https://community.cadence.com/cadence_technology_forums/system-analysis/en-USTelligent Community 13https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/74733/why-does-ddr5-technology-require-ibis-ami-models-whereas-traditional-ibis-or-spice-only-simulations-were-often-sufficient-for-earlier-ddr-generations/1434967Thu, 22 Oct 2026 10:48:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:1e943185-9487-4253-9d86-9d576e552332StephenNewberryB :)https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/74733/why-does-ddr5-technology-require-ibis-ami-models-whereas-traditional-ibis-or-spice-only-simulations-were-often-sufficient-for-earlier-ddr-generationsThu, 22 Oct 2026 05:22:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:5457423a-0d20-4372-94c1-ee5c7086a2bcSumithOptions: A. DDR5 operates at lower voltages and therefore requires larger S-parameter files. B. DDR5 introduces receiver and transmitter equalization techniques such as DFE, CTLE, and FFE , which cannot be accurately represented using traditional IBIS models alone. C. DDR5 replaces all channel simulations with transistor-level SPICE simulations. D. DDR5 eliminates the need for signal integrity analysis by using on-die termination.Topology Explorerhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/74731/how-to-import-a-brd-file-into-clarity-3d-layout-with-only-selected-nets/1434961Wed, 21 Oct 2026 13:59:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:18c680ea-af11-4aae-b47e-5a4dfcee77a4SumithIn the translator settings, you can enable the "Show Net Selection Dialog" option. This opens the net selection window, where you can choose the nets to import. Another option is to disable all nets and then select only the relevant ones in the Net Manager . This approach is useful when importing all nets.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/74731/how-to-import-a-brd-file-into-clarity-3d-layout-with-only-selected-netsWed, 21 Oct 2026 13:15:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:63665ba2-853b-4164-91a9-95b08bb460cecistheta07Hi everyone, I am working with a large PCB design in Clarity 3D Layout and need to perform electromagnetic simulation on only a few selected signal and reference nets. When importing the complete .brd file, the design contains many nets that are not relevant to my analysis. Importing the entire design may increase memory usage and simulation time. Is there a way to select only the required nets during board-file import, without importing all the available nets ? If so, could someone share the recommended procedure and any important considerations when selecting signal, power, and ground nets? Thank you in advance for your help!Clarity3DSigrityhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/74709/ai-powered-innovation-meets-next-generation-si-pi-analysis-cadence-sigrity-clarity-2026-1Thu, 15 Oct 2026 05:49:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:96f8d978-2d56-41f3-bd36-8e183e9061deRenu VibhaIntroducing Cadence® Sigrity ™ & Clarity ™ 2026.1 We are pleased to announce the availability of Cadence® Sigrity ™ & Clarity ™ 2026.1 , delivering new capabilities and workflow enhancements for signal integrity (SI), power integrity (PI), advanced packaging, thermal analysis, and 3D electromagnetic simulation. The 2026.1 release introduces innovations designed to help engineering teams address the growing complexity of AI infrastructure, high-performance computing, networking, advanced packaging, and next-generation electronic systems. Release Highlights AI Antenna Designer in Clarity ™ 3D Layout for antenna topology generation and optimization. Clarity ™ 3D Power Integrity (Clarity PI) for broadband power integrity analysis of ICs, interposers, and advanced package designs. GPU acceleration support in Clarity and Celsius ™ workflows on supported Linux platforms supported GPUs. This includes support for deployments on the Cadence Millennium AI Supercomputer powered by the NVIDIA Blackwell Platform. Monte Carlo and Fast Monte Carlo analysis for statistical design exploration and variability assessment. Enhanced support for rigid-flex design workflows . New ECAD-MCAD co-design capabilities for full-system 3D EM simulation workflows. Productivity enhancements across Sigrity ™ , Clarity ™ , PowerSI®, PowerDC ™ , OptimizePI ™ workflows. The release is now available for download from Cadence Downloads . Download the release from Cadence Downloads . To learn more, explore the latest documentation, videos, tutorials, and training resources available through Cadence Learning and Support We look forward to hearing about your experience with Sigrity & Clarity 2026.1.https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/70336/how-to-enforce-causality-and-passivity-automatically-in-clarity-3d-workbenchThu, 24 Sep 2026 05:21:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:6a24aec3-dbb7-45c6-bcb4-00de0d25ee42ALLpdfCausality enforcement - To enforce causality, go to Simulation> Options . It will open the Simulation Options window. Go to Electric Models and enable the Enforce causality in material parameters check box. Then, click OK . The causality will now be enforced to the generated S-Parameter. Passivity enforcement - Go to Simulation > Options . The Simulation Options window will open. Go to Basic Options and enable the Automatically check and export passive result check box. It will enforce passivity automatically to the generated S-Parameter.