Mode detection of a linear-logarithmic current-mode image sensor

Khamsehashari, Elham; Audet, Yves

doi:10.1109/newcas.2011.5981203

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…So, the comparator output should be "1". However, in the logarithmic mode of operation, the comparator output changes to "0" since two consecutive I oDRS readout would be nearly identical [16].…”

Section: The Mode Indicator Column Circuitsmentioning

confidence: 99%

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Response Mode Detection of a Linear-Logarithmic Image Sensor Using a Current-Mode Readout Circuit

Khamsehashari

Audet

2013

CSSP

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A current-mode image sensor architecture using a linear-logarithmic pixel in order to improve the dynamic range is presented. The pixel cell is based on a 3T active pixel structure with a PMOS readout transistor in the linear region of operation and a PMOS reset transistor that allows for a linear-logarithmic response. An intrascene dynamic range of 90dB is obtained with a pixel fill factor of 37%. The readout circuit is composed of a first-generation current conveyor, a current memory employed as a delta reset sampling unit, a differential amplifier used as an integrator and a dynamic comparator. The pixel response operating mode is determined in the column readout. A signal is sent to the digital processing unit as an indicator to determine the pixel response operating mode in order to allow the proper analog to digital conversion. The image lag effect observed in the pixel output current is removed by the delta reset sampling circuit. Experimental results, obtained from a test structure, are presented. The circuit was fabricated in a CMOS 0.35um process from Austria Microsystems.

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Section: The Mode Indicator Column Circuitsmentioning

confidence: 99%

“…Part of this work has been reported in the IEEE NEWCAS conference proceedings [15][16], new key experimental results are presented to complete this work. This paper is organized as follow.…”

Section: Introductionmentioning

confidence: 99%

Response Mode Detection of a Linear-Logarithmic Image Sensor Using a Current-Mode Readout Circuit

Khamsehashari

Audet

2013

CSSP

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Optimization Methodology for a 460-MHz-GBW and 80-dB-SNR Low-Power Current-Mode Amplifier

Ferreira

Kolar

Bénabès

2015

Proceedings of the 28th Symposium on Integrated Circuits and Systems Design

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Mode detection of a linear-logarithmic current-mode image sensor

Cited by 2 publications

References 8 publications

Response Mode Detection of a Linear-Logarithmic Image Sensor Using a Current-Mode Readout Circuit

Response Mode Detection of a Linear-Logarithmic Image Sensor Using a Current-Mode Readout Circuit

Optimization Methodology for a 460-MHz-GBW and 80-dB-SNR Low-Power Current-Mode Amplifier

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