CN104359455A - Photodiode circuit based on background noise elimination and laser ranging system - Google Patents
Photodiode circuit based on background noise elimination and laser ranging system Download PDFInfo
- Publication number
- CN104359455A CN104359455A CN201410728279.5A CN201410728279A CN104359455A CN 104359455 A CN104359455 A CN 104359455A CN 201410728279 A CN201410728279 A CN 201410728279A CN 104359455 A CN104359455 A CN 104359455A
- Authority
- CN
- China
- Prior art keywords
- photodiode
- operational amplifier
- resistance
- module
- circuit
- 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.)
- Granted
Links
- 230000008030 elimination Effects 0.000 title abstract description 6
- 238000003379 elimination reaction Methods 0.000 title abstract description 6
- 230000003321 amplification Effects 0.000 claims abstract description 30
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 206010038743 Restlessness Diseases 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/02—Details
- G01C3/06—Use of electric means to obtain final indication
- G01C3/08—Use of electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4861—Circuits for detection, sampling, integration or read-out
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a photodiode circuit based on background noise elimination and a laser ranging system. The photodiode circuit based on background noise elimination, provided by the invention, comprises a photodiode transconductance amplifier module, an operational amplification integrator module and a filtration module, wherein the filtration module is connected to the output end of the photodiode transconductance amplifier module and the input end of the operational amplification integrator module; and the output end of the operational amplification integrator module is connected to the input end of the photodiode transconductance amplifier module. According to the photodiode circuit disclosed by the invention, only an operational amplifier, a capacitor and a resistor can be used by the operational amplification integrator module, only a capacitor and a resistor can be used for a filter circuit, a digital element is not used in the whole circuit, extra noise is avoided, the signal to noise ratio of the circuit can be greatly improved, and the ranging range is widened. Meanwhile, because only the operational amplifier, the resistor and the capacitor are used, the cost is greatly reduced compared with the prior art, and the overall circuit area is greatly reduced, so that miniaturization of the product is facilitated.
Description
Technical field
The present invention relates to photodiode application circuit field, be specifically related to a kind of photodiode circuit can eliminating ground unrest, and apply the laser distance measuring system of this diode circuit.
Background technology
Photodiode circuit is widely used in the fields such as laser ranging, rays safety detection apparatus, motion control, analytical instrument, biologic medical, optical communication, military affairs, Aero-Space, optical communication.Wherein, the photodiode circuit generally adopted in pulse type laser range finding field comprises photodiode mutual conductance amplifying circuit, as shown in Figure 1, the most basic photodiode mutual conductance amplifying circuit mainly comprises operational amplifier U11, photodiode LD1 and resistance R11 and electric capacity C11.But this circuit exports and has a direct current biasing, and as shown in Figure 2, this direct current biasing that is to say ground unrest, and it is caused by the input bias current of the natural light of co-wavelength (bias light), photodiode dark current and trsanscondutance amplifier.Due in laser distance measuring system based on the decision level of flight time often very low (about 200mV), this direct current biasing can affect decision level, therefore in the range measurement system of reality, this ground unrest is needed to eliminate, allow when not having pulse signal, the output of photodiode mutual conductance amplifying circuit is 0.
The maximum photodiode circuit can eliminating ground unrest of current application as shown in Figure 3, this circuit adds analog to digital converter (ADC) on the basis of basic photodiode mutual conductance amplifying circuit, digital to analog converter (DAC), single-chip microcomputer (MCU), the elements such as impact damper (BUFFER) and resistance R12, its principle gathers the output voltage of photodiode mutual conductance amplifying circuit by analog to digital converter and is sent in single-chip microcomputer, needing the voltage value compensated to give digital to analog converter after carrying out filtering scheduling algorithm by single-chip microcomputer, then the input of photodiode mutual conductance amplifying circuit is exported to, thus reach the object of the output voltage zeroing of photodiode mutual conductance amplifying circuit.
