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Modeling of Ground Plane with Capacitive Power Supply and Simulation Method of Capacitive Decoupling Radius

A technology of power supply ground plane and capacitor power supply, which is applied in the electronic field, can solve the problem that the resonator cannot model the ground plane of the load power supply, and achieve the effect of ensuring calculation accuracy and improving calculation efficiency

Active Publication Date: 2018-03-06
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a ground plane modeling method with a capacitor power supply and a method for simulating the capacitance decoupling radius. question

Method used

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  • Modeling of Ground Plane with Capacitive Power Supply and Simulation Method of Capacitive Decoupling Radius
  • Modeling of Ground Plane with Capacitive Power Supply and Simulation Method of Capacitive Decoupling Radius
  • Modeling of Ground Plane with Capacitive Power Supply and Simulation Method of Capacitive Decoupling Radius

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Embodiment 1

[0035] Embodiment 1: The present invention is a ground plane modeling method with capacitor power supply and a method for simulation of capacitor decoupling radius, see figure 1 , Including the following steps:

[0036] (1) Use port P for the position of the input / output port on the power ground plane 0 Mark, use port P for the position of decoupling capacitor on the power ground plane 1 , P 2 ,..., P α Mark, where α is the number of decoupling capacitors terminated on the ground plane of the power supply. Record the coordinates of the decoupling capacitors and input / output ports respectively, see Figure 2(a), image 3 , Figure 4 , Figure 13(a).

[0037] (2) The coordinates of the decoupling capacitor k=1,2,...,α, the coordinates of the input / output ports The length a, width b of the power ground plane and the distance d between the power plane and the ground plane are substituted into the resonant cavity formula to calculate the frequency domain response of each resonant mode of...

Embodiment 2

[0045] Embodiment 2: Ground plane modeling with capacitor power supply and capacitor decoupling radius simulation method, the same as in embodiment 1, see Figure 5 , The calculation of the effective decoupling radius of the decoupling capacitor in step (5) includes the following steps:

[0046] 5.1) Calculate the frequency domain impedance distribution after adding decoupling capacitors to the power ground plane by using the closed resonant cavity formula with a capacitor power ground plane;

[0047] 5.2) Set the target impedance according to the performance requirements of the actual circuit. Since the circuit structure in this example does not involve specific circuit design, set the target impedance to 1Ω;

[0048] 5.3) Scan the frequency domain impedance distribution of the entire power ground plane in the circuit board, and mark the area where the impedance amplitude is less than the target impedance as the effective decoupling area, see Figure 5 , The area where the impedance ...

Embodiment 3

[0050] Embodiment 3: The ground plane modeling and capacitance decoupling radius simulation method with capacitor is the same as in embodiment 1-2, in which step (2) calculates the power ground plane resonant mode on the basis of the power ground plane resonant cavity formula Frequency domain response and port coefficient of each port. Any two ports P on the power ground plane i And P j The formula of the resonant cavity between

[0051]

[0052] Among them, m is the number of plane horizontal transmission modes, n is the number of plane vertical transmission modes; port P i The port coefficient is

[0053] Port P j The port coefficient is

[0054] The mode capacitance is

[0055] The mode loss is

[0056] The mode inductance is

[0057] The mode resonance frequency is

[0058] Where with Is port P i And port P j coordinate of; with Is the port size, so The specific expression of the sinc function is sinc(x)=sin x / x; ε is the effective dielectric constant of the medium fille...

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Abstract

The ground plane modeling and capacitance decoupling radius simulation method disclosed by the present invention first records the coordinates of the input / output port and the decoupling capacitor port; calculates the port coefficient according to the resonant cavity formula or the resonant cavity formula based on the dual-frequency point approximation algorithm , The frequency domain response of each resonance mode; use the port coefficient, the frequency domain response of each resonance mode, the number of modes, the frequency domain response of the capacitor, and the number of capacitors to solve each capacitor division scheme; convert the divided capacitors to the power ground plane In the resonant cavity model, the resonant cavity formula of the power supply ground plane with capacitance is obtained; the actual frequency-domain impedance distribution of the power ground plane is calculated using the resonant cavity formula, and the decoupling radius of the capacitor is extracted on the basis of the impedance distribution. The invention solves the problem that the resonant cavity algorithm cannot model the ground plane of the power supply with capacitance, and provides a fast and simple method for modeling the ground plane of the power supply with load. The decoupling radius is the decoupling capacitance in the power integrity design Selection and placement provide reliable guidance.

Description

Technical field [0001] The invention belongs to the field of electronic technology, and relates to a ground plane resonant cavity model with a capacitor power supply and the modeling calculation of the effective decoupling radius of the capacitor, in particular to a ground plane modeling with a capacitor power supply and a simulation method of the capacitor decoupling radius for calculating the belt The frequency domain impedance and resonance mode of the capacitor power ground plane and the decoupling of the distributed power distribution network in the high-speed circuit board. Background technique [0002] When input / output connections are transmitted between chips, the interconnection and power distribution network interact to generate power noise. With the continuous improvement of digital circuit clock frequency and integration, the power supply noise generated in the power distribution network severely limits the improvement of circuit performance. The power ground plane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 路建民王君任学施李先锐初秀琴刘洋
Owner XIDIAN UNIV
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