CN105163048A - Dynamic vision sensor based on amplifier multiplexing - Google Patents
Dynamic vision sensor based on amplifier multiplexing Download PDFInfo
- Publication number
- CN105163048A CN105163048A CN201510579585.1A CN201510579585A CN105163048A CN 105163048 A CN105163048 A CN 105163048A CN 201510579585 A CN201510579585 A CN 201510579585A CN 105163048 A CN105163048 A CN 105163048A
- Authority
- CN
- China
- Prior art keywords
- amplifier
- mfb
- closes
- switch
- event
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 14
- 238000013139 quantization Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 238000011002 quantification Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/47—Image sensors with pixel address output; Event-driven image sensors; Selection of pixels to be read out based on image data
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to the field of integrated circuits, and provides a sensor which uses a multiplexing structure to achieve two functions of continuously monitoring light current and quantitatively reading light intensity. The technical scheme adopted in the invention is: in a dynamic vision sensor based on amplifier multiplexing, a photodiode PD is connected with the source level of a logarithmic tube Mfb, and an amplifier A1 is added between the grid and the source electrode of the Mfb to constitute a negative feedback circuit for converting the light current detected by the photodiode into a voltage in a logarithmic manner; the grid of the logarithmic tube Mfb is further connected with a capacitor C1, and a switch SW3 is further added between the capacitor C1 and an amplifier A2; one end of a switch SW4 is connected with the input end of the amplifier A2, and the other end of the switch SW4 is connected with a reference voltage Vref; and a capacitor C2 and a reset switch SW2 are respectively connected with the amplifier A2 in parallel, and a capacitor C3 and a switch SW1 are connected to both ends of the amplifier A2 in parallel after being connected in series. The dynamic vision sensor based on amplifier multiplexing provided by the invention is mainly applied to the design and manufacture of integrated circuits.
Description
Technical field
The present invention relates to integrated circuit fields, particularly relate to the dynamic vision transducer adopting amplifier multiplex mode to carry out light intensity quantification reading.Specifically, relate to based on the multiplexing dynamic vision transducer of amplifier.
Technical background
Dynamic vision transducer (DynamicVisionSensor, DVS) be a kind of New-type CMOS (ComplementaryMetalOxideSemiconductor, complementary metal oxide semiconductors (CMOS)) imageing sensor, the foundation structure of its pixel as shown in Figure 1, is made up of photodiode PD, logarithm pipe Mfb, amplifier A1, amplifier A2, electric capacity C1, electric capacity C2, switch RST, ON comparator, OFF comparator and logic module logic.Specific works mode is as follows:
Photodiode PD produces photoelectric current Iph because being subject to illumination, Iph is converted into corresponding photo signal voltage Vp by logarithm pipe Mfb.The effect of amplifier A1 is to form feedback loop, makes Vp can respond the change of Iph in time.The transforming relationship of Vp and Iph is
Wherein κ represents the sub-threshold slope factor of Mfb, and VS represents the source voltage of logarithm pipe Mfb, and UT represents thermal voltage, and I0 represents the constant reference current of photodiode PD.Electric capacity C1 and C2, amplifier A2 and switch RST form a switched capacitor amplifier.When switch RST disconnects, the changing value Δ Vdiff of amplifier out voltage Vdiff and the proportional change of changing value Δ Vp of amplifier in voltage Vp, namely have
Thus the situation of change of DVS energy Real-Time Monitoring Vp: if Δ Vdiff reaches set change threshold Vth, ON (being generally negative value), then ON comparator exports a pulse, is called and creates an ON event; If Δ Vdiff reaches set change threshold Vth, OFF (be generally on the occasion of), then OFF comparator exports a pulse, is called and creates an OFF event.When there being event to produce, logic module outgoing event control switch RST close, and removing event is gone forward side by side horizontal reset process.After reset completes, switch RST disconnects, and this periods of events completes, and DVS will start new round observation process.
