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Proceedings Paper

Auto-adaptative LSB technique for in-pixel analog to digital conversion
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Paper Abstract

This paper firstly presents an asynchronous analog to digital technique that is well suited for an in-pixel implementation in an X-ray or Infra-Red image sensor. The principle which consists in counting charge packets coming from the detector is also called "charge-balancing technique". Simulation and experimental results on a 0.13μm process test-chip are given and a 16 bit dynamic range is reached. Secondly a new enhancement method is described. This method controls the LSB of the A/D conversion as the input current (from the detector) varies, so that a floating point coding is carried out. The consequences are a wider dynamic range (19 bits at least) as well as a reduction of the technological fluctuations between two different pixels. On this work in progress, implementation in a 150x150μm2 pixel is briefly commented.

Paper Details

Date Published: 29 February 2008
PDF: 11 pages
Proc. SPIE 6816, Sensors, Cameras, and Systems for Industrial/Scientific Applications IX, 68160S (29 February 2008); doi: 10.1117/12.782525
Show Author Affiliations
Arnaud Peizerat, CEA/LETI Minatec (France)
Amélie Martin, CEA/LETI Minatec (France)
Michael Tchagaspanian, CEA/LETI Minatec (France)
Valérie Nguyen, CEA/LETI Minatec (France)

Published in SPIE Proceedings Vol. 6816:
Sensors, Cameras, and Systems for Industrial/Scientific Applications IX
Morley M. Blouke; Erik Bodegom, Editor(s)

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