Publication

An event-detection high dynamic range CMOS image sensor

Giovanni De Micheli, Sandro Carrara, Yusuf Leblebici, Gözen Köklü
2013
Conference Papers

Abstract

A novel CMOS image sensor is proposed to overcome the analog design limitations in Active Pixel Sensors - APS and large area overcome in Digital Pixel Sensors - DPS for use in bio-medical applications. The design includes a pixel level event generation mechanism by using a binary search technique. A ramp voltage generated by a combined block of 10-bit counter and DAC Digital to Analog Converter is compared with the pixel integrated voltage at each clock cycle at the same time allowing a fixed exposure time interval. The proposed design arrives to a total pixel array area of 1505.62μm × 4566μm for a pixel array size of 160(Zf) × 120(V). The photo-active area in each pixel is considered as the N-well area in a p002B;/n-well/p-sub type photo-transistor corresponding to a size of 11.24μm × 10.76μm. The overall pixel array reaches a fill factor of %34.

Official source

https://infoscience.epfl.ch/entities/publication/1b6feb58-6639-4072-8e45-51b8d7d0f6cb

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Giovanni De Micheli, Sandro Carrara, Yusuf Leblebici, Gözen Köklü
2013
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1b6feb58-6639-4072-8e45-51b8d7d0f6cb

About this result

Related concepts (21)

Active-pixel sensor

An active-pixel sensor (APS) is an , which was invented by Peter J.W. Noble in 1968, where each pixel sensor unit cell has a photodetector (typically a pinned photodiode) and one or more active transistors. In a metal–oxide–semiconductor (MOS) active-pixel sensor, MOS field-effect transistors (MOSFETs) are used as amplifiers. There are different types of APS, including the early NMOS APS and the now much more common complementary MOS (CMOS) APS, also known as the CMOS sensor.

Pixel

In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, pixels are the smallest element that can be manipulated through software. Each pixel is a sample of an original or synthetic image; more samples typically provide more accurate representations of the original. The intensity of each pixel is variable.

Image sensor

An image sensor or imager is a sensor that detects and conveys information used to form an . It does so by converting the variable attenuation of light waves (as they pass through or reflect off objects) into signals, small bursts of current that convey the information. The waves can be light or other electromagnetic radiation. Image sensors are used in electronic imaging devices of both analog and digital types, which include digital cameras, camera modules, camera phones, optical mouse devices, medical imaging equipment, night vision equipment such as thermal imaging devices, radar, sonar, and others.

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