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409337Wed, 16 Sep 2026 16:01:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:8e55c20f-a25d-4a6a-b5fa-a45e040547b0SumithThank you everyone for the great questions and engagement today. Feel free to post your questions and we will address them accordingly.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409336Wed, 16 Sep 2026 15:52:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:4e87d2d6-39f6-494a-8666-e9cca538593eSumithYes, this is actually a common situation in high-frequency EM simulations. Consider a differential via structure that initially appears to perform very well up to 50 GHz. The S-parameters are smooth, insertion loss looks realistic, and there are no obvious signs of a problem. Based on the initial results, one might conclude that the design is acceptable. However, after performing mesh refinement, a previously hidden resonance may shift by several GHz, leading to a different engineering conclusion. In this case, the critical electromagnetic behavior was concentrated around the via anti-pad region, where strong fringing fields existed. The original mesh was too coarse in key areas such as: 1. Via barrels 2. Anti-pad edges 3. Plane transitions As a result, the solver technically converged and produced a numerically stable solution, but the local field behavior was not sufficiently resolved. The simulation looked accurate because the S-parameters were smooth and physically reasonable, yet the solution had not fully converged with respect to the mesh. This example highlights an important point: a simulation can appear correct and even meet convergence criteria, while still missing important physical effects due to insufficient local mesh resolution. Therefore, confidence in a result requires both: 1. Numerical convergence of the solver, and 2. Physically accurate modeling and sufficient mesh resolution in regions where electromagnetic fields are concentrated.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409335Wed, 16 Sep 2026 15:44:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:8a1c1d85-7584-4ac6-bcd6-547f4dcee646CF202606104231Any example that you can share , practical one where convergence criteria failed and mat be simulation appeared accuratelyhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409334Wed, 16 Sep 2026 15:32:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:67515eab-770b-4300-87c7-bd8e8288abafSumith1. Never trust the first run. Always perform at least one mesh refinement study. 2. Check current flow and return paths, not just S-parameters. 3. Use realistic material and roughness data. 4. Simulate beyond the target frequency (e.g., 110 GHz for a 50 GHz design). 5. Ask "Why do I see this behavior?" for every resonance, notch, or loss peak. If you cannot explain it, investigate further before signing off the design.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409333Wed, 16 Sep 2026 15:27:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:94615465-02fc-4f0f-8f94-79ef8d77faa9CF202606104231For someone new to simulation , any best practices that you can share? For results at 50Gbzhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409332Wed, 16 Sep 2026 15:17:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:9fc69058-d168-4729-9b6f-206e9617aff7SumithFor getting started, great question. I assume you are using a 3D FEM based solver for simulation. At 50 GHz and beyond , the most reliable indicator of accuracy is result convergence , not visual appearance. If the results remain essentially unchanged after mesh refinement, material verification, and frequency sweep refinement, the simulation is much more likely to represent the true physical behavior of the structure.