Spiral bridge for wideband simultaneous switching noise suppression and good signal integrity in partitioned planes

A novel spiral bridge is proposed to connect two sides of the slit of the power/ground island for wideband simultaneous switching noise (SSN) suppression in partitioned power/ground planes. The -30dB SSN suppression stopband is from 1.4 to 6.1GHz and the -35dB SSN suppression stopband is from 2.4 to 5.4GHz, 96% enhancement of -30dB stopband bandwidth and 275% enhancement of -35dB stopband bandwidth are realized respectively, which is verified with the simulated and measured results. The effects of the length and gap of the spiral bridge on the SSN suppression are also studied, and the low frequency noise could be suppressed by long length and large gap. The effect of the spiral bridge structure on the signal integrity (SI) is also investigated. It is shown that good SI can be maintained due to the continuous return path provided by the spiral bridge structure.