As can be seen from the operation principle of above-mentioned DVS, traditional DVS only can realize monitoring the consecutive variations of photoelectric current thus the ON/OFF event pulse of its qualitative change of generation sign, and itself does not have the function being carried out by intensity signal quantizing to read.If require that DVS also can obtain intensity signal while the change of detection light intensity, then need in DVS dot structure, introduce extra quantification reading circuit.
Summary of the invention
For overcoming the deficiencies in the prior art, there is provided a kind of to adopt multiplexing structure to realize photoelectric current to monitor the transducer quantizing reading two kinds of functions with light intensity continuously, for this reason, the technical scheme that the present invention takes is, based on the dynamic vision transducer that amplifier is multiplexing, photodiode PD is connected with the source class of logarithm pipe Mfb, and between the grid level and source class of Mfb, add amplifier A1 formation negative feedback loop, is converted to voltage in logarithmic fashion for the photoelectric current detected by photodiode; The grid level of logarithm pipe Mfb is also connected with electric capacity C1, adds interrupteur SW 3 between electric capacity C1 and amplifier A2; Interrupteur SW 4 one end connects amplifier A2 input, and the other end then connects reference voltage Vref; Electric capacity C2 and reset switch SW2 is in parallel with amplifier A2 respectively, and electric capacity C3 is attempted by the two ends of amplifier A2 after connecting with interrupteur SW 1; The output of A2 is connected with OFF comparator with ON comparator respectively, and the output of ON comparator and OFF comparator all accesses in logic module Logic; Logic has five outputs, and the disconnection of control SW1 ~ SW5 is with closed respectively.
Each switch open and close sequential is that, in the incident detection stage, interrupteur SW 1, SW2, SW4 and SW5 are in off-state, and SW3 closes, and whether amplifier A2 is used for triggering being used for the time that judges after the amplification of light intensity variable signal; After event produces, SW3, SW4 and SW5 maintain the original state, SW1 and SW2 closes, and enters event resets process; After event resets process completes, SW2 disconnects, and the SW4 of SW3 disconnection simultaneously closes, and enters quantization stage, and the logarithm photoresponse voltage that now amplifier A2 is used for A1 feedback loop to obtain exports; Quantization stage continues some clock cycle, to ensure the foundation completely of amplifier output signal.At quantization stage end, SW5 closes, and reads the output signal of amplifier; After quantization stage terminates, SW4 and SW5 disconnects, SW2 and SW3 closes, thus enters into quantification reseting stage; At the end of quantizing to reset, SW1, SW2 disconnect, and complete the present event cycle, enter into the event detection process of next periods of events.
Compared with the prior art, technical characterstic of the present invention and effect:
1. adopt the transducer of amplifier multiplexing structure can not only Real-Time Monitoring change in optical signal, quantifications reading can also be carried out based on this structure to light signal.
2. transducer event detection process and quantize readout adopt be same photodiode input signal, avoid the deviation of signal that photoresponse nonuniformity is brought, eliminate the detection-quantization error of DVS pixel.
Accompanying drawing explanation
Fig. 1 tradition DVS dot structure figure.
Fig. 2 adopts multiplexing structure and the sequential chart carrying out the DVS pixel that light intensity quantification reads of amplifier.
Embodiment
The present invention passes through to increase port or the elements such as reference voltage, electric capacity and switch on traditional DVS architecture basics, and increase quantizes the course of work reading and quantize reset two amplifiers in a periods of events, make this DVS structure itself possess the ability of continuous intensity monitor and light intensity quantification output simultaneously.
Specifically describe as follows:
The dot structure that the present invention adopts and work schedule thereof are as shown in Figure 2.Pixel concrete structure is as follows: photodiode PD is connected with the source class of logarithm pipe Mfb, and between the grid level and source class of Mfb, add amplifier A1 formation negative feedback loop, is converted to voltage in logarithmic fashion for the photoelectric current detected by photodiode; Interrupteur SW 3 is added between electric capacity C1 and amplifier A2; Interrupteur SW 4 one end connects amplifier, and the other end then connects reference voltage Vref; C2 and reset switch SW2 is in parallel with amplifier A2 respectively, and electric capacity C3 is attempted by the two ends of amplifier A2 after connecting with interrupteur SW 1; The output of A2 is connected with OFF comparator with ON comparator respectively, and the output of two comparators all accesses in logic module Logic; Logic has five outputs, and the disconnection of control SW1 ~ SW5 is with closed respectively.