But there is following shortcoming in this circuit of prior art:
1, owing to employing digital element (single-chip microcomputer), cause additionally adding noise, the finding range of photodiode can be made to diminish, thus can make that the distance of range finding is remarkable must shorten;
2, add more extra element, cause cost compare high;
3, the Area comparison of integrated circuit is large, is unfavorable for the miniaturization of product.
Summary of the invention
The present invention is directed to exist in the photodiode circuit that prior art uses additionally add that noise causes finding range to diminish, element is more causes that cost is higher, integrated circuit area causes more greatly being unfavorable for the technical matterss such as product miniaturization, propose a kind ofly significantly to reduce noise, cost is lower, integrated circuit area the is less photodiode circuit eliminated based on ground unrest.
A kind of photodiode circuit eliminated based on ground unrest that the present invention proposes, it comprises photodiode mutual conductance amplification module, amplifier integrator module, filtration module, described filtration module is connected to the output terminal of described photodiode mutual conductance amplification module and the input end of described amplifier integrator module, and the output terminal of described amplifier integrator module is connected to the input end of described photodiode mutual conductance amplification module.
Concrete, described amplifier integrator module comprises the first operational amplifier, the first electric capacity, the first resistance and the second resistance; Between the inverting input that described first electric capacity is connected to described first operational amplifier and output terminal; Described first resistance one end is connected to the inverting input of described first operational amplifier, other end ground connection; Described second resistance one end be connected to described first operational amplifier output terminal, the other end is connected to the input end of described photodiode mutual conductance amplification module; The in-phase input end of described first operational amplifier is connected to the output terminal of described filtration module.
Concrete, described photodiode mutual conductance amplification module comprises photodiode, the second operational amplifier, the 3rd resistance and the second electric capacity; The negative electrode access bias voltage of described photodiode, anode is connected to the inverting input of described second operational amplifier; Between the inverting input being connected to described second operational amplifier after described 3rd resistance and the second Capacitance parallel connection and output terminal; The inverting input of described second operational amplifier also connects with described second resistance, output terminal also with the connecting of described filtration module.
Concrete, described filtration module comprises the 3rd electric capacity and the 4th resistance; Described 3rd electric capacity one end ground connection, the other end connects with the in-phase input end of described first operational amplifier and one end of described 4th resistance respectively, and the other end of described 4th resistance connects with the output terminal of described second operational amplifier.
Concrete, described photodiode is avalanche photodide.
Accordingly, the present invention is corresponding proposes a kind of laser distance measuring system, and it comprises above-mentioned arbitrary photodiode circuit eliminated based on ground unrest.
Beneficial effect: a kind of photodiode circuit eliminated based on ground unrest that the present invention proposes, which employs amplifier integrator module, integration can be carried out to the direct current biasing that photodiode mutual conductance amplification module exports, and send back to the input end of photodiode mutual conductance amplification module, to reach the object of DC-offset correction.Meanwhile, the filtration module in the present invention can filter out the high frequency noise (high frequency noise is pulse signal itself mainly) of photodiode mutual conductance amplification module output terminal, thus makes amplifier integrator not by the impact of this high frequency noise.
In the present invention, amplifier integrator module can only use operational amplifier, electric capacity and resistance, filtering circuit can only use electric capacity and resistance, and whole circuit does not use digital element, can not bring additional noise, largely can improve the signal to noise ratio (S/N ratio) of circuit, increase finding range; Simultaneously owing to only using operational amplifier, resistance and electric capacity, cost hinge structure reduces many, and integrated circuit area also greatly reduces, thus is conducive to the miniaturization of product.
Accompanying drawing explanation
Fig. 1 is photodiode mutual conductance amplification circuit structure schematic diagram basic in prior art.
Fig. 2 is the output of photodiode mutual conductance amplifying circuit in prior art waveform comparison figure when there is ground unrest and when there is not ground unrest.
Fig. 3 is the photodiode circuit structural representation can eliminating ground unrest used in prior art.
