Power Delivery Network Design And Noise Suppression Analysis For High-Speed Digital Circuits

With the trend of the electronic systems toward higher data rates, lower supplyvoltages and lower power, digital, analog and radio frequency circuits, etc. are requiredto be integrated into one circuit module to obtain smaller bulk and higher performance.Larger switching current produced by higher performance systems requires higherpower supply performance of the power delivery network and results in worse powersupply noise. Power delivery network is the foundation of the high speed digital circuitdesign, which determines the performance of the signal integrity, power integrity andelectromagnetic integrity. So the design and analysis of the power delivery network arethe research emphasis. Power delivery network provides charges to the digital circuitsand at the same time provides excellent transmission path to the noise, so the powerdelivery network not only needs to ensure the power supply performance but also needsto suppress the noise, which results in more complex power delivery network design.Based on extensive summarization of the relative research results, the structures andcomponent functions of the power delivery network are analyzed systematically and therelative noise modeling, suppression and characteristic analysis are investigated in thisdissertation, and some progress are made. The major contributions of this dissertationare summarized as follows:1. The components and functions of the power delivery network are explained indetail, and the design methods and performance impact factors for the power deliverynetwork are discussed in depth. The intrinsic relationships between power integrity,signal integrity and electromagnetic integrity are well demonstrated, and the concept ofpower integrity, signal integrity and electromagnetic integrity co-design is developed.Based on this, the effect of power/ground noise on jitter is studied, and it is found thatthere is a strong frequency relation between power/ground noise and jitter.2. Based on the transmission matrix, a modeling method of non-ideal transmissionline is proposed to solve the crosstalk coupling noise in high speed transmission lines,and the crosstalk coupling noise waveform could be obtained by the new methodaccurately. Based on this, the crosstalk coupling characteristics of non-idealtransmission line are investigated in depth and the corresponding design rules areintroduced to suppress the effect of the non-ideal factors on high speed signal and improve the transmission line performance.3. The odd and even mode characteristics of the differential signal are analyzedwith the equivalent coupling circuits of differential transmission lines. The effects of theimpedance discontinuity and the changed delay produced by fringe field coupling of thetransmission line on differential transmission lines are investigated emphatically. Thelayout rules are proposed to suppress the common noise and the impedancediscontinuity for better signal quality through experiments.4. The transient characteristics of the time domain impedance function andswitching current are introduced in simultaneous switching noise calculation andsuppression analysis by the rational function, and a modeling method and an estimationmethod for simultaneous switching noise are proposed. The periodic characteristics andsuppression methods of the simultaneous switching noise are investigated based on theperiodic characteristics of the time domain impedance function and switching current.This method overcomes the shortcoming of the traditional power delivery networkdesign methods which do not consider the transient characteristics.5. The methods for simultaneous switching noise suppression are investigated indetailed. The simultaneous switching noise suppression is an important task of powerintegrity analysis and design. Two kinds of structures are proposed to suppress thesimultaneous switching noise in the power delivery network. A novel spiral bridge isproposed to connect two sides of the slit of the power/ground island for widebandsimultaneous switching noise suppression and good signal integrity. The dielectric withhigh dielectric constant is used in cascaded electromagnetic bandgap structures tobroaden the frequency bandgap and improve the capability of low frequency noisesuppression.6. The signal integrity of the electromagnetic bandgap structure is investigated indepth. The whole power/ground planes are destroyed by the high impedance plane ofthe electromagnetic bandgap structure which results in worse signal quality. Theresearch fields mainly focus on the effect of the electromagnetic bandgap structure onthe transmission characteristics of the single transmission line and the crosstalkcoupling noise characteristics of the multi-transmission lines. Design rules are proposedfor the applications of electromagnetic bandgap structures in signal integrity field.