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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320×256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 0.35μm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。
Long-wave infrared detectors exist dark current, high background characteristics, the need to design a large charge-capacity readout circuit. By using the circuit structure of time sharing shared capacitor, a 320 × 256 long-wave infrared focal plane readout circuit with high read efficiency and large charge capacity was designed in the finite area of focal plane of the area array. The circuit input stage adopts the capacitive feedback transimpedance amplifier (CTIA) structure, which has the characteristics of high injection efficiency, low noise and good linearity. The CSMC 0.35μm standard CMOS process model is used to simulate the simulation and the back-end simulation after the layout design is completed. The output voltage range of the circuit is greater than 2 V, the nonlinearity is less than 1%, the frame rate is 100 f / s, After the circuit structure, the effective charge capacity of the cell reaches 57.5 Me- / pixel.