Represent when SW1 ~ SW5 is low level in sequential chart that this switch disconnects, for representing during high level that this switch closes.In the incident detection stage, interrupteur SW 1, SW2, SW4 and SW5 are in off-state, and SW3 closes, now consistent with event detection process in traditional DVS, and whether amplifier A2 is used for triggering being used for the time that judges after the amplification of light intensity variable signal.After event produces, SW3, SW4 and SW5 maintain the original state, SW1 and SW2 closes, and enters event resets process.After event resets process completes, SW2 disconnects, and the SW4 of SW3 disconnection simultaneously closes, and enters quantization stage, and the logarithm photoresponse voltage that now amplifier A2 is used for A1 feedback loop to obtain exports.Quantization stage continues some clock cycle, to ensure the foundation completely of amplifier output signal.At quantization stage end, SW5 closes, and reads the output signal of amplifier.After quantization stage terminates, SW4 and SW5 disconnects, SW2 and SW3 closes, thus enters into quantification reseting stage.At the end of quantizing to reset, SW1, SW2 disconnect, and complete the present event cycle, enter into the event detection process of next periods of events.
Because proposed method may have a lot of implementations, a more satisfactory scheme to be write here.
Be that example provides one embodiment of the present invention with 3.3V, 110nm manufacture craft.A designed clock cycle of imageing sensor is 20ns, and a periods of events is 160ns.Vref is 2.8V, C1 be 800fF, C2 be 50fF, C3 is 200fF, Vth, ON and Vth, and OFF is 40mV.
Claims (2)
1. one kind based on the multiplexing dynamic vision transducer of amplifier, it is characterized in that, electric diode PD is connected with the source class of logarithm pipe Mfb, and between the grid level and source class of Mfb, add amplifier A1 formation negative feedback loop, be converted to voltage in logarithmic fashion for the photoelectric current detected by photodiode; The grid level of logarithm pipe Mfb is also connected with electric capacity C1, adds interrupteur SW 3 between electric capacity C1 and amplifier A2; Interrupteur SW 4 one end connects amplifier A2 input, and the other end then connects reference voltage Vref; Electric capacity C2 and reset switch SW2 is in parallel with amplifier A2 respectively, and electric capacity C3 is attempted by the two ends of amplifier A2 after connecting with interrupteur SW 1; The output of A2 is connected with OFF comparator with ON comparator respectively, and the output of ON comparator and OFF comparator all accesses in logic module Logic; Logic has five outputs, and the disconnection of control SW1 ~ SW5 is with closed respectively.
