Dual Resonant DGS based Common-Mode Filter for High-Speed Digital Circuit Applications

Abstract

This paper proposes a miniature, dual resonant filter to suppress the common-mode noise for high-speed digital circuit applications. This is a DGS(Defected Ground Structure) based filter. The uniqueness of this paper is that the single unit-cell DGS produces dual resonance. Both the two resonance are nearer to each other to provide wide stop bandwidth for common-mode noise. From the simulated results it is evident that the proposed filter allows the differential signal and attenuates the common-mode noise over the frequency band of interest. The filter is compact and it can be fabricated by using a standard PCB fabrication process.