NOISE MITIGATION IN HIGH SPEED PCBS USING SPIRAL SHAPED POWER ISLAND EBG STRUCTURES

When a common power supply is used for both analog and digital circuits present in a mixed signal board operating at higher frequency, the noise generated from the high speed digital circuit propagates through the power delivery network (PDN) and affect the performance of sensitive analog circuits. In this paper, power integrity is studied for different EBG cell structures in between 0-10GHz using ADS software. From the simulated results, the straight line EBG provides good suppression for higher frequency, So a Modified Straight Line EBG is designed and examined. By using this in cascaded form the suppression level is maximum of about -65 at 19GHz and minimumof-30dB throughout 8-20GHz. using this in longbride the suppression is maximum of about -65dB at 14GHz and minimum of about - 30dB throughout 8-20GHz. By using this EBG in long bridge with via the suppression is maximum of about -72dB at 14GHz and minimum of -30dB throughout 8-20GHz.Finally the long bridge EBG with via is fabricated, measured and the experimental results have good agreement with the simulated results.