CN109639343A - A kind of modular optical photo-detector arrangement - Google Patents
A kind of modular optical photo-detector arrangement Download PDFInfo
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- CN109639343A CN109639343A CN201811488641.0A CN201811488641A CN109639343A CN 109639343 A CN109639343 A CN 109639343A CN 201811488641 A CN201811488641 A CN 201811488641A CN 109639343 A CN109639343 A CN 109639343A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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Abstract
The present invention discloses a kind of modular optical photo-detector arrangement, including measured signal unit, APD module, current amplifier module, power module, voltage amplification module, output signal unit；The output port of measured signal unit is connect with the input port of APD module, the output port of APD module is connect with current amplifier module, power module is connect with current amplifier module and the one of input port of voltage amplification module respectively, one of output port of current amplifier module is connect with one of input port of voltage amplification module, the output port of voltage amplification module is connect with the input terminal of output signal unit, and six modules are carried out integration and are placed in the electromagnetic shielding box of aluminium material.
Description
Technical field
The present invention relates to photo-detector circuit, in particular to a kind of high-precision modular optical photo-detector arrangement.
Background technique
In recent years with the progress of the communication technology, the reform of telecommunication administration system and opening gradually for telecommunication market, light
Fiber communication shows again the booming new situation, and fibre system wherein just has a photoreceiver, photoreceiver including
Photodetector and amplifier and interlock circuit composition.The photodetector component part important as fibre system, therewith
Corresponding amplifier and related circuit design are also particularly important.
Currently, the precision of most photodetectors is lower, vulnerable to the interference of external environment, response speed is slow, volume is big, makes an uproar
The horizontal low feature of sound.Precision, easy requirement are further proposed to adapt to fibre system in acquisition phase, while realizing low function
Consumption, using flexible, fast response time, low noise needs, in addition, in order to further shorten the development cycle and save cost.
Summary of the invention
That the invention solves noises is high, sensitivity is low, measurement accuracy is low, volume is big, vulnerable to the deficiency of external environmental interference,
Realize a kind of high-precision modular optical photo-detector arrangement.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of modular optical photo-detector arrangement, including
Measured signal unit, APD module, current amplifier module, power module, voltage amplification module, output signal unit, it is described to
The output port for surveying signal element is connect with the input port of APD module, the output port and current amplifier of the APD module
Module connection, the power module connect with current amplifier module and the one of input port of voltage amplification module respectively
It connecing, one of output port of the current amplifier module is connect with one of input port of voltage amplification module,
The output port of the voltage amplification module is connect with the input terminal of output signal unit.
The incident light that measured signal unit issues enters APD module and changes into current signal, and the APD module is by current signal
It is delivered to amplifier chip U1 in current amplifier module, current signal is delivered to voltage amplification again by the current amplifier module
Current signal is delivered in output signal unit by amplifier chip U2 in module, the voltage amplification module.
The current amplifier module includes resistance R1, resistance R2, capacitor C1, capacitor C2 and amplifier chip U1, the fortune
It puts and serially adds resistance R1, capacitor C1 and resistance R2, capacitor C2 on the positive-negative power of chip U1 power supply respectively.
The current amplifier module further includes resistance R3, resistance R4, resistance Rf, the resistance Rf, resistance R4, resistance R3
It constituting T-type network and is connected in parallel on the both ends amplifier chip U1, one end of the resistance Rf is connect with the reverse input end of amplifier chip U1,
The output end of resistance R4 ground connection, resistance R3 and amplifier chip connects.
The current amplifier module further includes capacitor C3, capacitor C4 and resistance R5, and the capacitor C2 is as feedback loop
A part it is in parallel with resistance Rf, the amplifier chip U1 output end forms a filter circuit by resistance R5 and capacitor C4.
The voltage amplification module includes amplifier chip U2, capacitor C5, capacitor C6, capacitor C7 resistance R6, resistance R7 and electricity
R8 is hindered, serially adds capacitor C6, capacitor C7, the resistance R8, capacitor respectively on the positive-negative power of the amplifier chip U2 power supply
After C5 is in parallel, one end is connect with the output end of amplifier chip U2, and the other end is connect with the reverse input end of amplifier chip U2, is constituted
Feedback loop, the resistance R7 are connected with the anode of amplifier chip U2, and resistance R6 and resistance R8 constitute a gain link.
The signal output unit forms a filter circuit, the one end resistance R9 connection fortune by resistance R9 and capacitor C8
The output end of chip U2 is put, the resistance R9 other end is only used as signal output unit output end, and the resistance R9 and signal are defeated
It is grounded between unit output end by capacitor R8 out.
The requirement of modular optical photo-detector arrangement strong antijamming capability, high sensitivity, low noise of the present invention, is realized simultaneously
Equipment small size, low-power consumption, using flexible needs, weighed gain, bandwidth and the noise level of system, it is real on this basis
The amplification of high-precision small-signal is showed.
