面向112GbpsPAM4串行接收机的低误码协同自适应均衡器*赖明澈,吕方旭,张庚,许超龙(国防科技大学计算机学院,湖南长沙410073)摘要:高速串行接口是高性能计算机和数据中心芯片之间互连的核心关键IP。随着业界单通道速率由56Gbps向112Gbps发展,高速串行接口的误码率急剧增加,严重影响互连性能和系统稳定性。针对112GbpsPAM4接收机误码率高的难题,首次采取一种协同自适应均衡器构架,提出了面向3种均衡器的自适应协同均衡算法,能在高插入损耗条件下取得较低误码率;提出了基于判决反馈均衡器的盲自适应均衡算法,能缩短链路训练时间,减少硬件开销。采用12nmCMOS工艺完成了基于协同自适应均衡器的接收机设计。仿真结果表明,针对经过36.5dB信道的去加重112GbpsPAM4信号,采取协同自适应均衡器的接收机误码率小于1e-12,收敛周期约400ns,功耗增幅仅约2.3%。关键词:高速串行接口;自适应均衡算法;连续线性均衡器(CTLE);前向反馈均衡器(FFE);判决反馈均衡器(DFE)中图分类号:TP393文献标志码:Adoi:10.3969/j.issn.1007-130X.2023.06.001AlowBERcooperative-adaptive-equalizerfor112GbpsPAM4wirelinereceiversLAIMing-che,LÜFang-xu,ZHANGGeng,XUChao-long(CollegeofComputerScienceandTechnology,NationalUniversityofDefenseTechnology,Changsha410073,China)Abstract:Highspeedserialinterfaceisthekeyintellectualproperty(IP)fortheinter-chipintercon-nectionduringthehighperformancecomputersanddatacenters.Asthesingle-channelrateoftheserialinterfaceevolvesfrom56Gbpsto112Gbps,thehighspeedserialinterfacefacesasharpincreaseinthebiterrorrate(BER),whichseriouslyaffectstheinterconnectionperformanceandthesystemstability.Inordertosolvetheproblemofthehighbiterrorrateat112GbpsPAM4receiver,acooperativeadap-tiveequalizerisproposedinthispaper.Firstly,anadaptivecooperativeequalizationalgorithmforthreekindsofequalizersisproposedtoachievelowbiterrorundertheconditionoflargeinsertionlosses.Thentheblindadaptiveequalizationalgorithmbasedondecisionfeedbackequalizerisproposedtoshort-enthelinktrainingtimeandreducethehardwareoverhead.Thispapercompletesthecircuitimplemen-tationofthereceiverwiththecooperativeadaptiveequalizerunderthe12nmCMOStechnology.Thesimulationresultsshowthatthereceiverwiththeproposedco...
