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Low power analogue equaliser with adaptive digital tuning for fast ethernet
IET Circuits, Devices & Systems ( IF 1.0 ) Pub Date : 2020-08-25 , DOI: 10.1049/iet-cds.2019.0370
Simon Buhr 1 , Xin Xu 1 , Martin Kreißig 1 , Christian D. Matthus 1 , Frank Ellinger 1
Affiliation  

This work presents an analogue equaliser with digital tuning. It compensates the losses introduced by up to 120 m long category 5 unshielded twisted pair cables and baseline wander (BLW). The equaliser is designed for Fast Ethernet with a symbol rate of 125 MHz. A g m -C filter, based on three first-order high pass filters, is used to compensate the cable loss. To minimise power consumption, three operational transconductance amplifiers (OTAs) are merged into a novel multi-input OTA structure. Additionally, a robust digital control logic is presented to automatically adjust the parameters of the equaliser for different cable lengths. A fast settling time below 250 µs is demonstrated for different scenarios. The equaliser is fabricated as part of a Fast Ethernet PHY chip in a 180 nm CMOS technology of GLOBALFOUNDRIES. Measurement results demonstrate error-free data transmission (bit error rate below 10 −12 ) for cable lengths up to 120 m. The power consumption of the analogue equaliser ranges from 2.3 mW (short cable) to 6.5 mW (120 m cable). To the best of the authors’ knowledge, this is the lowest power consumption of an analogue equaliser for Fast Ethernet, supporting additional BLW and flat loss compensation reported to date.

中文翻译:

具有自适应数字调谐功能的低功耗模拟均衡器,用于快速以太网

这项工作提出了一种具有数字调谐功能的模拟均衡器。它可以补偿长达120 m的5类非屏蔽双绞线电缆和基线漂移(BLW)带来的损耗。均衡器设计用于符号速率为125 MHz的快速以太网。甲克 -C滤波器基于三个一阶高通滤波器,用于补偿电缆损耗。为了将功耗降至最低,将三个运算跨导放大器(OTA)合并为一种新颖的多输入OTA结构。此外,还提出了一种强大的数字控制逻辑,可以针对不同的电缆长度自动调整均衡器的参数。演示了针对不同场景的低于250 µs的快速建立时间。均衡器是GLOBALFOUNDRIES采用180 nm CMOS技术制成的快速以太网PHY芯片的一部分。测量结果表明数据传输无误(误码率低于10 -12 ),电缆长度最大为120 m。模拟均衡器的功耗范围从2.3 mW(短电缆)到6.5 mW(120 m电缆)。据作者所知,这是用于快速以太网的模拟均衡器的最低功耗,支持迄今为止报道的其他BLW和平坦损耗补偿。
更新日期:2020-08-28
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