用于千兆以太网基带铜缆接收器均衡的甚高频自适应连续时间Gm-C二阶带通滤波器的研究和设计

Design of a Very High Frequency Adaptive Continuous Time Gm-C Second-order Band Pass Filter for Equalization in the Receiver of 1000BASE CS

本文设计了用于千兆以太网基带铜缆接收器均衡的甚高频自适应连续时间 Gm - C二阶带通滤波器。基于最陡梯度下降算法 ,带通滤波器的零点在 5 7～ 340 MHz的频率范围内可以自适应地调节 ,中心频率为 1.2 78GHz。通过外接电阻伺服环路 ,滤波器中跨导转换器的跨导值不受工艺偏差和温度变化的影响。采用 CSMC- HJ 0 .6μmCMOS工艺器件模型 ,用 Cadence Spectres仿真器仿真了设计的自适应滤波器电路 ,仿真结果验证了设计原理和设计的电路。系统的最长学习时间为

A very high frequency adaptive continuous time second order band pass filter for equalization in the receiver of 1000BASE CX is presented. Based on steepest decent algorithm, the zero point of the filler is adaptively adjusted in the range of 55～340 MHz, and the center frequency is 1.278 GHz. By using the externally connected resistor servo loop, the transconductance of the transconductors used in the filter is independent of process tolerances and temperature variations. Used the CSMC HJ 0.6 μm CMOS model, the adaptive second order band pass continuous time filter is simulated with Cadence Spectres simulator. The simulation results prove that the solution designing the adaptive second order band pass continuous time filter is correct. The longest study time is 880 reference clock periods.