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：

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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 _米 -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。