Design of An Infrared Focal Plane Special Shaped Readout Circuit with High Sensitivity and Dynamic Range
We designed a new type of infrared focal plane readout circuit with combined pixels to meet the development requirements of both high sensitivity and high dynamic range.The designed circuit can be used for shortwave infrared focal plane detector arrays.Traditional pixels typically use only one input stage,which makes it difficult to balance high sensitivity and high dynamic range.In contrast,combined pixels use a capacitive trans-impedance amplifier(CTIA)input stage along with a high dynamic range input stage,thereby inheriting their advantages.The specific layout of a combined pixel contains one high-dynamic-range input stage located in the middle of every 2×2 CTIA high-sensitivity input stage.This high dynamic range input stage can be switched between direct injection and logarithmic modes.We realized the layout of a 320X256 readout circuit for combined pixel arrays with a 15 μm pitch using a 0.18 μm 3.3 V standard CMOS process.Simulation results show that both high sensitivity and a high dynamic range can be achieved using small integral capacitors and a high dynamic range in combination with the logarithmic mode.
combined pixelsROIChigh sensitivityhigh dynamic range
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