PDN Capacitance Optimization Method Based on Lossless Resonator Power Ground Plane Modeling

Abstract

The invention discloses a PDN capacitor optimizing method based on lossless resonant cavity power supply horizon plane modeling. The method comprises the steps of 1) designing related parameters input in a power supply distribution network; 2) calculating an initial power supply distribution network impedance value according to the result of the step 1); 3) calculating number of decoupling capacitors according to the parameter designed in the step 1); 4) calculating an actual power supply distribution network impedance value Z according to the results of the steps 2) and 3); 5) determining a relation between a discrete frequency point f<n> and the maximum target frequency f<max>, if the f<n> is less than the f<max>, executing a step 6); and if the f<n>is equal to the f<max>, outputting the result of the step 3); and 6) comparing the Z with the target impendence Z<t> designed in the step 1), if Z is greater than Z<t>, returning to the step 3), and or otherwise, adding 1 to the subscript n of the discrete frequency point, and returning to step 4). By adoption of the PDN capacitor optimizing method, the target frequency band is expanded, and the number of the capacitors is reduced while the power supply distribution network design requirement is satisfied, so that the PDN capacitor optimizing method can be used for design and analysis of a high-speed system.

Description

technical field The invention belongs to the technical field of circuit design, and in particular relates to a capacitance optimization method of a power distribution network PDN, which can be used for the optimal design of a decoupling network in a power distribution network in a high-speed circuit. Background technique As the operating frequency of chips is getting higher and the switching speed of devices is getting faster and faster, the design of power distribution network PDN not only needs to provide pure power for the circuit, but also provide low-noise loops for high-speed signals, noise isolation between multiple chips and ensure The role of electromagnetic compatibility characteristics. The power distribution network mainly includes DC power supply, voltage control module VRM, also called DC-DC converter, printed circuit board PCB board-level decoupling capacitor, PCB board-level power / ground plane, connectors such as sockets, package-level power / ground Plane, pa...

AI Technical Summary

Problems solved by technology

The disadvantage of the latter two methods is that there are restrictions on the number and types of capacitors used in each order of magnitude, but not all of them can be satisfied in actual design, and the number of decoupling capacitors designed is not the minimum

The advantage of these distributed modeling methods is that the simulation accuracy in high-frequency systems is high, and the disadvantage is that the calculation amount is huge and the modeling process is more complicated.

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