Fig. 4 is the structural representation of a kind of photodiode circuit embodiment based on ground unrest elimination that the present invention proposes.
Fig. 5 is the MATLAB simulation result schematic diagram of the circuit structure based on Fig. 4.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the present invention is described further below in conjunction with accompanying drawing and embodiment.
Refer to Fig. 4, a kind of photodiode circuit embodiment eliminated based on ground unrest that the present invention proposes, it comprises photodiode mutual conductance amplification module, amplifier integrator module, filtration module, described filtration module is connected to the output terminal of described photodiode mutual conductance amplification module and the input end of described amplifier integrator module, and the output terminal of described amplifier integrator module is connected to the input end of described photodiode mutual conductance amplification module.
A kind of photodiode circuit eliminated based on ground unrest that the present embodiment proposes, which employs amplifier integrator module, integration can be carried out to the direct current biasing that photodiode mutual conductance amplification module exports, and send back to the input end of photodiode mutual conductance amplification module, to reach the object of DC-offset correction.Meanwhile, the filtration module in the present embodiment can filter out the high frequency noise (high frequency noise is pulse signal itself mainly) of photodiode mutual conductance amplification module output terminal, thus makes amplifier integrator not by the impact of this high frequency noise.
In the present embodiment, amplifier integrator module can only use operational amplifier, electric capacity and resistance, filtering circuit can only use electric capacity and resistance, and whole circuit does not use digital element, can not bring additional noise, largely can improve the signal to noise ratio (S/N ratio) of circuit, increase finding range; Simultaneously owing to only using operational amplifier, resistance and electric capacity, cost hinge structure reduces many, and integrated circuit area also greatly reduces, thus is conducive to the miniaturization of product.
In order to realize the object of the present embodiment better, the present embodiment has done optimal design for described amplifier integrator module, concrete, and described amplifier integrator module comprises the first operational amplifier U1, the first electric capacity C1, the first resistance R1 and the second resistance R2; Between the inverting input that described first electric capacity C1 is connected to described first operational amplifier U1 and output terminal; Described first resistance R1 mono-end is connected to the inverting input of described first operational amplifier U1, other end ground connection; Described second resistance R2 mono-end be connected to described first operational amplifier U1 output terminal, the other end is connected to the input end of described photodiode mutual conductance amplification module; The in-phase input end of described first operational amplifier U1 is connected to the output terminal of described filtration module.
In the present embodiment, described photodiode mutual conductance amplification module can be the most basic photodiode mutual conductance amplifying circuit, concrete, and it comprises photodiode LD, the second operational amplifier U2, the 3rd resistance R3 and the second electric capacity C2; The negative electrode access bias voltage of described photodiode LD, anode is connected to the inverting input of described second operational amplifier U2; Between the inverting input being connected to described second operational amplifier U2 after described 3rd resistance R3 and the second electric capacity C2 parallel connection and output terminal; The inverting input of described second operational amplifier U2 also connects with described second resistance R2, output terminal also with the connecting of described filtration module.
In order to realize the object of the present embodiment further better, filtration module described in the present embodiment can be common RC low-pass filter, concrete, and the filtration module of the present embodiment comprises the 3rd electric capacity C3 and the 4th resistance R4; Described 3rd electric capacity C3 one end ground connection, the other end connects with the in-phase input end of described first operational amplifier U1 and one end of described 4th resistance R4 respectively, and the other end of described 4th resistance R4 connects with the output terminal of described second operational amplifier U2.
In the present embodiment, described photodiode LD can be avalanche photodide.
Based on the particular circuit configurations of above-mentioned amplifier integrator module, photodiode mutual conductance amplification module and filtration module, below carry out circuit analysis, to be described in further detail the process realizing the present embodiment object.
Please continue to refer to Fig. 4, in the present embodiment, the first operational amplifier U1 and the second operational amplifier U2 is used as desirable operational amplifier.Owing to employing this energy-storage travelling wave tube of electric capacity, therefore following employing S domain analysis method, the variable of capitalization all represents S territory function, and the variable of small letter is real number, and resistance and condenser symbol all represent real number.
