基于SiGe BiCMOS工艺的高速光接收机模拟前端电路  

Analog Front-End Circuit for High-Speed Optical Receiver Based on SiGe BiCMOS Technology

作　　者：谢生 谷由之 毛陆虹 吴思聪 高谦 Xie Sheng;Gu Youzhi;Mao Luhong;Wu Sicong;Gao Qian(Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology,School of Microelectronics,Tianjin University,Tianjin 300072,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学微电子学院天津市成像与感知微电子技术重点实验室,天津300072 [2]天津大学电气自动化与信息工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2018年第1期57-63,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(61474081)~~

摘　　要：基于IBM 0.18,μm SiGe BiCMOS工艺,设计了一款12.5,Gb/s的全差分光接收机模拟前端电路.该电路由跨阻放大器、限幅放大器、直流偏移消除电路和输出缓冲级组成.为获得更高的带宽,本文对Cherry-Hooper结构进行了改进,设计出一种三级级联的限幅放大器,而直流偏移消除电路则使用了差分有源密勒电容(DAMC)来替代传统的片外大电容,提高了电路集成度和稳定性.版图后仿结果表明,在探测器等效电容为300,f F的情况下,光接收机前端电路的跨阻增益为97,d B,-3,d B带宽为11.7,GHz,等效输入噪声电流小于14.2,pA/Hz^(1/2),芯片核心面积为720,μm×700,μm.A fully differential analog front-end circuit for12.5,Gb/s optical receiver was optimally designed with IBM0.18,μm SiGe BiCMOS technology,which included transimpedance amplifier(TIA),limiting amplifier(LA),DC offset cancellation(DOC)circuit and output buffer.To obtain wider bandwidth,the Cherry-Hooper structure was modified,and a cascaded limiting amplifier with three-stage Cherry-Hooper structures was proposed.Additionally,the DOC circuit adopted a differential active Miller capacitor(DAMC)to replace the traditional large off-chip capacitors,which was beneficial for improving the integration level and stability.Post-layout simulation results showed that the optical receiver front-end circuit had a-3,dB bandwidth of11.7,GHz with a transimpedance gain of97,dB while using a photodiode equivalent capacitance of300,fF.The equivalent input noise current was less than14.2,pA/Hz within the interesting band,and the size of core chip was720,μm×700,μm.

关 键 词：光接收机 跨阻放大器 改进型Cherry-Hooper 直流偏移消除电路 锗硅双极-互补金属-氧化物-半导体 

分 类 号：TN433[电子电信—微电子学与固体电子学]