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409331Wed, 16 Sep 2026 15:12:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:4bc3915b-7d61-4b05-ab55-80ca1f48cc25CF202606104231If my simulation result looks okay, how do I know they accurately reflect behaviour at 50 GHz and beyond?https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409330Wed, 16 Sep 2026 15:05:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:dd88ab29-cb1b-4970-afe5-a9a3f244f2d4SumithWelcome everyone and thank you for joining today’s Expert Session. Please feel free to post your questions any time—we’re here to help.https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/66324/how-to-include-exact-0-hz-dc-point-in-powersi-to-avoid-low-frequency-extrapolation/1409321Tue, 15 Sep 2026 12:20:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:91ba4533-631e-42dd-9d91-c25b90b6e6fdAK20250609765Additionally, don't miss our next learning session, designed to bridge cutting-edge theory with real-world implementation. Moderated by a Cadence engineer, the discussion will provide practical guidance, proven techniques, and opportunities to engage directly with experts. Topic: Trusting Simulation Clarity at 50 GHz and Beyond Date: Wednesday, September 16, 2026 Time: 8:30 PM - 9:30 PM IST We would be delighted to have you join us.https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/66324/how-to-include-exact-0-hz-dc-point-in-powersi-to-avoid-low-frequency-extrapolation/1409320Tue, 15 Sep 2026 12:17:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:374f21fd-aba8-4d1e-ad68-8d13a0026b49AK20250609765Hi Cistheta, Thank you for your question. When accurate DC-to-high-frequency behavior is required, relying on low-frequency AC extrapolation down to 0 Hz may not provide an accurate DC reference. PowerSI provides a DC–AC fitting feature that uses PowerDC to calculate the static DC solution and incorporates it into the S-parameter model. To obtain an accurate static 0 Hz reference in PowerSI, enable the Calculate DC point as reference option under: Tools → Options → Edit Options → Simulation (Advanced) → Field Domain → PowerDC Option Alternative: Merge Existing DC and AC Models If you already possess a standalone DC model (from PowerDC or measurements) and a separate high-frequency AC S-parameter model (e.g., starting at ), you do not need to re-run the full EM extraction. PowerSI provides the Merge DC+Normal data feature, which allows the DC and AC datasets to be combined into a single S-parameter model. Please let me know if you have any further questions. Best regards, Alokhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409317Mon, 14 Sep 2026 08:29:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:2a55bc0f-1e2b-4d4d-9f1a-d184ceaacf11Renu Vibha2 days to go! Feel free to submit your questions now or join us LIVE on Wednesday September 16th.https://community.cadence.com/cadence_technology_forums/system-analysis/f/clarity-3d-solver/66297/join-us-on-wednesday-sep-16th-2026-for-our-next-live-ask-me-anything-session-on-trusting-simulation-clarity-at-50-ghz-and-beyond-and-discover-how-to-achieve-accurate-reliable-results-for-next-generation-high-speed-designs/1409296Thu, 10 Sep 2026 09:36:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:58939b5d-d1fc-4412-8a9b-8dfccdedc901Renu VibhaThank you for your active participation in our past sessions. We hope the discussions were helpful and that we were able to provide timely responses to your questions. As part of our continued commitment to supporting you, our next session is scheduled for September 16 , and we would be delighted to have you join us at 8:30 PM - 9:30 PM IST Topic: Trusting Simulation Clarity at 50 GHz and Beyond .https://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/66325/what-has-been-your-most-challenging-signal-integrity-issue-in-a-recent-design-and-which-sigrity-features-or-workflows-proved-most-valuable-in-diagnosing-and-solving-itThu, 10 Sep 2026 07:18:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:202de8f3-201e-4cb0-b7f7-d47f079c8368Sumithhttps://community.cadence.com/cadence_technology_forums/system-analysis/f/sigrity/66324/how-to-include-exact-0-hz-dc-point-in-powersi-to-avoid-low-frequency-extrapolationThu, 10 Sep 2026 06:42:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:7312cd88-21ce-4983-9677-50b9f7f20079cistheta07Hi Experts, I am currently working on a high-speed PCB design that requires both Power Integrity (PI) impedance profiling and time-domain transient SPICE simulations . My analysis needs to cover the entire frequency range-from static DC up to several gigahertz. When I run standard AC S-parameter extractions in Hybrid Solvers, the solver extrapolates data at low frequencies ( below 100 kHz down to 0 Hz ). As a result, the low-frequency plane resistance ( R_dc ) isn't accurate, which distorts low-frequency die-bump impedance ( Z_die) plots and results in miscalculated bulk decoupling capacitor requirements. Additionally, if I run transient circuit simulations using these extrapolated models, my SPICE solver often experiences convergence issues due to non-physical DC offsets. How can I configure PowerSI to include an exact 0 Hz static DC point in my S-parameter extractions so I don't rely on mathematical extrapolation? Thankyou in advance.Sigrity