摘要
设计了一种高性能电容反馈跨阻放大器(CTIA)与相关双采样电路(CDS)相结合的红外探测器读出电路。该电路采用CTIA电路实现对微弱电流信号的高精度读出,并通过CDS电路抑制CTIA引入的固定模式噪声(FPN),最后采用失调校正技术减小CDS引入的失调,从而减小了噪声对电路的影响,提高了读出电路的精度。采用特许半导体(Chartered)0.35μm标准CMOS工艺对电路进行流片,测试结果表明:在20pA～10nA范围内该电路功能良好,读出精度可达10bit以上,线性度达97%,达到了设计要求。该读出电路可用于长线列及面阵结构红外探测系统。
A kind of readout integrated circuit （ROIC） for long linear IR detectors, composed of capacitor feedback trans-impedance amplifier （CTIA） and correlated double sample （CDS） circuit, was proposed. The readout accuracy of weak current signal was obviously improved by the CTIA circuit. Besides,in order to reduce the fixed patten noise （FPN） induced by CTIA, CDS circuit with offset calibration technique was utilized. By employing the above techniques, the influence of noise on this circuit was greatly reduced. Meanwhile the precision of the ROIC was improved. The final ROIC chip was fabricated with Chartered 0.35μm standard CMOS processing. Test results show that the readout accuracy could reach up to 10 bit during the current varied from 20 pA to 10 nA, and the linearity could reach up to 97%, which was in perfect accordance with the specification. The ROIC could be applied in long linear and staring array IR detectors systems.
出处
《红外与激光工程》
EI
CSCD
北大核心
2009年第5期787-791,共5页
Infrared and Laser Engineering
基金
国家自然科学基金资助项目(60806010)
