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Field Solver Selection in Allegro (BEM2D vs EMS2D)

Electro Node

Hi everyone,

From the Cadence documentation, it appears that the EMS2D field solver is recommended for designs operating above 2.5 GHz for various calculation in tool.

In my case, the design frequency is greater than 2.5 GHz, but I still observe that Allegro is using the BEM2D field solver.

I wanted to understand that from where in the tool can we select or switch between BEM2D and EMS2D?

I Would appreciate any guidance or insights on this.

Thanks,

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  • John T
    0 in reply to Electro Node

    Hi , just wanted to give you some official feedback on this. Please be aware that EMS2D functionality is exclusive to Allegro X PCB SI licenses only and cannot be accessed via OrCAD X PCB Editor standard licenses. It is selected using menu the menu Analyze > Preferences > Interconnect Models,then select the desired solver under the Trace Solver option. Some reference documentation: Working with Allegro PCB SI Field Solvers - EMS2D Settings.

    Bem2D vs EMS 2D :The Electromagnetic Solution 2D Full Wave field solver-EMS2D-in PCB SI and SigXplorer provides the full-frequency range analyis from DC, through the middle frequency range which covers the skin effect, to the THz range of the electromagnetic interactions which address resonances, radiations and EM signal integrity issues. EMS2D is implemented using the finite element method (FEM), which complements Allegro's moment-based BEM2D field solver. EMS2D combines multiple EM computation modules, static, quasi-TEM, and full-wave analysis. Additionally, EMS2D is able to analyze arbitrary transmission line-type and waveguide structures over PCB cross-sections and provide characterized models in RLGC and/or S-Parameter format

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