CEA-Leti and EPFL Pre-Announces 0.5e- Noise Pixel

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CEA-Leti and EPFL pre-announces its paper on fast and low noise image sensor based on thin-oxide pmos SF, to be published in September issue of JSSC:

A Sub-0.5 Electron Read Noise VGA Image Sensor in a Standard CMOS Process

Boukhayma, Assim; Enz, Christian; Peizerat, Arnaud


A sub-0.5e−rms temporal read noise VGA (640H×480V) CMOS image sensor has been integrated in a standard 0.18μm 4PM CMOS process. The low noise performance is achieved exclusively through circuit optimization without any process refinements. The presented imager relies on a 4T pixel of 6.5μm pitch with a properly sized and biased thin oxide PMOS source follower. A full characterization of the proposed image sensor, at room temperature, is presented. With a pixel bias of 1.5μA the sensor chip features an input-referred noise histogram from 0.25 e−rms to a few e−rms peaking at 0.48 e−rms. The imager features a full well capacity of 6400 e− and its frame rate can go up to 80 fps. It also features a fixed pattern noise as low as 0.77%, a lag of 0.1% and a dark current of 5.6e-/s. It is also shown that the implementation of the in-pixel n-well does not impact the quantum efficiency of the pinned photo-diode.

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