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JSSC 2008第12期Clocking & PLLs0.18μmCDR

A 40-Gbs CDR Circuit With Adaptive Decision-Point Control Based on Eye-Opening M

提出一种40Gb/s时钟数据恢复电路,采用自适应决策点控制优化BER性能。
0.18-μm SiGe BiCMOS, 1.6W功耗, 189fs-rms抖动
时钟数据恢复眼图监测自适应控制高速数据链路误码率
创新点1:集成高精度眼图监测电路(EOM),通过实时监测眼图开口度,为自适应决策点控制提供精确反馈,显著提升40 Gb/s高速链路中的信号完整性分析能力。
创新点2:提出基于EOM反馈的自适应决策点控制(ADPC)方案,动态调整采样点以补偿传输损伤引起的时变波形失真,将BER从2e-7优化至1e-12,属系统级创新。
创新点3:采用0.18-μm SiGe BiCMOS工艺实现低功耗(1.6 W@433.3V)设计,同时达成189 fs-rms的超低抖动性能,体现电路级能效与精度平衡的创新。
创新点4:针对30%占空比失真的53-mV弱信号场景,通过ADPC方案实现鲁棒性CDR操作,验证了该方法在极端信道条件下的工程适用性。
Abstract
A 40-Gb/s clock and data recovery (CDR) circuit with an integrated high-precision eye-opening monitor (EOM) circuit and an adaptive control scheme for optimizing the data decision point are presented. An adaptive decision-point control (ADPC) scheme using the EOM feedback overcomes the time-varying waveform distortion due to transmission impairment, which causes severe degradation of bit-error-rate (BER) performance in high-speed ( 40 Gb/s) data link systems. A 2.5 2.0-mm proto- type chip is im