Dynamic vision sensor based on amplifier multiplexing
A technology of visual sensor and amplifier, applied in the direction of TV, color TV, color TV components, etc., can solve the problem of not having quantitative readout of light intensity information, and achieve the effect of eliminating detection-quantization error and avoiding signal deviation.
Inactive Publication Date: 2015-12-16
TIANJIN UNIV
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[0008] From the above working principle of DVS, it can be seen that the traditional DVS can only monitor the continuous change of photocurrent to generate ON / OFF event pulses that characterize its changing nature, but it does not have the function of quantifying and reading out the light intensity information itself.
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[0016] Based on the traditional DVS structure, the present invention adds reference voltages, capacitors, switches, and other ports or components, and increases the working processes of two amplifiers, quantized readout and quantized reset, in one event cycle, so that the DVS structure itself has continuous light. Strong monitoring and light intensity quantification output capabilities.
[0017] The specific description is as follows:
[0018] The pixel structure and its working sequence used in the present invention are as figure 2 Shown. The specific structure of the pixel is as follows: the photodiode PD is connected to the source of the logarithmic tube Mfb, and an amplifier A1 is added between the gate and the source of the Mfb to form a negative feedback loop, which is used to counter the photocurrent detected by the photodiode. Switch SW3 is added between capacitor C1 and amplifier A2; one end of switch SW4 is connected to the amplifier, and the other end is connected to ...
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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 [0001] The invention relates to the field of integrated circuits, and in particular to a dynamic vision sensor that adopts an amplifier multiplexing mode for light intensity quantitative readout. Specifically, it involves a dynamic vision sensor based on amplifier multiplexing. technical background [0002] Dynamic vision sensor (DynamicVisionSensor, DVS) is a new CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor) image sensor, the basic structure of its pixels such as figure 1 As shown, it is composed of photodiode PD, logarithmic tube Mfb, amplifier A1, amplifier A2, capacitor C1, capacitor C2, switch RST, ON comparator, OFF comparator and logic module logic. The specific working methods are as follows: [0003] The photodiode PD generates a photocurrent Iph due to light exposure, and Iph is converted into a corresponding light signal voltage Vp through the logarithmic tube Mfb. The function of the amplifier A1 is to form a n...
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IPC IPC(8): H04N5/374
CPCH04N25/47
Inventor 徐江涛邹佳伟高志远聂凯明高静史再峰
Owner TIANJIN UNIV