Barbed transmission lines for crosstalk suppression

As the increasing demand of small form factor and low-cost package drives the interconnect density, crosstalk noise due to the parasitic components set the limitation in off-die high speed signaling. This paper presents a barbed transmission line design to eliminate the far-end crosstalk by adding periodical stubs on the original microstrip structures. By purposely increasing the mutual capacitance, the signal discontinuity of microstrip line design is greatly improved for the multi-gigabit/second links in IC packages. The parametric analysis on stub tuning is given with geometric structures. The time-domain noise simulations and frequency domain crosstalk assessment are performed in accompany with the hardware experiments to verify the proposed concept.