2. as claimed in claim 1 based on the dynamic vision transducer that amplifier is multiplexing, it is characterized in that, each switch open and close sequential is, in the incident detection stage, interrupteur SW 1, SW2, SW4 and SW5 are in off-state, and SW3 closes, whether amplifier A2 is used for triggering being used for the time that judges after the amplification of light intensity variable signal; After event produces, SW3, SW4 and SW5 maintain the original state, SW1 and SW2 closes, and enters event resets process; After event resets process completes, SW2 disconnects, and the SW4 of SW3 disconnection simultaneously closes, and enters quantization stage, and the logarithm photoresponse voltage that now amplifier A2 is used for A1 feedback loop to obtain exports; Quantization stage continues some clock cycle, to ensure the foundation completely of amplifier output signal.At quantization stage end, SW5 closes, and reads the output signal of amplifier; After quantization stage terminates, SW4 and SW5 disconnects, SW2 and SW3 closes, thus enters into quantification reseting stage; At the end of quantizing to reset, SW1, SW2 disconnect, and complete the present event cycle, enter into the event detection process of next periods of events.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510579585.1A CN105163048A (en) | 2015-09-11 | 2015-09-11 | Dynamic vision sensor based on amplifier multiplexing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510579585.1A CN105163048A (en) | 2015-09-11 | 2015-09-11 | Dynamic vision sensor based on amplifier multiplexing |
Publications (1)
Publication Number | Publication Date |
---|---|
CN105163048A true CN105163048A (en) | 2015-12-16 |
Family
ID=54803790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201510579585.1A Pending CN105163048A (en) | 2015-09-11 | 2015-09-11 | Dynamic vision sensor based on amplifier multiplexing |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN105163048A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018176986A1 (en) * | 2017-03-30 | 2018-10-04 | 深圳大学 | Pixel unit and denoising method therefor, dynamic vision sensor and imaging apparatus |
WO2020063332A1 (en) * | 2018-09-29 | 2020-04-02 | 华为技术有限公司 | Dynamic vision sensor |
WO2020129435A1 (en) * | 2018-12-18 | 2020-06-25 | ソニーセミコンダクタソリューションズ株式会社 | Image sensor, recording device, and resetting method |
CN111770245A (en) * | 2020-07-29 | 2020-10-13 | 中国科学院长春光学精密机械与物理研究所 | Pixel structure of retina-like image sensor |
WO2021128534A1 (en) * | 2019-12-24 | 2021-07-01 | 清华大学 | Rod bionic vision sensor |
WO2021128533A1 (en) * | 2019-12-24 | 2021-07-01 | 清华大学 | Bimodal bionic vision sensor |
CN115696081A (en) * | 2018-09-07 | 2023-02-03 | 三星电子株式会社 | Image sensor including CMOS image sensor pixels and dynamic vision sensor pixels |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080089809A (en) * | 2007-04-02 | 2008-10-08 | (주)유우일렉트로닉스 | Readout circuit for uncooled infrared image detection |
CN103607546A (en) * | 2013-10-14 | 2014-02-26 | 天津市晶奇微电子有限公司 | Asynchronous CMOS pixel circuit with light adaptive threshold voltage adjustment mechanism |
WO2015036592A1 (en) * | 2013-09-16 | 2015-03-19 | Chronocam | Dynamic, single photodiode pixel circuit and operating method thereof |
CN104539857A (en) * | 2014-12-26 | 2015-04-22 | 电子科技大学 | Light current reading circuit and self-adaption light intensity imaging array circuit and control method thereof |
CN205051792U (en) * | 2015-09-11 | 2016-02-24 | 天津大学 | Developments vision sensor based on amplifier is multiplexing |
-
2015
- 2015-09-11 CN CN201510579585.1A patent/CN105163048A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080089809A (en) * | 2007-04-02 | 2008-10-08 | (주)유우일렉트로닉스 | Readout circuit for uncooled infrared image detection |
WO2015036592A1 (en) * | 2013-09-16 | 2015-03-19 | Chronocam | Dynamic, single photodiode pixel circuit and operating method thereof |
CN103607546A (en) * | 2013-10-14 | 2014-02-26 | 天津市晶奇微电子有限公司 | Asynchronous CMOS pixel circuit with light adaptive threshold voltage adjustment mechanism |
CN104539857A (en) * | 2014-12-26 | 2015-04-22 | 电子科技大学 | Light current reading circuit and self-adaption light intensity imaging array circuit and control method thereof |
