Abstract
A dark current compensation technique for low-light image sensors is presented in this work. A multi-branch differential integrator circuit is proposed to compensate the effect of dark current in CMOS image sensors. In order to obtain a low level sensing application, a T-type switch with low leakage current is used. The new configuration of multiple-input multiple-output differential amplifier has the advantage of carefully managing the femto-ampere range dark currents of photodiode. The high-sensitivity active-pixel CMOS image sensor using a standard TSMC CMOS 0.18 µm fabrication process has been obtained.
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