In order to simplify calculating, the second electric capacity C2 (filter capacitor) is not counted in derivation.First electric capacity C1 (integrating capacitor) is reduced to C in derivation, and the resistance of the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 is designated as R respectively
1, R
2, R
3and R
4, then:
The output voltage V of photodiode mutual conductance amplification module
ofor:
V
o＝-I
i·R
3
The electric current flowing through the first electric capacity C1 equals the electric current flowing through the first resistance R1, this electric current I
1for:
The output voltage V of amplifier integrator module
0mfor:
Offset current (flowing through the electric current of the second resistance R2) I
mfor:
The input current I of the second operational amplifier U2
i, photocurrent I
pdwith offset current I
malso have following relation:
I
i＝I
pd-I
m
Will above two containing I
mequation merge, cancellation I
m:
Background photo current is made to be step input signal, then I
pdcan be expressed as:
Wherein, i
pdbe the actual electric current out of photodiode LD, substitute into I above
iformula, and simplify obtain:
Ask granny rag Lars inverse transformation can obtain the input current i of the second operational amplifier U2
itime-domain expression:
Time-domain expression can be seen thus, and the actual electric current being input to the second operational amplifier U2 inverting input successively decreases with the trend of the negative exponent of natural logarithm, finally can be substantially equal to 0.Because all circuit components are not desirable, so this electric current can be finally zero.So the output of mutual conductance is also zero.Select suitable resistance and electric capacity, this decline trend can be allowed faster.
From above conclusion of deriving, no matter bias light is how many, the output of described photodiode mutual conductance amplification module finally all can be adjusted to 0 automatically.
Meanwhile, from the circuit result of reality, also demonstrate the feasibility of the present embodiment scheme, refer to Fig. 5, Fig. 5 is the result after the electrical block diagram of Fig. 4 in the present embodiment adopts MATLAB to emulate.According to the configuration of each resistance in Fig. 5 left side and electric capacity, if there is ground unrest electric current (the i.e. I of 100uA
pd=100uA), this Circuits System can allow the VD of photodiode mutual conductance amplification module drop to 0.1V, circuit successful within the time of 0.53ms.Parameter adjustment can be carried out as required, to obtain the attenuation characteristic wanted.
Accordingly, the invention allows for a kind of laser distance measuring system embodiment, it comprises above-mentioned based on arbitrary circuit structure scheme in the photodiode circuit embodiment of ground unrest elimination, its beneficial effect please refer to the introduction of the above-mentioned photodiode circuit embodiment based on ground unrest elimination, repeats no more here.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (6)
1. the photodiode circuit eliminated based on ground unrest, it is characterized in that, comprise photodiode mutual conductance amplification module, amplifier integrator module, filtration module, described filtration module is connected to the output terminal of described photodiode mutual conductance amplification module and the input end of described amplifier integrator module, and the output terminal of described amplifier integrator module is connected to the input end of described photodiode mutual conductance amplification module.
2. the photodiode circuit eliminated based on ground unrest according to claim 1, it is characterized in that, described amplifier integrator module comprises the first operational amplifier, the first electric capacity, the first resistance and the second resistance; Between the inverting input that described first electric capacity is connected to described first operational amplifier and output terminal; Described first resistance one end is connected to the inverting input of described first operational amplifier, other end ground connection; Described second resistance one end be connected to described first operational amplifier output terminal, the other end is connected to the input end of described photodiode mutual conductance amplification module; The in-phase input end of described first operational amplifier is connected to the output terminal of described filtration module.
3. the photodiode circuit eliminated based on ground unrest according to claim 2, it is characterized in that, described photodiode mutual conductance amplification module comprises photodiode, the second operational amplifier, the 3rd resistance and the second electric capacity; The negative electrode access bias voltage of described photodiode, anode is connected to the inverting input of described second operational amplifier; Between the inverting input being connected to described second operational amplifier after described 3rd resistance and the second Capacitance parallel connection and output terminal; The inverting input of described second operational amplifier also connects with described second resistance, output terminal also with the connecting of described filtration module.
