一种基于频谱平衡的双环自适应CTLE

A Dual Loop Adaptive CTLE with Spectrum Balancing

设计了一种速率达10 Gbit/s的基于频谱平衡的自适应CTLE。采用电感并联峰化技术和源极退化技术来提高线性均衡器的带宽和增益。通过有源混合滤波器同时调整低频部分和高频部分的截止频率,拓展基于频谱平衡自适应CTLE的速率范围。同时,采用直流失调抵消环路(DCOC)来减少失配误差。基于TSMC 0.18μm CMOS工艺进行仿真。仿真结果表明,10 Gbit/s PRBS7信号经过Nyquist频率处损耗达15.451 dB的45.72 cm FR4背板传输,再经均衡器均衡后,眼图张开度达到0.5 UI。

A 10 Gbit/s adaptive CTLE based on spectrum balancing was designed.The bandwidth and gain of the linear equalizer were improved by inductor parallel peaking and source degradation techniques.In order to extend the rate range of adaptive CTLE based on spectrum balancing,the cut-off frequency of low frequency and high frequency was adjusted simultaneously by the active hybrid filter.Meanwhile,the mismatch error was reduced by DC offset cancellation loop(DCOC).The simulation was carried out by TSMC 0.18μm CMOS process.The results showed that the 10 Gbit/s PRBS7 signal was transmitted through an 45.72 cm FR4 backplane with a loss of 15.451 dB at the Nyquist frequency,and after equalization with equalizer,the eye opening reached 0.5 UI.