一种适用于高速传输系统的高增益模拟均衡器

A high-gain analog equalizer suitable for high-speed transmission systems

针对传统模拟均衡器带宽和增益无法同时满足的问题,采用电感峰化技术和负阻抗转换器来进行高频操作,通过使用有源电感器实现电感峰化技术进而拓展带宽,同时采用由交叉耦合晶体管构成的负阻抗转换器将电容转换成负电容抵消输出端电容,在保持直流增益的同时提高了峰值增益。基于SMIC 130 nm的工艺库对电路进行设计,仿真结果表明,均衡器工作在1.8 V电源电压下,可以对6.375 Gbps速率下高速传输系统中严重损耗信道进行良好的补偿,眼图的水平张开度达0.85 UI。

To address the problem that the bandwidth and gain of conventional analog equalizers cannot be satisfied simultaneously,inductive cresting technique and negative impedance converter are used for high frequency operation.The bandwidth is extended by using active inductors to achieve inductive cresting techniques,while a negative impedance converter consisting of cross-coupled transistors converts capacitance into negative capacitance to offset the output capacitance,increasing peak gain while maintaining DC gain.The circuit is designed based on the SMIC 130 nm process library.The simulation results show that the equalizer works under the power supply voltage of 1.8 V,which can well compensate the severely lost channel in the high-speed transmission system at the rate of 6.375 Gbps.The horizontal opening of the eye diagram reaches 0.85 UI.