320×256大电荷容量的长波红外读出电路结构设计

长波红外探测器存在暗电流大、背景高的特点，需要设计大电荷容量的读出电路。采用分时共享积分电容的电路结构，在面阵焦平面的有限单元面积中设计了一种高读出效率、大电荷容量的320256长波红外焦平面读出电路。电路输入级采用电容反馈跨阻放大器（CTIA）结构，具有注入效率高、噪声低、线性度好的特点。基于CSMC 0.35 m标准CMOS工艺模型进行了模拟仿真以及版图设计完成后的后端仿真，电路输出电压范围大于2 V，非线性小于1%，帧频为100 f/s,采用分时共享积分电容电路结构后，像元有效电荷容量达到57.5 Me-/像元。

320×256 LW IRFPA ROIC with large charge capacity

The long-wave infrared detectors present the characteristics of large dark current, high background, large charge capacity readout circuit was need to design. A designing scheme of a high readout efficiency and large charge capacity readout circuit for 320256 LW infrared focal plane arrays(IRFPAs) in the finite cell area of FPAs was proposed by adopting the circuit structure of time-shared the integrating capacitor. The input stage circuit used the capacitor feedback transimpedance amplifier (CTIA) preamplifier structure, which has a high injection efficiency, low noise and good linearity. The simulation and the simulation after completing the layout were carried out based on CSMC 0.35 m standard CMOS process model, the output swings of circuit were larger than 2 V and the nonlinearity is less than 1%, the frame rate is 100 f/s, after adopting the circuit structure of the time-shared integrating capacitor, the effective charge capacity reached 57.5 Me-/pixel.