, 6 pin ground connection, 8 pin ground connection, 5 pin are connected intermediate filter circuit input with 7 pin.
As a kind of preferred version, the filter that described intermediate filter circuit adopts is passive three rank Butterworth filters.
As a kind of preferred version, described rear class voltage amplifier circuit adopts wide-band amplify chip UA733.
Compared with prior art, beneficial effect of the present invention: difference photodetector system of the present invention, make photodiode work under reverse-biased, and make the input resistance of pre-amplification circuit close to short-circuit condition, photodiode export advance signal amplifier section first realize voltage amplification with across resistance type amplifier, whole testing circuit only with 2 grades of amplifications, simple possible, reduce costs, and be conducive to noise decrease impact.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit theory diagrams of power module in the present invention;
Fig. 3 is the circuit theory diagrams of light in the present invention-electric modular converter;
Fig. 4 is the circuit theory diagrams of pre-amplification circuit in the present invention;
Fig. 5 is the circuit theory diagrams of intermediate filter circuit in the present invention;
Fig. 6 is the circuit theory diagrams of rear class voltage amplifier circuit in the present invention.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment:
As shown in Figure 1, a kind of high-speed-differential photodetector system, by power module 1, light-electric modular converter 2, pre-amplification circuit 3, intermediate filter circuit 4 and rear class voltage amplifier circuit 5, described power module 1 is connected with light-electric modular converter 2, pre-amplification circuit 3, rear class voltage amplifier circuit 5, and described light-electric modular converter 2 connects pre-amplification circuit 3, intermediate filter circuit 4 and rear class voltage amplifier circuit 5 successively.
Wherein the circuit theory diagrams of power module 1 as shown in Figure 2, described power module 1 comprises a DC/DC transducer DC5D12, 2nd DC/DC transducer DC5S12, a described DC/DC transducer DC5D12 is that 5 ~ ± 12V changes, wherein a DC/DC transducer DC5D12 exports the VDD of+12V, the VDD-of-12V is that light-electric modular converter 2 is powered, the VDD of the one DC/DC transducer DC5D12 is converted to the VCC of 5V by 7805 voltage stabilizing chips, 2nd DC/DC transducer DC5S12 is 5 ~ 12V conversion, wherein the 2nd DC/DC transducer DC5S12 exports the VEE of 12V, the VEE-of 5V is that rear class voltage amplifier circuit 5 is powered.
As shown in Figure 3, described light-electric modular converter 2 input connects power module 1 to the circuit theory diagrams of wherein light-electric modular converter 2 respectively, and output connects pre-amplification circuit 3; The model that first photodiode D1 of described light-electric modular converter 2, the second photodiode D2 adopt is BPX65.
Wherein the circuit theory diagrams of pre-amplification circuit 3 as shown in Figure 4, described pre-amplification circuit 3 adopts the model across resistance type amplifier U1 to be SA5212, and output, 2 pin of described 1 pin connection light-electric modular converter 2 across resistance type amplifier U1 connect power module 1,3 pin ground connection, 4 pin ground connection, 6 pin ground connection, 8 pin ground connection, 5 pin are connected intermediate filter circuit 4 input with 7 pin.
Wherein the circuit theory diagrams of intermediate filter circuit 4 as shown in Figure 4, and the filter that described intermediate filter circuit 4 adopts is passive three rank Butterworth filters.
Wherein the circuit theory diagrams of rear class voltage amplifier circuit 5 as shown in Figure 4, and described rear class voltage amplifier circuit 5 adopts wide-band amplify chip UA733.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and non-limiting technical scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (6)
1. a high-speed-differential photodetector system, it is characterized in that: described system is by power module, light-electric modular converter, pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit, described power module is connected with light-electric modular converter, pre-amplification circuit, rear class voltage amplifier circuit, and described light-electric modular converter connects pre-amplification circuit, intermediate filter circuit and rear class voltage amplifier circuit successively.
2. a kind of high-speed-differential photodetector system according to claim 1, it is characterized in that: described power module comprises a DC/DC transducer DC5D12, 2nd DC/DC transducer DC5S12, a described DC/DC transducer DC5D12 is that 5 ~ ± 12V changes, wherein a DC/DC transducer DC5D12 exports the VDD of+12V, the VDD-of-12V is that light-electric modular converter is powered, the VDD of the one DC/DC transducer DC5D12 is converted to the VCC of 5V by 7805 voltage stabilizing chips, 2nd DC/DC transducer DC5S12 is 5 ~ 12V conversion, wherein the 2nd DC/DC transducer DC5S12 exports the VEE of 12V, the VEE-of 5V is that rear class voltage amplifier circuit is powered.
3. a kind of high-speed-differential photodetector system according to claim 1, is characterized in that: described light-electric modular converter input connects power module respectively, and output connects pre-amplification circuit; The model that first photodiode D1 of described light-electric modular converter, the second photodiode D2 adopt is BPX65.
4. a kind of high-speed-differential photodetector system according to claim 1, it is characterized in that: described pre-amplification circuit adopts the model across resistance type amplifier U1 to be SA5212, output, 2 pin of described 1 pin connection light-electric modular converter across resistance type amplifier U1 connect power modules, 3 pin ground connection, 4 pin ground connection, 6 pin ground connection, 8 pin ground connection, 5 pin are connected intermediate filter circuit input with 7 pin.
5. a kind of high-speed-differential photodetector system according to claim 1, is characterized in that: the filter that described intermediate filter circuit adopts is passive three rank Butterworth filters.
6. a kind of high-speed-differential photodetector system according to claim 1, is characterized in that: described rear class voltage amplifier circuit adopts wide-band amplify chip UA733.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420541112.3U CN204145419U (en) | 2014-09-22 | 2014-09-22 | High-speed-differential photodetector system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420541112.3U CN204145419U (en) | 2014-09-22 | 2014-09-22 | High-speed-differential photodetector system |
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| Publication Number | Publication Date |
|---|---|
| CN204145419U true CN204145419U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420541112.3U Active CN204145419U (en) | 2014-09-22 | 2014-09-22 | High-speed-differential photodetector system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300922A (en) * | 2014-09-22 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | High-speed differential photoelectrical detecting system |
| CN112994633A (en) * | 2021-02-25 | 2021-06-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Photoelectric induction circuit and device for wind tunnel ballistic target free flight model detection |
-
2014
- 2014-09-22 CN CN201420541112.3U patent/CN204145419U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300922A (en) * | 2014-09-22 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | High-speed differential photoelectrical detecting system |
| CN112994633A (en) * | 2021-02-25 | 2021-06-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Photoelectric induction circuit and device for wind tunnel ballistic target free flight model detection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214500, No. 2, Jianan Road, Jingjiang, Jiangsu, Taizhou Patentee after: Jiangsu Chun long photoelectric Polytron Technologies Inc Address before: 214500, No. 2, Jianan Road, Jingjiang, Jiangsu, Taizhou Patentee before: Jiangsu Junlong Electric Power Technology Co., Ltd. |