Research on Settling Time of Decision Feedback Equalizer

Taking the setting time of decision feedback equalizer (DFE) as the point of penetration, this paper uses Simulink in MATLAB to structure a model to research on the influence of setting time of DFE. A half rate direct two tap structure is proposed, which has the advantages of simple structure and high working speed. The least mean square algorithm is optimized, which not only inherits the stability and convergence of the least mean square algorithm, but also achieves easily. The simulation results show that on the premise that the RC constant is 20*$10^{-12}$ second, when the settling time is 120ps~160ps, the eye image quality and balance effect are the best, “eye height” and “eye width” approach the ideal values of 1V and 95ps; When the settling time is 90ps~120ps, the eye image quality and balance effect are a little bad, “eye height” and “eye width” can reach 0.94V and 93.09ps at most; When the settling time is 60ps~90ps, the eye image quality and balance effect are the worst, and the maximum “eye height” and “eye width” are only 0.52V and 71.12ps. Obviously, with the increase of the settling time, the equalization effect of the DFE is strengthens, the “eye height” and “eye width” the of the output eye diagram are improved 88.46% and 33.58% separately.