CN207181517U - A kind of detection circuit of detection avalanche photodide bias current value accurate in real time - Google Patents
A kind of detection circuit of detection avalanche photodide bias current value accurate in real time Download PDFInfo
- Publication number
- CN207181517U CN207181517U CN201721149489.4U CN201721149489U CN207181517U CN 207181517 U CN207181517 U CN 207181517U CN 201721149489 U CN201721149489 U CN 201721149489U CN 207181517 U CN207181517 U CN 207181517U
- Authority
- CN
- China
- Prior art keywords
- detection
- avalanche photodide
- current sensor
- circuit
- current
- 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.)
- Withdrawn - After Issue
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 230000009977 dual effect Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 230000007774 longterm Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Landscapes
- Light Receiving Elements (AREA)
Abstract
The utility model discloses a kind of detection circuit of detection avalanche photodide bias current value accurate in real time, it is used for the bias current value for when avalanche photodide is in avalanche condition, detecting avalanche photodide.Detecting circuit includes DA change-over circuits, current sensor, current source, A/D convertor circuit, resistance R1~R3.On the one hand the end of oppisite phase of current sensor connects the anode of avalanche photodide, be on the other hand grounded via resistance R1 connection in-phase ends, another aspect via resistance R2, in-phase end is also electrically connected with DA change-over circuits；After current sensor uses its output end of dual power supply via resistance R3, one side connects current source, on the other hand connects A/D convertor circuit, the signal output part of A/D convertor circuit is as the signal output part for entirely detecting circuit.The dual power supply of current sensor is that the size of negative voltage and magnitude of voltage is depended on when no electric current passes through resistance R1, and the input voltage of A/D convertor circuit is 0V.
Description
Technical field
It the utility model is related to a kind of detection circuit in Technique on Quantum Communication field, more particularly to a kind of inspection accurate in real time
The detection circuit of snow survey avalanche photo diode bias current value.
Background technology
Traditional approach is that the strong light narrow pulse signal for being sent attacker EVE using PIN photodiode is converted into narrow arteries and veins
Electric current, and output and the directly proportional burst pulse voltage of short duration current are rushed, is identified by follow-up main control chip to determine whether
Intensity light attack occurs.However, the method for conventionally employed PIN pipes detection, sensitivity is low, poor linearity, poor accuracy, it is impossible to accurate
Measure APD (Avalanche Photo Diode, avalanche photodide) bias current value.
Also there is Linear to develop APD bias currents detection special chip at present, the current value exported by detecting APD pipes judges
Whether intensity light attack is had.However, it is negative high voltage that APD bias currents detection special chip shortcoming, which can not be applied in APD biass,
Environment.
Utility model content
The use of electrooptical device is APD to solve single-photon detector, and when APD working bias voltages be negative high voltage, generation
Photoelectric current it is very faint, in nA~μ A levels, it is difficult to which the technical problem accurately measured, the utility model provide a kind of accurate in real time
Detect the detection circuit of avalanche photodide bias current value.
Solution of the present utility model is：A kind of detection electricity of detection avalanche photodide bias current value accurate in real time
Road, it is used for the bias current value for when avalanche photodide is in avalanche condition, detecting avalanche photodide；The detection electricity
Road includes DA change-over circuits, current sensor, current source, A/D convertor circuit, resistance R1, resistance R2, resistance R3；Current sensor
End of oppisite phase on the one hand be electrically connected with avalanche photodide anode, on the other hand via resistance R1 be electrically connected with current sense
The in-phase end of device, another aspect are also electrically connected with DA change-over circuits via resistance R2 electrical grounds, the in-phase end of current sensor；
Current sensor uses dual power supply；After the output end of current sensor is via resistance R3, current source is on the one hand electrically connected with,
On the other hand A/D convertor circuit is electrically connected with, the signal output part of A/D convertor circuit is as the whole signal output for detecting circuit
End；Wherein, the dual power supply of current sensor is that the size of negative voltage and magnitude of voltage is depended on when no electric current passes through resistance R1
When, the input voltage of A/D convertor circuit is 0V.
As the further improvement of such scheme, the GND pin and Vcc pins of current sensor respectively connect a negative high voltage reality
The dual power supply of existing current sensor.
Further, the negative high voltage that Vcc pins connect is higher 6.8V than the negative high voltage that GND pin connects.
As the further improvement of such scheme, current sensor is realized using comparator.
As the further improvement of such scheme, current source is realized using power supply chip.
The detection circuit of detection avalanche photodide bias current value accurate in real time of the present utility model, passes through current source and electricity
Resistance R3 realizes is converted to positive voltage variation by negative voltage variation, so that A/D convertor circuit can accurately detect APD pipes in real time
Bias current value, i.e., faint current signal is amplified using current sensor, avalanche photodide is obtained using A/D convertor circuit
Bias current value.The design of current sensor make it that entirely detecting circuit has the characteristics of high accuracy, steady in a long-term；Resistance R2 and electricity
Resistance R3 design make it that entirely detecting circuit has the characteristics of high accuracy, steady in a long-term；The utility model can be applied manages in APD
Working bias voltage detects for the APD pipes bias current of negative high voltage, and bias current detection is accurately, stably.
