Self-adaptive ROIC for long-wave length photoconductive infrared detector

Long-wave photoconductive infrared detector (wavelength over 10 μm) is important to the fields of low-temperature target detection, over-the-horizon detection, and anti-jamming target recognition. The readout integrated circuit of long-wave infrared photoconductive detector cannot adapt because of its low resistance and high non-uniformity. A self-adaptive readout integrated circuit for correction of long-wave infrared photoconductive detector is designed. The circuit adopts a bridge input structure with feedback comparison type ADC and DAC, and then outputs through RTIA amplifier. It can not only effectively readout the signal of the long-wave photoconductive detector with non-uniformity, but also increase the dynamic range of the output signal of the readout integrated circuit. The simulation and test show that the non-uniformity has been improved evidently. The non-uniformity of resistance is reduced to less than 0.5 % equivalently, and the non-uniformity of output signal is reduced from more than 50 % to less than 10 %. The circuit can work properly at normal temperature and low temperature. It has the advantages of low power consumption and low noise. This correction circuit can not only solve the key problems in current projects but also lay an important theoretical foundation for the design and development of the readout integrated circuit of high-performance and large array of long-wave photoconductive infrared detector in the future.