Research On EBG Structures For Power Supply Noise Suppression In High Speed PCB Circuit

With the development of modern sience and technology, high-speed Very Large Scale Integration(VLSI) digital ICs are developing toward fast edge rising rates, high clock rates, low power consumption and low voltage level. This makes the power supply noise between the power plane and ground plane become more serious.Therefore, how to restrict power supply noise is one difficult problem many researchers meet, suppressing power supply noise for the development of high-speed PCB circuits is of great significance.The research of using electromagnetic band-gap(EBG) structure to suppress power supplly nosie have been the concern of many researchers. EBG is a array structure periodically arranged by the dielectric metal or hybrid of them, in a certain range of frequency bandwidth, EBG can stop electromagnetic wave propagation. Its unique nature makes it have broad application prospects. In this dissertation based on the EBG structure design theory, two new EBG structures are designed,and verifing their frequency stop-band characteristic and power supply noise restriction by using electromagnetic simulation software.The main work and achievements of this dissertation are summarized as follows:(1) Studying on the composition of the power distribution network(PDN) and the function of every components. and analyzing the causes and harm of power supply noise, providing an important theoretical basis for the power supply noise restriction using EBG structure.(2) Based on studying the theory of EBG structure, two new type EBG structures are designed, serpentine line loaded EBG structure and spiral line loaded EBG structure respectively. First the characteristics of stop-band are simulated by software. The simulation results indicate: the serpentine line loaded EBG’s stop-band of-30 d B is from 493 MHz to 1176 MHz, the spiral line loaded EBG’s stop-band of-30 d B is 300 MHz to 600 MHz, compared to the traditional mushroom-like EBG structure with the same parameters, the lower cut-off frequency of the two new type EBG structure is decreased by 24% and 64% respectively- Having achieved the miniaturization of EBG structure. At the same time, in order to expand the stop-band bandwidth, a new type of cascaded EBG structure is designed based on the theory of multi-via EBG structural characteristics, which stop-band of-30 d B is from 0.5GHz-5GHz.(3) S parameters verifies the band-gap characteristics of EBG structure in frequency domain, but in the end, the power supply noise suppression must be returned to the time domain signal, Therefore, this dissertation uses the schematic and layout co-simulation tool of ADS, in the time domain, verifies the power supply noise suppression of the new type EBG structure, it also proves that the EBG structure has the potential to replace the high frequency decoupling capacitor.