5Gbps全差分双端光接收前置放大器设计.pdfVIP

第44卷第7期 红外与激光工程 2015年7月 Vol.44No.7 InfraredandLaserEngineering Jul.2015 5Gbps全差分双端光接收前置放大器设计 孙 洋袁黄启俊袁王 豪袁常 胜袁何 进 (武汉大学 物理科学与技术学院袁湖北 武汉 430072) 摘 要院光纤通信在大数据时代得到广泛的应用袁其速度快尧带宽大尧可靠性高的特点满足了对长距 离尧大容量信息传输的要求遥 前置放大器作为光接收器的前端袁其性能高低直接影响到整个光接收系 统的工作性能遥 基于SMIC 0.13 滋m CMOS工艺袁设计完成了一款5 Gbps光接收前置放大器遥 首先袁 整体差分式结构可以消除共模噪声的干扰袁降低放大器的等效输入噪声遥 其次袁采用共源共栅的输入 结构具有低输入阻抗的特点袁能有效抑制光电管大电容带来的不利影响遥 最后袁输出级采用电流模逻 辑结构袁解决了输出增益与带宽之间的矛盾遥仿真结果表明袁放大器增益达到62 dB赘袁带宽4.7 GHz曰 等效输入噪声30.1 pA/ Hz 袁眼图迹线清晰袁张开度较大袁能够满足5 Gbps平衡光探测器通信要求遥 姨 关键词院前置放大器曰 共源共栅结构曰 平衡探测器曰 光纤通信曰 电流模逻辑 中图分类号院TN929.1 文献标志码院A 文章编号院1007-2276(2015)07-2137-06 Design of5-Gbpsfull differentialoptical receiverpre-amplifier Sun Yang, Huang Qijun, Wang Hao, Chang Sheng, He Jin (School of Physics and Technology袁Wuhan University袁Wuhan 430072袁China) Abstract: Optical fiber communication has been adopted widely in big-data era, which can satisfy the long-distance and high-capacity needs with characteristics of fast speed, wide bandwidth and high reliability. As the front end of optical receiver, optical receiver pre-amplifier determines the performance of the whole receiver system. Based on SMIC 0.13 滋m CMOS technology, a 5Gbps optical receiver pre- amplifier was completed in this work. At first, the full differential structure can eliminate the common- mode noise and reduce the input-referred noise. Then, in order to suppress the defect of large photodiode capacitance, Regulated Cascade (RGC) structure with low input impedance was exploited. The output buffer was realized with Common-Mode Logic structure that can balance the gain and bandwidth. The simulation results show the gain of 62 dB赘 an