CN205051792U (en) * | 2015-09-11 | 2016-02-24 | 天津大学 | Developments vision sensor based on amplifier is multiplexing |
Non-Patent Citations (1)
Title |
---|
于璐等: "一种基于地址-事件表达的实时视觉传感器实现方法", 《光学学报》 * |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018176986A1 (en) * | 2017-03-30 | 2018-10-04 | 深圳大学 | Pixel unit and denoising method therefor, dynamic vision sensor and imaging apparatus |
US12081889B2 (en) | 2018-09-07 | 2024-09-03 | Samsung Electronics Co., Ltd. | Image sensor including CMOS image sensor pixel and dynamic vision sensor pixel |
CN115696081A (en) * | 2018-09-07 | 2023-02-03 | 三星电子株式会社 | Image sensor including CMOS image sensor pixels and dynamic vision sensor pixels |
US11310445B2 (en) | 2018-09-29 | 2022-04-19 | Huawei Technologies Co., Ltd. | Dynamic vision sensor |
WO2020063332A1 (en) * | 2018-09-29 | 2020-04-02 | 华为技术有限公司 | Dynamic vision sensor |
WO2020129435A1 (en) * | 2018-12-18 | 2020-06-25 | ソニーセミコンダクタソリューションズ株式会社 | Image sensor, recording device, and resetting method |
CN112369012A (en) * | 2018-12-18 | 2021-02-12 | 索尼半导体解决方案公司 | Image sensor, recording apparatus, and reset method |
CN112369012B (en) * | 2018-12-18 | 2024-04-12 | 索尼半导体解决方案公司 | Image sensor, recording apparatus, and reset method |
WO2021128534A1 (en) * | 2019-12-24 | 2021-07-01 | 清华大学 | Rod bionic vision sensor |
WO2021128533A1 (en) * | 2019-12-24 | 2021-07-01 | 清华大学 | Bimodal bionic vision sensor |
US11943550B2 (en) | 2019-12-24 | 2024-03-26 | Tsinghua University | Dual-modality neuromorphic vision sensor |
CN111770245B (en) * | 2020-07-29 | 2021-05-25 | 中国科学院长春光学精密机械与物理研究所 | Pixel structure of retina-like image sensor |
CN111770245A (en) * | 2020-07-29 | 2020-10-13 | 中国科学院长春光学精密机械与物理研究所 | Pixel structure of retina-like image sensor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105163048A (en) | Dynamic vision sensor based on amplifier multiplexing | |
JP4825982B2 (en) | Solid-state imaging device and signal readout method thereof | |
US7375751B2 (en) | CMOS image sensor | |
US9686483B2 (en) | Pixel with switchable high gain and high capacity modes | |
JP2009543454A (en) | Mixed analog and digital pixels for high dynamic range readout | |
WO2019019589A1 (en) | Active pixel sensor and driving method thereof, imager, and electronic device | |
EP2816602A2 (en) | A photoelectric conversion device | |
CN103856730A (en) | Ultraviolet focal plane readout circuit and method based on pixel level analog-to-digital conversion | |
CN205051792U (en) | Developments vision sensor based on amplifier is multiplexing | |
JPWO2007088710A1 (en) | Photodetector | |
JP6175355B2 (en) | Solid-state image sensor | |
CN105282460A (en) | Enhanced dynamic range reading method and circuit having offset cancellation | |
CN104251739A (en) | Single-capacitor correlated dual-sampling uncooled infrared reading circuit | |
CN106330105A (en) | High-linearity dynamic range photoelectric sensor applied to blood oxygen detection | |
US10070089B2 (en) | Inverting amplifier, integrator, sample hold circuit, ad converter, image sensor, and imaging apparatus | |
CN104243867A (en) | CMOS image sensor with high pixel and high frame rate and image collecting method | |
CN105706361A (en) | Amplifier adapted for CMOS imaging sensors | |
CN100568915C (en) | The equipment and the method that are used for the suitable variable gain A/D conversion of imageing sensor | |
CN103365326A (en) | Average voltage generation circuit and method for providing reference voltage for pixel array | |
US20100238335A1 (en) | Clamp circuit and solid-state image sensing device having the same | |
US20080088716A1 (en) | System and method for providing automatic gain control in an imaging device | |
CN107484293B (en) | Great power LED attenuation compensation integrated circuit | |
CN106027921A (en) | PWM (Pulse Width Modulation) digital pixel sensor with adaptive reference voltage and large dynamic range | |
CN103134529A (en) | Photoelectric sensor | |
CN102095501A (en) | IRFPA (Infrared Focal Plane Array) and read-out circuit thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151216 |
|
WD01 | Invention patent application deemed withdrawn after publication |