Far-End Crosstalk Mitigation for Microstrip Lines in High-Speed PCBs

With improvement in the speed and frequency of electronic circuits, far-end crosstalk (FEXT) problem in printed-circuit board (PCB) neighboring routes becomes one of most critical factors affecting signal quality. In this paper, the FEXT can be mitigated significantly by inserting rectangular-shape resonators (RSR) structures in the coupled microstrip transmission lines where defected microstrip structures (DMS) are etched on the lines. The frequency domain simulation of HFSS shows that the S41 of this proposed structure is decreased more than 16dB around 3.2GHz, compared with the traditional signal routing. The time domain simulation of ADS shows that the peak of FEXT voltage of this structure is improved to 89% compared to the traditional signal routing. It has been successfully demonstrated by simulation and comparison with all previous techniques that, this novel technique gives the best optimum low values for the peak voltage of FEXT. Thus, there is a great potential in DDR5, where the requirement of the high density wiring design is even severe.