一款基于码型检测SS-LMS算法的自适应均衡接收器

A Receiver with Self-adaptive Equalizer Controlled by Pattern Detection Based SS-LMS Algorithm

本文提出了一种新型的基于码型检测SS-LMS算法的自适应均衡接收器,所采用的7抽头判决反馈均衡器(DFE)和连续时间线性均衡器(CTLE)组合设计,可以有效消除信道传输中码间干扰的短距离后标分量,以及长拖尾后标分量和前标分量;同时,改进设计的基于码型检测SS-LMS算法,使均衡器可以动态补偿多种信道损耗,具有更快速稳定的收敛特性.本文所设计实现的自适应均衡接收器,采用TSMC28nmCMOS工艺完成了芯片的设计和流片,流片的测试结果表明,在12.5Gb/s的传输速率下,接收器可以最大补偿-25dB的半波特率通道衰减,均衡器系数在接收2×105 UI数据内收敛,收敛后接收误码率(BER)可以低于10^-12.

This paper presents a novel self-adaptive equalizer controlled by pattern-detection-based sign-sign Least Mean Square(SS-LMS)algorithm.With a combinational use of a 7-tap Decision Feedback Equalizer(DFE)and a Continuous-Time Linear Equalizer(CTLE),the new self-adaptive equalizer can effectively eliminate the short length post-cursor inter-symbol interference(ISI),the long-tail post-cursor and pre-cursor ISI respectively.Meantime,a new pattern-detection-based SS-LMS algorithm is raised to dynamically adjust the equalizer s coefficients to self-adaptively compensate different channel loss,and at the same time,to significantly improve the stability and convergence of the whole equalizer.Finally,by use of this new self-adaptive equalizer,a high-speed serial receiver is designed and fabricated in TSMC 28 nm CMOS process.Test result shows that,with the half-baud channel loss up to 25 dB,the new high-speed receiver obtains its receiving rate of 12.5 Gb/s with the BER less than 10^-12.And all the coefficients of the equalizer can converge in 2×10^ 5 UI received data.