4. the photodiode circuit eliminated based on ground unrest according to claim 3, it is characterized in that, described filtration module comprises the 3rd electric capacity and the 4th resistance; Described 3rd electric capacity one end ground connection, the other end connects with the in-phase input end of described first operational amplifier and one end of described 4th resistance respectively, and the other end of described 4th resistance connects with the output terminal of described second operational amplifier.
5. the photodiode circuit eliminated based on ground unrest according to claim 3, it is characterized in that, described photodiode is avalanche photodide.
6. a laser distance measuring system, is characterized in that, comprises the photodiode circuit eliminated based on ground unrest described in any one of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728279.5A CN104359455B (en) | 2014-12-03 | 2014-12-03 | The photodiode circuit eliminated based on ambient noise and LDMS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728279.5A CN104359455B (en) | 2014-12-03 | 2014-12-03 | The photodiode circuit eliminated based on ambient noise and LDMS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104359455A true CN104359455A (en) | 2015-02-18 |
| CN104359455B CN104359455B (en) | 2016-09-07 |
Family
ID=52526740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410728279.5A Active CN104359455B (en) | 2014-12-03 | 2014-12-03 | The photodiode circuit eliminated based on ambient noise and LDMS |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104359455B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484794A (en) * | 2015-11-19 | 2016-04-13 | 辽宁工程技术大学 | Anti-deflection system for tunnel excavation |
| WO2019119176A1 (en) * | 2017-12-18 | 2019-06-27 | 深圳市汇顶科技股份有限公司 | Current sampling and holding circuit, and sensor |
| CN111510112A (en) * | 2020-04-26 | 2020-08-07 | 南京理工大学 | Optical pulse receiving circuit capable of resisting strong light interference |
| CN113608230A (en) * | 2021-08-03 | 2021-11-05 | 汤恩智能科技(常熟)有限公司 | Distance measurement method, device and equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3683983A1 (en) * | 2019-01-18 | 2020-07-22 | Melexis Technologies NV | Optical detector with dc compensation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0818884B1 (en) * | 1996-07-12 | 2004-03-31 | Samsung Electronics Co., Ltd. | Apparatus for stabilizing cut-off frequency using a transconductance |
| CN201207034Y (en) * | 2008-02-01 | 2009-03-11 | 凯迈（洛阳）测控有限公司 | Photoelectric conversion pre-amplifier circuit |
| CN101741469A (en) * | 2008-11-21 | 2010-06-16 | 株式会社日立制作所 | Optical line terminal and optical line transceiver system |
| CN201584972U (en) * | 2009-12-04 | 2010-09-15 | 天津光电通信技术有限公司 | Optical receiving module with large dynamic range and low noise |
| CN103017729A (en) * | 2012-11-20 | 2013-04-03 | 王振兴 | Method for improving precision of laser range finder |
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
-
2014
- 2014-12-03 CN CN201410728279.5A patent/CN104359455B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0818884B1 (en) * | 1996-07-12 | 2004-03-31 | Samsung Electronics Co., Ltd. | Apparatus for stabilizing cut-off frequency using a transconductance |
| CN201207034Y (en) * | 2008-02-01 | 2009-03-11 | 凯迈（洛阳）测控有限公司 | Photoelectric conversion pre-amplifier circuit |
| CN101741469A (en) * | 2008-11-21 | 2010-06-16 | 株式会社日立制作所 | Optical line terminal and optical line transceiver system |
| CN201584972U (en) * | 2009-12-04 | 2010-09-15 | 天津光电通信技术有限公司 | Optical receiving module with large dynamic range and low noise |
| CN103017729A (en) * | 2012-11-20 | 2013-04-03 | 王振兴 | Method for improving precision of laser range finder |
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
Non-Patent Citations (1)
| Title |
|---|
