基于电流镜积分的红外探测器读出电路设计

摘要

By analyzing the working principle and noise of current mirroring integration(CMl) readout circuit, a CMl structure is designed here. The CMI readout circuit is simulated and implemented using CSMC 0.5 μm CMOS integrated technology. The simulated results show that the circuit provides a maximum charge storage capacity of 6.25×107 electrons for a 2pF integration capacitance and 5 V power supply,the detector bias voltage is stable at 3.615 mV for 50 pA detector current, and the noise of the designed CMl circuit is 3. 451 nsqV/Hz for 1 kHz frequency, even more, the structure has a large linearity no less than 99％ in integration and two paths of differential output circuit.%详细分析了电流镜积分(CMI)读出电路的工作原理、设计过程和CMI结构的噪声,并用CSMC 0.5μm CMOS工艺对所设计的电路进行仿真和版图设计,仿真结果表明CMI结构在电源电压为5 V,积分电容为2 pF时能提供一个较大的电荷存储能力(6.25x107个电子);在光生电流为50 pA时,探测器偏压稳定在3.615 mV;在频率为1 kHz时噪声为3.451 mqV/Hz;读出电路在积分和两路差分输出线性度不低于99%.