Research On Noise Suppression And Isolation In Power Distribution Network Of The High-speed Electronic System

In recent years, advances in CMOS technology resulted in electronic system with higher switching speeds, lower power supply voltages, higher package densities and higher power consumption. As the systems operate toward higher frequency range, the distributed and parasitic effects of the power distribution network(PDN) become dominant. The PDN noise above gigahertz will be expected to be serious, the power integrity(PI) design will be more challenging due to the wider frequency bandwidth of the noise energy on the PDN with a smaller noise margin in the DC power level, and the decreased immunity of modern devices to noise, electromagnetic interference(EMI),and voltage fluctuations on the PDN. Suppression and isolation of the PDN noise is one of the main efforts for PI design in high-speed or mixed-signal circuits.This dissertation first introduces the constitution of the PDN in the high-speed electronic system and then the functions of each part of the PDN. On this basis, we discussed the fundamental mechanisms behind the generation of the simultaneous switching noise(SSN) at low and middle-frequency due to the parasitic inductance connected to the power or gnd nodes of the PDN, and the PDN noise induced by planes resonance and the return path discontinuity(RPD) at higher frequency.In this dissertation, we made a relatively detailed analysis of the design methodology of the decoupling capacitor network which can effectively suppress the PDN noise at low and middle frequency. And followed by is the emphasis of this dissertation, a novel type of small size and low period enhanced AI-EBG is proposed,which can be used to suppress the PDN noise form 400 MHz to 9.5 GHz under-40 d B level, overcomes the limitations of traditional EBG structures, such as limited bandwidth and rather higher onset frequency.Combined the design method of the decoupling capacitor network with the proposed novel enhanced AI-EBG structure, we can fully cover the low and middle frequency and high frequency range, achieve effective and distinctive suppression and isolation of the PDN noise.Another focus of this dissertation is the study of possible problems arise from the application of EBG in high speed circuit for PDN noise suppression, such as the signal integrity issues and the function failure of severely degradation of the noise suppression performance of the EBG structure. In practical high speed circuit design and application,when signal traces are referenced to these perforated EBG power planes, there will be degradation in the signal quality. The impact of the proposed EBG power planes on the SI for the signal traces referring to the EBG power plane can be greatly improved by implementing differential signaling and modified embedded EBG design. This paper also analyzes the mechanism of function failure of PDN noise suppression when the EBG power plane is sandwiched between continues ground planes pairs. With proper design, we can retrieve the excellent PDN noise suppression performance, and at the same time, keep good signal integrity.