Brief description of the drawings
Fig. 1 is the circuit diagram for the detection circuit that the utility model accurately detects avalanche photodide bias current value in real time.
Fig. 2 is the application schematic diagram of the utility model detection circuit in Fig. 1.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Detection circuit of the present utility model is a kind of detection avalanche photodide (namely APD pipes) bias current value accurate in real time
Detection circuit, as shown in figure 1, for when avalanche photodide 1 be in avalanche condition, detection avalanche photodide 1
Bias current value.APD pipes can be the domestic APD pipes that can also be imported product, be not limited to single photon detection performance
Detecting circuit includes current sensor 2, current source 3, A/D convertor circuit 4, resistance R1, resistance R2, R3, DA turns of resistance
Change circuit 5.
On the one hand the end of oppisite phase of current sensor 2 is electrically connected with the anode of avalanche photodide 1, on the other hand via electricity
The in-phase end that R1 is electrically connected with current sensor 2 is hindered, another aspect is via resistance R2 electrical grounds, the same phase of current sensor 2
End is also electrically connected with DA change-over circuits 5.Current sensor 2 uses dual power supply, if the earth terminal of current sensor 2 is GND
Two power supplies are electrically connected in pin 8 and current terminal Vcc pins 7, and two power supplies are negative voltage and magnitude of voltage
Size depend on when no electric current passes through resistance R1, the input voltage of A/D convertor circuit 4 is 0V.
After the output end of current sensor 2 is via resistance R3, current source 3 is on the one hand electrically connected with, is on the other hand electrically connected
A/D convertor circuit 4 is connect, the signal output part of A/D convertor circuit 4 detects the signal output part of circuit as whole bias current value, and AD turns
Circuit 4 is changed to be used to the analog signal detected being converted to digital signals for subsequent circuit analysis.
Avalanche photodide 1 is reached bias current caused by avalanche condition and passes through resistance by the utility model detection circuit
R1, to convert the current to voltage；Current sensor 2 exports the voltage amplification；Current source 3 exports constant current so that electricity
Resistance R3 has that fixed voltage is poor, and the output voltage change of current sensor 2 is delivered into the signal input part of A/D convertor circuit 4.
In the present embodiment, current sensor 2 has the characteristics of high accuracy, steady in a long-term；Resistance R2 and resistance R3 have
The characteristics of high-precision, steady in a long-term；Realized by current source 3 and resistance R3 and negative voltage variation is converted into positive voltage variation, from
And A/D convertor circuit 4 is set accurately to detect the bias current values of APD pipes in real time.The utility model can be applied inclined in the work of APD pipes
The APD pipes bias current detection for negative high voltage is pressed, and bias current detection is accurately, stably.
The GND pin 8 and Vcc pins 7 of current sensor 2 can respectively connect double electricity that a negative high voltage realizes current sensor 2
Source powers, and the negative high voltage that Vcc pins 7 connect is higher 6.8V than the negative high voltage that GND pin 8 connects.Current sensor 2 can use comparator real
Existing, current source 3 can use power supply chip to realize.
Referring to Fig. 2, the detection circuit of detection avalanche photodide bias current value accurate in real time of the present utility model is being answered
Used time, a kind of single-photon detector intensity light attack detection circuit can be designed to, for the photoelectricity used in single-photon detector
When converter is that avalanche photodide 1 and avalanche photodide 1 be in avalanche condition, detecting avalanche photodide 1 is
No to be in intensity light attack, the APD pipe bias current values accurately detected in real time to A/D convertor circuit 4 do signal transacting, so as to judge snowslide
Whether photodiode 1 is in intensity light attack.
Single-photon detector intensity light attack detects circuit in detection avalanche photodide accurate in real time of the present utility model
On the basis of the detection circuit of bias current value, increase data processor 10, make output letter of the data processor 10 to A/D convertor circuit 4
Number do signal transacting.
When 1 normal work of avalanche photodide, data processor 10 calculates snow by a bias current matched curve
The current normal current value I0 of avalanche photo diode 1, when avalanche photodide 1 has intensity light attack, data processor 10
The current value I1 obtained according to the output signal of A/D convertor circuit 4, judges whether current value I1 and current value I0 difference DELTA I exceedes
The threshold value of setting, if difference DELTA I exceedes the threshold value of setting, data processor 10 judges avalanche photodide 1 by strong light
Attack occurs, and can also use corresponding measure.
