New CMOS readout circuit with dark current suppression and novel CDS structure for large format QWIP FPA

A novel Correlated-double-sampling (CDS) structure based on dynamic source-follower and a new Dark current suppression (DCS) CMOS readout circuits for large format Quantum-well-infrared photo-detector (QWIP) Focal-plane-array (FPA) are proposed, which can overcome the drawbacks of the present techniques, such as sensitivity to the non-uniformity of the QWIP materials, poor readout noise features, low frame frequency, limited injection efficiency and dynamic range, etc. Through the novel CDS structure, the output wave form is boxcar, and the frame frequency increased. Simulation results demonstrate that, the proposed DCS circuit can suppress the dark current, and achieve good readout performance, such as low power consumption, high charge sensitivity, high resolution, large dynamic range, and insensitivity to the non-uniformity of the QWIP materials etc.