A Biologically Inspired CMOS Image Sensor by Mukul Sarkar

By Mukul Sarkar

Biological platforms are a resource of thought within the improvement of small self reliant sensor nodes. the 2 significant different types of optical imaginative and prescient structures present in nature are the one aperture human eye and the compound eye of bugs. The latter are one of the so much compact and smallest imaginative and prescient sensors. the attention is a compound of person lenses with their very own photoreceptor arrays. The visible approach of bugs permits them to fly with a constrained intelligence and mind processing strength. A CMOS photo sensor replicating the conception of imaginative and prescient in bugs is mentioned and designed during this publication for commercial (machine imaginative and prescient) and clinical purposes.

The CMOS steel layer is used to create an embedded micro-polarizer capable of feel polarization details. This polarization info is proven to be important in functions like actual time fabric type and independent agent navigation. additional the sensor is provided with in pixel analog and electronic stories which permit version of the dynamic diversity and in-pixel binarization in actual time. The binary output of the pixel attempts to copy the flickering impact of the insect’s eye to discover smallest attainable movement according to the switch in kingdom. An built in counter counts the adjustments in states for every row to estimate the path of the movement. The chip includes an array of 128x128 pixels, it occupies a space of five x four mm2 and it's been designed and fabricated in an 180nm CMOS CIS strategy from UMC.

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17 Angle to position transformation: (a) Mapping of a sphere onto a square. (b) Angles phi (ϕ) and theta (θ) for the center directions of angles of incidence for the first nine channels. 2. Thus the contact angle will define the F-number of the micro-lens fabricated. The technological problem of mapping the spherical world onto the planar photodetector surface is solved by dividing the detector plane into 25 zones and an array of 5 x 5 micro-lenses covering all the zones. Each zone has a total FOV of near 25°, and capture the light from certain angles with a resolution of 1°, while there are 25 x 25 pixels under each micro-lens.

This reduces cost of supporting circuitry required, camera complexity, and also power consumption. The CMOS image sensors need lower voltage than the CCD sensors, and thus lower power consumption. The CMOS image sensors also allows for random access and thus region based readout is possible, allowing the CMOS image sensors to operate at very high speeds. The CMOS image sensors are easily capable of running at over 500 frames per second at megapixel resolution. In the recent years, the CMOS image sensors have become dominant and are being used in many applications like, automobiles, digital camera, surveillance systems etc.

16. In the first step of the thermal reflow method, a photo-layer is spin-coated onto the substrate and and it is then exposed by ultraviolet light. The photo-resist layer is then developed and cylindrical isolated array pattern is formed. These cylindrical structures are then heated till they melt and turn into spherical structures. 16, is a key parameter which determines the quality of the spherical micro-lens produced using thermal reflow method. 16, the contact angle is given by 38 2 Natural and Artificial Compound Eye Ultraviolet light mask Photoresist layer substrate Photoresist cyclinders substrate Photoresist spheres substrate   Fig.

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