Wideband Suppression of SSN Using Spiral-shaped Localized Defected Structures

A simple topology is proposed for mitigating simultaneous switching noise (SSN) in high-speed circuit system, by employing spiral-shaped localized defected structures (LDS) on ground (or power) plane. An accurate equivalent circuit model of proposed structure is presented to analyze its low frequency performance of SSN suppression, which is proved to match the simulated and measured results well. Experimentally, with an extremely small lower cutoff frequency of 145 MHz, a wideband suppression of SSN up to 5.66 GHz is achieved under the criterion of -40 dB. Furthermore, signal integration is discussed and it is found that the proposed structure can minimize the influence of SI.