Research Of EBG For Power Supply Noise Suppression In High-speed PCB Circuit

With the rapid development of integrated circuit technology and the clock frequency continuously increasing in the high-speed digital circuits in the recent years, the signal integrity has become a significant issue in the PC B circuit design. Signal integrity mainly does some researchs on the impact of physical interconnection on signals and power. Importantly, the noise in signal transmission can be partially and even totally solved through the analysis of signal integrity. So it has been necessary for the engineers who dealing with the high-speed digital circuit design to master the knowledge of signal integrity. In addition, the simultaneous switch noise(SSN) which also named as ground bounce noise(GBN) on the power distribution network(PDN) has grown as a sharp concern.The basic theory of signal integrity is first introduced in this paper, including the theory of transmission lines, signal reflection, crosstalk and the definition of S parameter. Besides, some effective actions are given to reduce or depress reflection and crosstalk, respectivelly. Then the basic components of PDN are introduced, including voltage regulator modules(VRMs), a number of decoupling capacitors, power/ground and on-chip PDN. At the same time, the SSN are researched in the aspect formation mechanism and some traditional reduction method are given. After that, a better way to suppress SSN is recommended. With the obvious advantages of the electromagnetic bandgap(EBG) structure at suppressing SSN, it has made a deep impression on the researchers all over the world. Due to the EBG structure has developed rapidly and many researchers have proposed a variety of EBG structure used to suppress SSN. Then the paper analyzes the mushroom- like EBG structures and the coplanar EBG structures, including their peculiarities of the design concept, the characters of the stopband and the equivalent circuits. Meanwhile, a novel structure for SSN is proposed based on coplanar EBG power plane. The proposed EBG structure is designed on the basis of traditional periodic L-bridge EBG structure which is inserted by a small L-bridge cell with windmill- shaped slits. The similarity of simulation by use of Ansoft HFSS 2015 and measurement results made by vector network analyzer(VNA) compared by FSV shows that the presented structure possesses a wide stop band ranging from 510 MHz to 10.35 GHz at-40 dB suppression of the bandgap depth. Compared with the traditional L- EBG structure whose bandgap just covers from 500 MHz to 4.6 GHz, the bandwidth of the new structure is increased by 5.75 GHz. Then, the lower frequency is calculated by use of the lumped-component circuit model and the upper cutoff frequency is estimated by parallel plate waveguide model. In addition, the IR-drop and the dc resistance are accurately investigated by the simulation software of CST EM Studio. Finally, time-domain simulation results show that the structure in high-speed circuit is met with signal integrity.