用于红外焦平面读出电路的新型输出缓冲器  

A novel output buffer for IRFPA ROIC

作　　者：陈力颖[1,2] 张思敏 李晓云 王浩[1,2] 杨依林 CHEN Li-ying;ZHANG Si-min;LI Xiao-yun;WANG Hao;YANG Yi-lin(Tianjin university of technology,Tianjin,300387,China;Tianjin Key Laboratory of Photoelectric Detection Technology and System,Tianjin 300387,China)

机构地区：[1]天津工业大学电子与信息工程学院,天津300387 [2]天津市光电检测技术与系统重点实验室,天津300387

出　　处：《光电子．激光》2021年第4期356-360,共5页Journal of Optoelectronics·Laser

基　　金：中国国家留学基金资助(201908120039);天津市自然科学基金项目(19JCTPJC48000);天津市研究生科研创新项目(2019YJSS019)资助项目。

摘　　要：根据红外焦平面读出电路输出缓冲器的大输出摆幅和大压摆率的特点,设计了一种应用于红外焦平面读出电路的新型输出缓冲器,由于输出缓冲器需要一个较大的输出摆幅,所以采用轨对轨输入以及AB类输出的全差分运放,使其在不损失增益的情况下提高带宽和输出摆幅;并在轨对轨结构中插入恒定跨导电路,使电路更加稳定;在输出缓冲器高压摆率的要求下,输出级插入压摆率提高电路,使电路达到更好的性能。该输出缓冲器采用TSMC 0.18μm CMOS工艺,50pF电容负载、100kΩ电阻负载,5V工作电压。仿真结果表明,在输入摆幅1~4.8V的情况下输出摆幅能到达1~4.8V,增益能达到100.34dB,带宽为58MHz,正负压摆率分别为89V/μs、-92V/μs,其他仿真结果也均满足缓冲器的设计要求。According to the characteristics of the output buffer of IRFPA readout circuit with large output swing and large voltage swing rate,a new output buffer for IRFPA readout circuit is designed.Because the output buffer needs a large output swing,the full differential operational amplifier with rail to rail input and class AB output is adopted to improve the bandwidth and output without loss of gain In order to make the circuit more stable,a constant transconductance circuit is inserted into the rail to rail structure to make the circuit more stable;under the requirement of high swing rate of output buffer,the voltage swing rate is inserted into the output stage to improve the circuit performance.The output buffer adopts TSMC 0.18μm CMOS process,50 pF capacitance load,100 kΩresistance load and 5 V working voltage.The simulation results show that when the input swing is 1~4.8 V,the output swing can reach 1~4.8 V,the gain can reach 100.34 dB,the bandwidth is 58 MHz,and the positive and negative voltage swing rates are 89 V/μs and-92 V/μs,respectively.

关 键 词：读出电路 输出缓冲器 恒定跨导 大压摆率 

分 类 号：TN432[电子电信—微电子学与固体电子学]