Detailed description of the invention
The content of width attached drawing every in description of the invention expression is briefly described below:
Fig. 1 is modular optical photo-detector arrangement structural block diagram；
Fig. 2 is modular optical photo-detector arrangement circuit diagram.
Specific embodiment
Modular optical photo-detector arrangement following module (unit) as shown in Figure 1, be made of: measured signal unit,
Avalanche photodide (APD) module, current amplifier module, power module, voltage amplification module, output signal unit.To
The output port for surveying signal element is connect with the input port of APD module, the output port and current amplifier module of APD module
Connection, power module are connect with current amplifier module and the one of input port of voltage amplification module respectively, and electric current is put
One of output port of big device module is connect with one of input port of voltage amplification module, voltage amplification module
Output port is connect with the input terminal of output signal unit, and six modules are carried out the electromagnetic shielding box that integration is placed on aluminium material
In the middle.
As shown in Fig. 2, incident light, which enters the APD module being photoelectrically converted in unit after photoelectric conversion unit, changes into electric current letter
Number, what photoelectric conversion module was used is PIN type photodiode i.e. APD (the snowslide light for working in high reverse bias voltage
Electric diode), which has shorter response time and higher internal gain, and quantum efficiency is high, dark current is small.
The current signal of photodetector anode (PD+) output is input in current amplifier module in photoelectric conversion unit
The reverse input end (In-) of amplifier chip U1, cathode (PD-) ground connection of photodetector；Electricity after current amplifier module
Pressure signal is input to the reverse input end (I-) of amplifier chip U2 in voltage amplification module, the voltage letter by voltage amplification module
It number is input in output signal unit, to realize the amplification and detection to small-signal.
Current amplifier module is by resistance R1, R2, R3, R4, R5, Rf, capacitor C1, C2, C3, C4 and amplifier chip U1 group
At；Serially add R1, C1 and R2, C2 respectively on the positive-negative power of chip U1 power supply.For stabling current amplifier module
Work reduces the parasitic couplings generated between volume module by public direct-current power supply, prevents to interfere.Resistance Rf, R4, R3 structure
The both ends amplifier chip U1 are connected in parallel at T-type network, temperature drift is reduced, the variation of bias current is effectively controlled, to improve whole
The sensitivity and accuracy of a photodetector.One end of Rf is connect with the reverse input end (I n-) of amplifier chip U1, and R4 connects
The output end of ground, R3 and amplifier chip connects, and constitutes feedback loop.Capacitor C2 as feedback loop a part it is in parallel with Rf rise
To integral action, there are inhibition or the interference of smooth noise.Amplifier chip U1 output end is made of resistance R5 and capacitor C4
One filter circuit is realized and carries out low-pass filtering to output signal.
Voltage amplification module is made of resistance R6, R7, R8, R9, capacitor C5, C6, C7, C8 and amplifier chip U2；Amplifier core
Serially add C6, C7 respectively on the positive-negative power of piece U2 power supply, in order to stabling current amplifier module work, filter out high frequency at
Divide, reduce offset current.Resistance R8, capacitor C5 are in parallel with amplifier chip U2, and one end is connect with the output end of amplifier chip U2, separately
One end is connect with the reverse input end of amplifier chip U2, constitutes feedback loop；Capacitor C5 is played as a part of feedback loop
The effect for stablizing amplifier, reducing noise, increasing bandwidth and amplifier lead compensation；The a part and electricity of resistance R8 as feedback loop
Hold C5 and constitutes low-pass filtering network simultaneously；Resistance R7 is connected with the anode of amplifier chip U2；Resistance R6 and R8 constitute an increasing
Beneficial link, wherein gain coefficient A=1+R8/R6；Signal output unit forms a filter circuit by resistance R9 and capacitor C8, real
Low-pass filtering now is carried out to output signal；Capacitor C8 plays the role of reducing the noise in circuit and filtering as load capacitance.
Based on above-mentioned hardware configuration, modular optical photo-detector arrangement working principle: the output end of electric measured signal unit
Mouth is connect with the input port of APD module, and the output port of APD module is connect with current amplifier module, power module difference
Connect with current amplifier module and the one of input port of voltage amplification module, current amplifier module one of them
Output port is connect with one of input port of voltage amplification module, the output port and output signal of voltage amplification module
The input terminal of unit connects.Incident light enters the APD module being photoelectrically converted in unit after photoelectric conversion unit and changes into electric current letter
Number, the current signal of photodetector anode (PD+) output is input to amplifier in current amplifier module in photoelectric conversion unit
The reverse input end (In-) of chip U1, cathode (PD-) ground connection of photodetector；Voltage letter after current amplifier module
It number is input to the reverse input end (In-) of amplifier chip U2 in voltage amplification module, by the voltage signal of voltage amplification module
It is input in output signal unit, to realize the amplification and detection to small-signal.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing
It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.