When not connecing when avalanche photodide 1 is not reaching to avalanche condition or APD pipes, controlled by data processor 10
DA change-over circuits 5 processed adjust the magnitude of voltage-HV from the input of the in-phase end of current sensor 2, change the size of current by resistance R1,
Amplified by resistance R1 electric current by current sensor 2 and data signal is converted to by A/D convertor circuit 4, establish voltage
For one-to-one relationship between value-HV and data signal to fit bias current matched curve, data processor 10 can be according to AD
Change-over circuit 4 is exported and current APD bias current values is calculated using bias current matched curve, and bias current matched curve is strong as judging
The foundation of light attack, wherein R2 is the core component of bias current matched curve, and it is used to produce the electric current by R1.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (5)
1. a kind of detection circuit of detection avalanche photodide bias current value accurate in real time, it is used in avalanche photodide
(1) when being in avalanche condition, the bias current value of detection avalanche photodide (1)；It is characterized in that：The detection circuit includes DA
Change-over circuit (5), current sensor (2), current source (3), A/D convertor circuit (4), resistance R1, resistance R2, resistance R3；Electric current passes
The end of oppisite phase of sensor (2) is on the one hand electrically connected with the anode of avalanche photodide (1), on the other hand electrically connects via resistance R1
The in-phase end of current sensor (2) is connect, another aspect is also electric via resistance R2 electrical grounds, the in-phase end of current sensor (2)
Property connection DA change-over circuits (5)；Current sensor (2) uses dual power supply；The output end of current sensor (2) is via resistance
After R3, current source (3) is on the one hand electrically connected with, is on the other hand electrically connected with A/D convertor circuit (4), the letter of A/D convertor circuit (4)
The signal output part of number output end as whole detection circuit；
Wherein, the dual power supply of current sensor (2) is that the size of negative voltage and magnitude of voltage is depended on when no electric current is by electricity
When hindering R1, the input voltage of A/D convertor circuit (4) is 0V.
2. the detection circuit of detection avalanche photodide bias current value accurate in real time as claimed in claim 1, it is characterised in that：
The GND pin (8) and Vcc pins (7) of current sensor (2) respectively connect the dual power supply that a negative high voltage realizes current sensor (2)
Power supply.
3. the detection circuit of detection avalanche photodide bias current value accurate in real time as claimed in claim 2, it is characterised in that：
The negative high voltage that Vcc pins (7) connect is higher 6.8V than the negative high voltage that GND pin (8) connects.
4. the detection circuit of detection avalanche photodide bias current value accurate in real time as claimed in claim 1, it is characterised in that：
Current sensor (2) is realized using comparator.
5. the detection circuit of detection avalanche photodide bias current value accurate in real time as claimed in claim 1, it is characterised in that：
Current source (3) is realized using power supply chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721149489.4U CN207181517U (en) | 2017-09-08 | 2017-09-08 | A kind of detection circuit of detection avalanche photodide bias current value accurate in real time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721149489.4U CN207181517U (en) | 2017-09-08 | 2017-09-08 | A kind of detection circuit of detection avalanche photodide bias current value accurate in real time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207181517U true CN207181517U (en) | 2018-04-03 |
Family
ID=61741931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721149489.4U Withdrawn - After Issue CN207181517U (en) | 2017-09-08 | 2017-09-08 | A kind of detection circuit of detection avalanche photodide bias current value accurate in real time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207181517U (en) |
-
2017
- 2017-09-08 CN CN201721149489.4U patent/CN207181517U/en not_active Withdrawn - After Issue
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110530515A (en) | Photodetection circuit, laser radar and control method | |
| CN102778613B (en) | PIN-FET optical fiber receive module testing performance index method | |
| CN105548848A (en) | Device, equipment and method for measuring breakdown voltage | |
| CN103389451A (en) | A test method and test device for an avalanche photodiode | |
| CN102788641B (en) | A light intensity detection circuit | |
| CN201215954Y (en) | Optical power detection monitoring circuit for digital optical receiver | |
| US8901475B1 (en) | Avalanche photodiode biasing system including a current mirror, voltage-to-current converter circuit, and a feedback path sensing an avalanche photodiode voltage | |
| US8525094B2 (en) | Photoelectric conversion circuit | |
| CN110618309A (en) | Semiconductor detector leakage current measuring device and measuring method | |
| CN204206117U (en) | A kind of amplifier of creatures' physical electric signals circuit of fast detector | |
| CN114826394B (en) | High-precision large-dynamic-range optical channel attenuation detection system and method | |
| CN207181517U (en) | A kind of detection circuit of detection avalanche photodide bias current value accurate in real time | |
| CN201387487Y (en) | Receiver circuit of laser distance meter | |
| CN105241796A (en) | Dust detection apparatus | |
| CN203643494U (en) | Isolated current detection circuit | |
| CN219392207U (en) | A Photodiode High Speed Response Time Measuring Device | |
| CN101692123A (en) | Micro-electromechanical microwave loss compensating microwave power detector | |
| CN204479965U (en) | A kind of power invariability system of laser instrument | |
| CN218673908U (en) | Balanced photoelectric detector | |
| CN207649766U (en) | Faint light current detection circuit | |
| CN109471009A (en) | Bias current value detection circuit and single-photon detector intensity light attack detection circuit, method | |
| CN206132831U (en) | High -end current detection circuit of light detector | |
| CN104407193A (en) | Linear voltage sampling circuit | |
| CN204116404U (en) | A kind of ultra-weak electronic signal measurement by magnification circuit of fast detector | |
| CN204346584U (en) | Light change-over switch input wide region optical power detection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180403 Effective date of abandoning: 20231103 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180403 Effective date of abandoning: 20231103 |