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What post-layout simulation checks
Pre-layout analysis works from schematic or topology information to explore design choices and set constraints. Post-layout analysis uses routed layout data to evaluate the implementation that will be fabricated. The distinction matters because routing, interconnect geometry, and neighboring nets affect electrical behavior that a schematic alone cannot represent.
Depending on the tool, board data, and analysis setup, post-layout checks can include impedance, reflections, crosstalk, interface behavior, and extracted interconnect analysis. A board-level result is only as representative as its routed data, models, and selected simulation conditions.
Signal integrity
Signal integrity (SI) concerns whether signals arrive with acceptable electrical behavior. Typical checks include impedance and reflections, crosstalk between coupled routed nets, and interface-specific behavior. Altium documents schematic-based preliminary impedance and reflection analysis as well as board-level impedance, reflection, and crosstalk analysis. Its documentation specifies that routed nets are required for crosstalk analysis. Altium’s Signal Integrity Analyzer documentation also describes SI screening through the design-rules process.
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Power integrity
Power integrity (PI) evaluates power-delivery behavior rather than signal transitions. The scope can include DC and AC analysis. Cadence documents DC results visualized as voltage, voltage drop, or current density; Siemens describes DC and AC power-delivery analysis. SI and PI are related because they concern electrical behavior on the same board, but they answer different questions and call for different analysis setups.
How to run analysis across the design cycle
Post-layout simulation is most useful as part of an iterative process, not as a final pass detached from design decisions. Begin with early checks that can guide topology and constraints, then verify the routed implementation and increase analysis depth where risk warrants it.
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- Explore before routing. Use schematic or topology-level analysis to assess preliminary impedance and reflections, set constraints, and reduce avoidable rework. Altium documents schematic-only preliminary checks; Cadence describes pre-layout analysis.
- Run checks as routing develops. Use available rule-based or in-design screening to flag likely issues while changes are still practical. Siemens describes progressive verification, beginning with quicker rules-based checks and moving toward detailed simulation. Cadence documents in-design analysis.
- Verify the routed board. Run board-level SI or PI analysis against the available layout and connectivity. Check that the relevant nets are routed and the PCB data and related design documents required by the tool are available. Altium says PCB-project SI analysis requires the PCB document and related schematics.
- Escalate analysis for critical or unresolved risks. Use more detailed model-based or electromagnetic analysis where a fast check is insufficient, such as for critical interfaces or problems that remain unexplained. Siemens describes layout extraction and 2D, 2.5D, and 3D electromagnetic modeling among HyperLynx capabilities.
- Change the design and rerun affected checks. Evaluate whether the routed implementation meets the board’s requirements, revise the layout when needed, and rerun analyses affected by the change.
A simulation result does not by itself prove that a board will work in every operating condition. The result depends on the design representation, model quality, analysis configuration, and requirements used to judge it. Siemens also notes that rule-check flags need review and appropriate action; a flag is not automatically a confirmed failure.
Compare tools by workflow fit, not by a universal ranking
Vendor documentation establishes what a product says it supports, not which product performs best in an independent, controlled comparison. Compare the workflows against your board and team rather than treating feature lists as a benchmark.
The Tool Desk
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| Tool | Vendor-documented scope relevant to post-layout work | Workflow considerations |
|---|---|---|
| Siemens HyperLynx | Siemens describes a family spanning schematic and PCB verification, rules-based checks, SI, PI, and advanced solvers. Its overview discusses staged verification, layout extraction, and 2D, 2.5D, and 3D electromagnetic modeling. | Consider whether the available verification stages and solver depth match your design risks and how your team will review rule flags and simulation results. Siemens HyperLynx overview |
| Altium Designer Signal Integrity Analyzer | Altium documents schematic-based preliminary impedance and reflection checks, plus board-level impedance, reflection, and crosstalk analysis. Crosstalk analysis requires routed nets. | Consider the value of SI screening within the design-rules workflow and whether the PCB document, related schematics, and routed connectivity needed for your checks are available. Altium documentation |
| Cadence Sigrity / Sigrity X Aurora | Cadence documents SI/PI analysis for PCB and package designs. Aurora’s datasheet describes pre-layout, in-design, and post-layout analysis, extracted interconnect modeling, and DC PI visualization. Cadence lists interfaces to databases from Cadence, Mentor Graphics, Altium, Zuken, and AutoCAD. | Check whether the specific product and workflow support your design database, required analyses, and team handoffs. The documented database interfaces do not, on their own, establish import effort or compatibility with every project. Cadence Sigrity overview and Sigrity Aurora datasheet |
What to evaluate in a tool
Use a representative board and the interfaces that matter to your team when comparing workflows. These questions help expose differences that a headline feature list may hide:
- PCB database support: Can the tool work with your PCB editor’s data, and what import, export, or handoff steps are required?
- SI and PI scope: Which checks are available for your design, and can you analyze both signal behavior and power delivery where needed?
- Interface and protocol coverage: Does the analysis address the interfaces on your board and the questions you need to answer?
- Extraction and solver options: What interconnect extraction or electromagnetic modeling options are offered, and when would your team need them?
- Models and setup burden: Are suitable models available, and what work is required to configure them and interpret the results?
- Automation and review: Can you combine quick rule-based screening with simulation-based analysis, and how are flags and findings reviewed?
- Reporting and iteration: Can designers understand the findings, update the layout, and rerun the relevant checks without an awkward handoff?
- Team fit: Does the workflow integrate with your current PCB editor and match your team’s analysis skills?
Match analysis depth to board risk
Not every board needs the same analysis effort. A practical approach is to start with checks that catch likely issues early and reserve more detailed modeling for the interfaces and power-delivery areas where a failure would matter most, or where simpler checks leave uncertainty.
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For a board with modest electrical constraints, progressive rule-based and board-level checks may provide an appropriate starting point. For critical or tightly constrained interfaces, unresolved SI questions, or significant power-delivery concerns, the team may need more detailed model-based or electromagnetic analysis. This is a planning framework, not a claim that any one tool or analysis level guarantees success.
Choose the tool whose documented analyses and data workflow cover your board, then confirm that the team can supply appropriate design data and models, interpret the findings, and iterate on the layout. Siemens HyperLynx, Altium Designer’s Signal Integrity Analyzer, and Cadence Sigrity/Aurora document different combinations of these capabilities; the available vendor pages do not establish an independent winner.
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