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Ultra-Wideband SSN Mitigation by Splitting PWR Plane in Triangle Patches and Hexagonal Arrays
Keywords: SSN, Signal Integrity, PWR plane splitting
Parallel plate waveguide (PPW) noise, also known as simultaneous switching noise (SSN) or ground bounce noise (GBN) is one of the major concerns for high-speed digital computer systems with fast edge rates, high clock frequencies, and low voltage levels. The resonance modes between the PWR/GND planes excited by the GBN causes significant signal integrity problems as well as electromagnetic interference (EMI) issues for the high-speed circuits. Adding decoupling capacitors is a typical way to suppress SSN, however, in general, these capacitors are not effective at frequencies higher than the MHz range due to their finite lead inductance. In the present paper a novel PWR plane designed with triangle patches and hexagonal array will be proposed which provide wide band noise suppression. The novelty of the proposed design is not only the wideband range of noise mitigation, but also the low frequency suppression, which is well know to be a difficult task for EBG structures. The proposed structure is based on the two-layer concept with designing a periodic coplanar splitting pattern on the PWR plane and still keeping continuous for the GND plane. Although the proposed PWR plane demonstrates wideband suppression of the SSN with a cost effective design, the degradation of the perforated power plane to the signal quality is needed to be evaluated, since it could affect the signal quality. For this reason, in the final paper a single-end signal layer will be modeled in the equivalent electromagnetic model and eye diagrams as well as Time Domain Reflectometry (TDR) will be used to evaluate the signal integrity of the modified structure (with splitting plane) in comparison with the case of continuous PWR plane.
Antonio Ciccomancini Scogna,
CST of America, Inc.
Wellesley Hills, MA

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