Network Parameter Accuracy in Electromagnetic Simulation
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Solution Overview
Problem
Traditional methods for calculating S-parameters, especially in low frequency domains including direct current conditions, suffer from low accuracy, necessitating a system and method to improve the accuracy of network parameters over a wide frequency range.
Innovation Solution
A method that involves converting network parameters into intermediate parameters with first and second portions, replacing the first portion with a value indicative of a direct current condition for frequencies lower than a defined first frequency, and replacing it with a transitional value within a frequency sub-range, thereby generating updated network parameters with improved accuracy across the frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to calculate S-parameters, then the calculation process is simple, but the accuracy is low in low frequency domains including DC conditions
Solution Approach 1:
The frequency range is divided into multiple segments: low frequency domain (below first frequency), mid frequency domain (between first and second frequencies), and high frequency domain (above second frequency). Each segment uses an appropriate calculation method or parameter representation, with the low frequency segment using impedance parameters converted from DC conditions and the high frequency segment using scattering parameters, thereby improving overall accuracy while managing complexity through targeted application of different methods in different frequency regions.
Solution Approach 2:
The patent transforms the network parameters between different representations (S-parameters, Z-parameters, Y-parameters) depending on the frequency domain. Specifically, impedance parameters are used and calculated from DC conditions in the low frequency domain where S-parameters are inaccurate, and scattering parameters are used in the high frequency domain. This parameter transformation allows accurate representation of electrical properties across the entire frequency spectrum.
2Adaptability or versatility
If S-parameters are used for high frequency applications, then they are effective in RF and microwave ranges, but they suffer from low accuracy in low frequency domain including DC condition
Solution Approach 1:
The patent creates a unified network model that can accurately represent electrical properties across the entire frequency spectrum from DC to high frequencies. This is achieved by combining DC-based impedance parameter calculations for low frequency accuracy with S-parameter representations for high frequency applicability, making the model universally applicable to both low frequency and high frequency applications without sacrificing accuracy in either domain.
Solution Approach 2:
DC conditions and low frequency impedance parameters are calculated and stored in advance before high frequency S-parameter measurements or calculations are performed. These pre-calculated DC-based parameters serve as accurate reference points for the low frequency domain, allowing the model to maintain accuracy across the full frequency range when combining with high frequency data through parameter transformation and interpolation.
Data Source
AI summary
Method, system, and computer readable medium are disclosed for analyzing electrical properties of a circuit. The method may comprise: providing a network model including at least one network parameter, the network parameter being defined over a frequency range; converting the network parameter into an intermediate network parameter having first and second portions; identifying first and second frequencies defining a frequency sub-range; replacing the first portion of the intermediate network parameter with a DC value when a frequency associated with the intermediate network parameter is lower than the first frequency; replacing the first portion of the intermediate network parameter with a transitional value when the frequency associated with the intermediate network parameter is within the frequency sub-range; and converting the intermediate network parameter with the replaced first portion into an updated network parameter.