Modelo para escolha de topologias de sensores de pixeis ativos logarítmicos adequadas para implementação de sensores de imagem com largo alcance dinâmico

Abstract

This work presents a study on the behavior and effectiveness of different Fixed-Pattern Noise (FPN) reduction techniques applied to different pixel topologies operating in logarithmic mode. The purpose of such study is the establishment of a consistent way to perform fair cross comparison of the effectiveness of different FPN attenuation techniques applied to pixels with different topologies and designed in the same technological node, and thus establish judgment criteria for determining which topology will be most suitable for implementation of an image sensor operating in logarithimic mode. Investigations of the effectiveness of two similar FPN reduction techniques applied to four different pixel topologies were performed through Monte Carlo simulations. The analyses of results of output signal swing, total and residual FPN, signal-to-distortion ratio, power consumption and fill factor are able to demonstrate which pixel topologies yield better results in each of these criteria. Such results provide valuable data that allows a more concise decision on which pixel topology and FPN reduction technique to choose in the design of an imager array with wide dynamic range.