Power distribution network design method based on decoupling region of decoupling capacitor

Abstract

The invention discloses a power distribution network design method based on a decoupling region of a decoupling capacitor. The power distribution network design method comprises the steps of: firstly, based on a resonant cavity model, modeling a power ground plane with decoupling capacitors; based on the modeling method, calculating out transverse and longitudinal decoupling radii of the decoupling capacitors; according to a frequency point corresponding to the maximum amplitude of an impedance of an input output port, selecting the required decoupling capacitor, and according to the transverse and longitudinal decoupling radii of the decoupling capacitor, selecting an installation position of the decoupling capacitor; and finally, drawing an impedance curve of a power distribution network. According to the invention, the problem that in the power distribution network design, the installation position of the decoupling capacitor cannot be obtained is solved; a rapid, simple and convenient method is provided for selection and placement of the decoupling capacitor in the power distribution network, and reliable guidance is provided for power integrity design in the practical engineering.

Description

technical field [0001] The invention belongs to the field of electronic technology, and further relates to a design method of a power distribution network based on a decoupling capacitor decoupling area in the field of high-speed circuit power distribution technology. The invention can be applied to the design of a power distribution network, and provides a decoupling design scheme including capacitor types and installation positions. Background technique [0002] With the continuous improvement of clock frequency and integration of high-speed digital circuits, the power supply noise generated in the power distribution network seriously limits the improvement of circuit performance. The power ground plane plays a very important role in high frequency digital integrated circuits. In the past, the power ground plane was modeled using lumped components, but the power ground plane will resonate at high frequencies, showing distribution characteristics, and the lumped model cann...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the calculation efficiency gradually decreases with the increase of the number of decoupling capacitors

However, the disadvantage of this method is that the power ground plane in the power distribution network is equivalent to a lumped capacitor for decoupling design, and the installation position information of the decoupling capacitor cannot be obtained, ignoring the actual circuit design. The effect of parasitic inductance on the ground plane on the decoupling effect, which may lead to a failed decoupling design

The disadvantage of this method is that the voltage distribution of the power ground plane in the actual circuit is not a constant value, and this assumption seriously affects the reliability of the calculation results

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