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

Arnaud Peizerat; Amélie Martin; Michael Tchagaspanian; Valérie Nguyen

doi:10.1117/12.782525

29 February 2008 Auto-adaptative LSB technique for in-pixel analog to digital conversion

Arnaud Peizerat, Amélie Martin, Michael Tchagaspanian, Valérie Nguyen

Proceedings Volume 6816, Sensors, Cameras, and Systems for Industrial/Scientific Applications IX; 68160S (2008) https://doi.org/10.1117/12.782525
Event: Electronic Imaging, 2008, San Jose, California, United States

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.

Citation Download Citation

Arnaud Peizerat, Amélie Martin, Michael Tchagaspanian, and Valérie Nguyen "Auto-adaptative LSB technique for in-pixel analog to digital conversion", Proc. SPIE 6816, Sensors, Cameras, and Systems for Industrial/Scientific Applications IX, 68160S (29 February 2008); https://doi.org/10.1117/12.782525

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