Electromagnetic Modeling for Electronic Circuit Design

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Solution Overview

Problem

Current methods struggle to accurately simulate complex PCB designs due to the difficulty in capturing parasitic effects and high-frequency interactions across multiple design fabrics, such as IC, package, and PCB designs.

Innovation Solution

A computer-implemented method that involves receiving an electronic design layout, performing parasitic extraction, extracting an electromagnetic model, reconnecting coupling capacitors, and performing simulations to improve the accuracy of high-frequency effects modeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electromagnetic solver is used for RF critical parts, then measurement precision is improved, but productivity deteriorates

Engineering Contradiction:

Improveaccuracy of high frequency effects modelingVSAvoidextraction and simulation run time

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The design layout is divided into RF critical parts (extracted using electromagnetic solver) and non-RF critical parts (extracted using parasitic extraction tools). This segmentation allows the electromagnetic solver to be applied only where necessary for high frequency accuracy, while the majority of the design uses faster parasitic extraction methods.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different extraction methods are applied to different regions of the design based on their RF criticality. RF critical parts receive the high-precision electromagnetic solver treatment, while non-RF critical parts use the faster parasitic extraction approach, optimizing the balance between accuracy and runtime locally.

Inventive Principle:

Principle #3Local quality

2Productivity

If parasitic extraction tools are used for non-RF critical parts, then productivity is improved, but measurement precision deteriorates

Engineering Contradiction:

Improveextraction and simulation run timeVSAvoidaccuracy of parasitic effects modeling

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

Coupling capacitors serve as intermediaries that connect the EM model (s-parameter model) with the RC netlist model. These capacitors represent the capacitive coupling between RF critical and non-RF critical parts, allowing accurate high frequency effects to be captured at the interfaces while using faster extraction methods for the bulk of the design.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If electromagnetic model is extracted, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improveaccuracy of electromagnetic modelingVSAvoidcomplexity of reconnecting coupling capacitors

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Coupling capacitors act as intermediary elements that simplify the integration between EM models and RC netlists. By representing capacitive coupling at the interfaces with these capacitor elements, the complexity of directly integrating two different modeling approaches is reduced to a manageable circuit element connection problem.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12314654B1System and method for electromagnetic modeling in an electronic circuit design

Publication Date: 2025.05.27 CADENCE DESIGN SYST INC

AI summary

Embodiments include herein are directed towards a method for use in an electronic design environment is provided. Embodiments may include receiving, using at least one processor, an electronic design layout and performing parasitic extraction on the electronic design layout. Embodiments may further include extracting an electromagnetic model from the electronic design layout and reconnecting at least one coupling capacitor associated with a net of the electromagnetic model. Embodiments may include performing a simulation including the reconnected at least one coupling capacitor.