非均匀性校正的长波光导探测器读出电路设计

在航天遥感领域，波长在10m以上的长波探测器仍以HgCdTe光导型探测器为主，在红外探测成像方面发挥着重要作用。非均匀性是目前长波光导探测器突出的问题之一，设计了一种数模混合的非均匀性校正的长波光导探测器读出电路。该电路不仅可以有效地解决线列长波光导探测器电阻非均匀性问题，还可以增大ROIC输出信号的动态范围，几乎不增加读出电路功耗。经过仿真测试表明:非均匀性问题有了明显的改善，能够使其非均匀性降为0.5%以内，在常温和低温下都能正常工作。该校正电路不仅能解决当前工程中的关键问题，还对今后高性能大面阵长波光导探测器读出电路的设计具有重要的指导意义。

Design of ROIC for long wave photoconductive detector with nonuniformity correction

In the field of space remote sensing, the long wave detector with wavelength of 10 m or more is mainly based on HgCdTe photoconductive(PC) detector, which plays an important role in IR imaging. Nonuniformity is one of the outstanding problems in the long wave PC detector. A new type of long wave PC detector read-out integrated circuit(ROIC) in digital-analog mixed mode with nonuniformity correction was designed. The circuit could not only effectively solve nonuniformity of the linear long wave PC detector in resistance, but also increase the dynamic range of the output signal of the ROIC with almost no increase in power consumption. Simulation results show that the nonuniformity is greatly improved through the correction ROIC, which makes the nonuniformity reduce to less than 0.5%, and it can work at room temperature and low temperature. The correction circuit could not only solve the key problems in current project, but also have guiding significance for circuit future design of high performance large array IR detector.