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Current Mode Image Sensor With Improved Linearity and Fixed-Pattern Noise
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DOI：10.1109/TCSI.2013.2295009.png)
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Abstract
En 中文
Currentmode active pixel sensors convert light intensity into an analog output current. A current mode image sensor enables simple implementation of focal plane algebraic functions but suffers from poor linearity and large fixed-patten noise. This paper analyzes the causes of the non-linearity of a current-mode image sensor including a theoretical derivation and numerical simulation. Previously reported linearity improvement methods are reviewed, while an architecture of a current mode image sensor with a voltage feedback loop between pixel output and the current conveyor for linearity enhancement is proposed. An image sensor array of 100 x 200 current mode pixels is fabricated in a 0.5 mu m 2P3M standard CMOS processing technology. Experimental results illustrate a 45% improvement of the linearity of the proposed imager. Fixed pattern noise is reduced by 57.6% for the maximum readout current, which can be further reduced by another 51.5% after gain calibration. A signal to noise ratio of 49.6 dB is achieved.
Keywords:
Current mode image sensor
fixed-pattern noise
linear response
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