| GLEN BRSEBOJS 等: "输出噪声仅有传统跨导放大器1/3的光电二极管放大器", 《电子设计技术》, 31 July 2007 (2007-07-31), pages 116 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484794A (en) * | 2015-11-19 | 2016-04-13 | 辽宁工程技术大学 | Anti-deflection system for tunnel excavation |
| WO2019119176A1 (en) * | 2017-12-18 | 2019-06-27 | 深圳市汇顶科技股份有限公司 | Current sampling and holding circuit, and sensor |
| CN111510112A (en) * | 2020-04-26 | 2020-08-07 | 南京理工大学 | Optical pulse receiving circuit capable of resisting strong light interference |
| CN113608230A (en) * | 2021-08-03 | 2021-11-05 | 汤恩智能科技(常熟)有限公司 | Distance measurement method, device and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104359455B (en) | 2016-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104359455A (en) | Photodiode circuit based on background noise elimination and laser ranging system | |
| Fuada et al. | A first approach to design mobility function and noise filter in VLC system utilizing low-cost analog circuits | |
| CN204575534U (en) | A kind of laser interferometer photoelectric detective circuit | |
| CN104298962A (en) | Fingerprint detection device and method | |
| CN107294497B (en) | Conversion circuit, heartbeat current signal conversion device and method and heartbeat detection system | |
| CN105227245A (en) | A kind of receiving system of the visible light communication system based on white light LEDs | |
| CN102890177A (en) | Signal intensity detection circuit of trans-impedance amplifier | |
| CN104748858A (en) | InGaAs shortwave infrared detector signal processing system | |
| CN107238746A (en) | A kind of micro current circuit tested for dielectric response | |
| US20120105033A1 (en) | Light amount detecting apparatus, and light amount information processing apparatus | |
| CN106850055B (en) | A kind of wideband low noise analog front circuit for optical fiber hit detection system | |
| CN107332529B (en) | Automatic gain control circuit for fully differential trans-impedance amplifier | |
| CN110855370B (en) | MZ modulator array bias control system based on STM32 treater | |
| CN203416227U (en) | Small signal amplification circuit | |
| CN103162839B (en) | Reading circuit for Nb5 N6 normal temperature Terahertz detector linear array | |
| CN205506907U (en) | Generator rotor current measurement system | |
| CN116202700A (en) | Charge signal acquisition conditioning device and system | |
| CN206835056U (en) | A kind of collection amplifying circuit based on APD | |
| WO2017074385A1 (en) | Receivers with automatic gain control | |
| CN106341189B (en) | Optical module | |
| CN213821443U (en) | Analog amplification circuit based on high-frequency EEG signal | |
| CN110601724B (en) | Weak photoelectric signal anti-interference long-distance transmission system | |
| CN105938012A (en) | Terahertz detection device | |
| CN203122375U (en) | Non-invasive blood pressure anti-interference circuit | |
| CN208174644U (en) | A kind of number tunable capacitor circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180705 Address after: 518000 C1-19 building, Nanshan Zhiyuan 1001, Xue Yuan Avenue, Nanshan District Taoyuan street, Shenzhen, Guangdong. Patentee after: Shenzhen run sun Photoelectric Technology Co., Ltd. Address before: 510000 Guangdong science and Technology Development Zone, Guangzhou high tech Industrial Development Zone, 1604 Patentee before: Zhang Shi |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191212 Address after: 518000 Building 901, C1, Nanshan Zhiyuan, 1001 Xueyuan Avenue, Changyuan Community, Taoyuan Street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Yuwei Optical Technology Co., Ltd. Address before: 518000 C1-19 building, Nanshan Zhiyuan 1001, Xue Yuan Avenue, Nanshan District Taoyuan street, Shenzhen, Guangdong. Patentee before: Shenzhen run sun Photoelectric Technology Co., Ltd. |
|
| TR01 | Transfer of patent right |