Claims (7)
1. a kind of modular optical photo-detector arrangement, it is characterised in that: including measured signal unit, APD module, current amplifier
Module, power module, voltage amplification module, output signal unit, output port and the APD module of the measured signal unit
Input port connection, the output port of the APD module connect with current amplifier module, the power module respectively with electric current
Amplifier module is connected with the one of input port of voltage amplification module, and one of them of the current amplifier module is defeated
Exit port is connect with one of input port of voltage amplification module, and the output port of the voltage amplification module and output are believed
The input terminal connection of number unit.
2. modular optical photo-detector arrangement according to claim 1, it is characterised in that: what measured signal unit issued enters
It penetrates light and enters APD module and change into current signal, current signal is delivered to amplifier core in current amplifier module by the APD module
Current signal is delivered to amplifier chip U2 in voltage amplification module again by piece U1, the current amplifier module, and the voltage is put
Current signal is delivered in output signal unit by big module.
3. modular optical photo-detector arrangement according to claim 2, it is characterised in that: the current amplifier module packet
Resistance R1, resistance R2, capacitor C1, capacitor C2 and amplifier chip U1 are included, on the positive-negative power of the amplifier chip U1 power supply
Resistance R1, capacitor C1 and resistance R2, capacitor C2 are serially added respectively.
4. modular optical photo-detector arrangement according to claim 3, it is characterised in that: the current amplifier module is also
T-type network, which is constituted, including resistance R3, resistance R4, resistance Rf, the resistance Rf, resistance R4, resistance R3 is connected in parallel on amplifier chip U1
The one end at both ends, the resistance Rf is connect with the reverse input end of amplifier chip U1, resistance R4 ground connection, resistance R3 and amplifier chip
Output end connection.
5. modular optical photo-detector arrangement according to claim 4, it is characterised in that: the current amplifier module is also
Including capacitor C3, capacitor C4 and resistance R5, the capacitor C2 is in parallel with resistance Rf as a part of feedback loop, the amplifier
Chip U1 output end forms a filter circuit by resistance R5 and capacitor C4.
6. according to modular optical photo-detector arrangement described in claim 2,3,4 or 5, it is characterised in that: the voltage amplification
Module includes amplifier chip U2, capacitor C5, capacitor C6, capacitor C7 resistance R6, resistance R7 and resistance R8, the amplifier chip U2 confession
After capacitor C6, capacitor C7, the resistance R8, capacitor C5 parallel connection are serially added on the positive-negative power of power supply respectively, one end and amplifier core
The output end of piece U2 connects, and the other end connect with the reverse input end of amplifier chip U2, composition feedback loop, the resistance R7 with
The anode of amplifier chip U2 is connected, and resistance R6 and resistance R8 constitute a gain link.
7. modular optical photo-detector arrangement according to claim 6, it is characterised in that: the signal output unit is by electricity
It hinders R9 and capacitor C8 and forms a filter circuit, the one end the resistance R9 connects the output end of amplifier chip U2, the resistance R9
The other end is only used as signal output unit output end, is connect between the resistance R9 and signal output unit output end by capacitor R8
Ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811488641.0A CN109639343A (en) | 2018-12-06 | 2018-12-06 | A kind of modular optical photo-detector arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811488641.0A CN109639343A (en) | 2018-12-06 | 2018-12-06 | A kind of modular optical photo-detector arrangement |
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| CN109639343A true CN109639343A (en) | 2019-04-16 |
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| CN201811488641.0A Pending CN109639343A (en) | 2018-12-06 | 2018-12-06 | A kind of modular optical photo-detector arrangement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440780A (en) * | 2019-06-21 | 2019-11-12 | 西安德讯威光电测控技术有限公司 | A kind of big bandwidth, miniaturization laser gyro preamplifier |
| CN110677150A (en) * | 2019-09-02 | 2020-01-10 | 安徽华东光电技术研究所有限公司 | Device for converting AC small signal into DC signal |
| CN111498389A (en) * | 2020-03-24 | 2020-08-07 | 安徽宇升智能装备有限公司 | Conveying device for piece goods and method for eliminating interference on conveying device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440780A (en) * | 2019-06-21 | 2019-11-12 | 西安德讯威光电测控技术有限公司 | A kind of big bandwidth, miniaturization laser gyro preamplifier |
| CN110677150A (en) * | 2019-09-02 | 2020-01-10 | 安徽华东光电技术研究所有限公司 | Device for converting AC small signal into DC signal |
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| CN111498389A (en) * | 2020-03-24 | 2020-08-07 | 安徽宇升智能装备有限公司 | Conveying device for piece goods and method for eliminating interference on conveying device |
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Application publication date: 20190416 |
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