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Precise prediction method for worst power supply noise of high-speed circuit system

A circuit system, power supply noise technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of difficult to balance prediction efficiency and accuracy, and achieve the effect of improving prediction accuracy and prediction efficiency.

Active Publication Date: 2017-06-23
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and propose an accurate prediction method for the worst power supply noise of a high-speed circuit system, which is used to solve the technical problem that the prediction efficiency and accuracy existing in the prior art are difficult to balance

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  • Precise prediction method for worst power supply noise of high-speed circuit system

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:

[0023] refer to figure 1 , the present invention comprises the steps:

[0024] Step 1. Perform frequency domain simulation on the power distribution network of the linear time-invariant high-speed circuit system, and obtain the frequency domain self-impedance curve of the output port of the power distribution network. The specific steps of the frequency domain simulation are as follows:

[0025] Step 1a, add an AC current source I(ω) with a constant current amplitude of 1A to the output port of the power distribution network, where ω is the angular frequency, in rad / s;

[0026] Step 1b, performing frequency domain simulation on the power distribution network of the high-speed circuit system to obtain the amplitude curve of the output port voltage V(ω) of the power distribution network;

[0027] Depend on And I(ω)=1A given in step 1a, Z(ω)=V(ω) can b...

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Abstract

The invention provides a precise prediction method for worst power supply noise of a high-speed circuit system. The method is used for solving the technical problem that in the prior art, it is difficult to obtain prediction efficiency and precision at the same time. The method comprises the implementation steps that frequency domain simulation is performed on a power supply distribution network to obtain a frequency domain self-impedance curve of a power supply distribution network output port; an anti-resonance frequency value corresponding to a maximum peak value in the frequency domain self-impedance curve of the power supply distribution network is determined, and the anti-resonance frequency value is utilized to modulate a cycle rectangular wave with the duty ratio of 50% to obtain an input code pattern causing the worst power supply noise; simulation is performed to obtain a rise current and a drop current of the power supply distribution network output port; a worst current of the power supply distribution network output port is predicted; time domain impedance of the power supply distribution network is calculated; and the worst power supply noise of the high-speed circuit system is calculated. Through the method, prediction precision is improved on the premise of guaranteeing prediction efficiency, and the method can be applied to analysis of signal integrity in the high-speed circuit system.

Description

technical field [0001] The invention belongs to the technical field of circuit and system design, and in particular relates to an accurate prediction method for the worst power supply noise of a high-speed circuit system, which can be applied to the analysis of signal integrity in the high-speed circuit system. Background technique [0002] With the development of integrated circuit manufacturing process, the reduction of on-chip feature size and the expansion of integration scale, the development trend of modern high-performance chips is to increase the clock frequency, reduce the supply voltage, and increase the current; due to the continuous improvement of process technology, packaging design However, it remains relatively unchanged, resulting in an increase in the switching speed of the chip gate, and the existing package shows its inductance more. As the chip current and package inductance continue to increase, the power supply noise of high-speed circuit systems also i...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/10
Inventor 初秀琴李桃路建民李玉山
Owner XIDIAN UNIV
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