High-Performance Adaptive Decision Feedback Equalizer Designs for Ethernet Systems
Date Issued
2004
Date
2004
Author(s)
Chen, Nancy Fang-Yih
DOI
en-US
Abstract
As the applications and prevalence of the world wide web (WWW) flourish over the past decade, the demand for higher bandwidth and data rate is skyrocketing. In August 2002, the IEEE 802.3ae task force finalized the 10-Gigabit Base LX4 Ethernet Standard. However, under multi-gigabit data rates, fiber is no longer an ideal transmission medium. This is especially the case for multi-mode fiber (MMF) used in 10G Base LX4 Ethernet systems, because it suffers from differential mode dispersion (DMD). However, conventional adaptive decision feedback equalizers (ADFE) cannot attain the bit error rate (BER) requirement of 10-12 in 10G Base LX4 Ethernet systems, because hard decision of slicers causes error propagation in the feedback loop. Soft threshold multi-layer adaptive decision feedback equalizer (STM-ADFE) designs are adopted to solve this problem. Our system simulation environment includes three representative channel impulses responses, trans-impedance amplifier (TIA), analog equalizer (AEQ), analog/digital converter (ADC), and STM-ADFE. Integration with the analog front end reduces the filter tap numbers needed in STM-ADFE. VLSI architectures of STM-ADFE are also presented. With low hardware overhead, STM-ADFE not only lowers the BER, but also reduces the bit resolution needed in the ADC from 8 to 6.
Subjects
位元錯誤率
回饋等化器
謬誤延遲
Bit Error Rate
Decision Feedback Equalizer
Error Propagation
Type
thesis
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