Reference Impedance Adaptation for Electromagnetic Simulation Accuracy
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Solution Overview
Problem
Existing electromagnetic simulation methods using a fixed 50Ω reference impedance are insensitive to variations in electrical properties of power/ground systems, leading to inaccurate S-parameters in network modeling.
Innovation Solution
Adaptive method to compute the input impedance of network ports and redefine the reference impedance based on this input impedance, allowing for the recalculation of network parameters to enhance sensitivity to electrical property variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed 50Ω reference impedance is used in electromagnetic simulation, then the simulation process is simple and standardized, but the S-parameters become insensitive to variations in electrical properties of power/ground systems
Solution Approach 1:
The patent implements dynamic reference impedance adaptation by computing input impedance at each port and using it to determine an adapted reference impedance value. This transforms the static 50Ω reference impedance into a dynamic parameter that adapts to the actual electrical characteristics of the circuit under test, thereby improving sensitivity to electrical property variations while maintaining computational tractability through automated algorithms
Solution Approach 2:
The patent changes the reference impedance parameter from a fixed 50Ω value to an adapted value derived from computed input impedance. This parameter transformation is achieved through mathematical relationships involving S-parameters and input impedance calculations, allowing the simulation to better match actual circuit conditions without requiring complete redesign of the simulation framework
2Measurement precision
If the reference impedance is adapted based on input impedance, then the accuracy of electromagnetic simulation is improved, but additional computation steps are required
Solution Approach 1:
The patent performs preliminary computation of input impedance at each port before finalizing the S-parameter results. By calculating input impedance first and using it to determine the adapted reference impedance in advance, the method enables more accurate S-parameter extraction without requiring iterative adjustments during the main simulation process, thus reducing overall computational overhead
Solution Approach 2:
The patent implements a feedback mechanism where computed input impedance values are used to adjust the reference impedance parameter, which in turn affects the S-parameter calculations. This closed-loop approach ensures that the simulation adapts to actual circuit conditions while maintaining computational efficiency through direct mathematical relationships rather than iterative optimization
Data Source
AI summary
Methods, systems, and computer-readable media for reference impedance adaptation are disclosed. The method may comprise a step of providing a network model of a circuit having at least one port, wherein the network model includes at least one network parameter, the network parameter being associated with the port and being defined based on a reference impedance of the port. The method may further comprise computing an input impedance of the port based on the network parameter. The method may also include defining a new reference impedance for the port based on the input impedance. Moreover, the method may include calculating a new network parameter of the network model based on the new reference impedance.