CAJ | 학술논문

光纤通信在大数据时代得到广泛的应用，其速度快、带宽大、可靠性高的特点满足了对长距离、大容量信息传输的要求。前置放大器作为光接收器的前端，其性能高低直接影响到整个光接收系统的工作性能。基于SMIC 0.13μm CMOS工艺，设计完成了一款5 Gbps光接收前置放大器。首先，整体差分式结构可以消除共模噪声的干扰，降低放大器的等效输入噪声。其次，采用共源共栅的输入结构具有低输入阻抗的特点，能有效抑制光电管大电容带来的不利影响。最后，输出级采用电流模逻辑结构，解决了输出增益与带宽之间的矛盾。仿真结果表明，放大器增益达到62 dBΩ，带宽4.7 GHz；等效输入噪声30.1 pA/姨Hz ，眼图迹线清晰，张开度较大，能够满足5 Gbps平衡光探测器通信要求。
광섬통신재대수거시대득도엄범적응용，기속도쾌、대관대、가고성고적특점만족료대장거리、대용량신식전수적요구。전치방대기작위광접수기적전단，기성능고저직접영향도정개광접수계통적공작성능。기우SMIC 0.13μm CMOS공예，설계완성료일관5 Gbps광접수전치방대기。수선，정체차분식결구가이소제공모조성적간우，강저방대기적등효수입조성。기차，채용공원공책적수입결구구유저수입조항적특점，능유효억제광전관대전용대래적불리영향。최후，수출급채용전류모라집결구，해결료수출증익여대관지간적모순。방진결과표명，방대기증익체도62 dBΩ，대관4.7 GHz；등효수입조성30.1 pA/이Hz ，안도적선청석，장개도교대，능구만족5 Gbps평형광탐측기통신요구。
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 μm 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 dBΩ and bandwidth of 4.7 GHz. Meanwhile, the amplifier has a input-referred noise of 30.1 pA/√Hz . The eye diagram is clear and the opening is enough big, which can meet the communication demand of 5 Gbps balance detector system.