CMOS correlated-double-sampling and hold structure based on novel dynamic source-follower for large format infrared focal-plane-array

摘要

In this paper, a CMOS correlated double sampling and hold (CDSH) structure based on novel dynamic source follower for large format infrared focal-plane array (IRFPA) is proposed. The primary noise (fixed-pattern noise (FPN) and KTC reset noise, etc) of the CMOS image sensor is reduced, through the improved CDSH structure based on the novel dynamic source follower, and all pixels in the selected row can start integrating simultaneously; the readout process happens in the next row selection time, which can increase the frame frequency, and the output waveform is boxcar, which is easy-to-realize analog/digital conversion. SPICE simulation results have shown that the proposed improved CDSH structure can achieve the advantages of simple driving signal, large dynamic range in large format IRFPA with low power consumption.