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SI/PI

Signal & Power Integrity

When designs become smaller, faster, and more complex, ensuring stable signal transmission and power delivery becomes increasingly challenging.

As an electronics engineer, understanding and addressing signal & power integrity issues is critical to your design’s performance. It can mean the difference between a successful product and failures during production or in the field.

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Do you recognize these challenges?

Signal transmission is affected by noise, crosstalk, or electromagnetic interference (EMI).

Power delivery to components is unstable or inefficient, leading to operational issues.

Reflections and signal delays cause problems in high-frequency circuits.

Minimizing losses and ensuring proper impedance matching in the design is difficult.

Supply voltage fluctuates unacceptably due to voltage drops or transients.

The design requires multiple iterations to resolve signal or power-related issues, delaying projects and increasing costs.

How to solve it

Simulation on schematic level
Simulation on PCB level
Simulation on simulation level

Solve issues before they reach your PCB

Simulating signal and power integrity at the schematic level helps you identify potential problems early in the design phase. Using advanced SPICE-based simulators, you can evaluate your circuit and ensure it performs reliably under realistic conditions.

You can:
Test circuit performance under different operating conditions, such as variations in current and voltage with component-level simulation.
Detect critical impedance mismatches to prevent signal reflections or loss with impedance analysis.
Harness the power of distributed simulation to handle large, complex designs without compromising speed or accuracy.
Sigrity
Challenge
Solution
Design flaws are identified too late in the process.
Simulate early at the schematic level to discover and resolve issues before they escalate.
It’s hard to predict how components behave under load.
SPICE simulations provide accurate predictions of component behavior under various scenarios.
Uncertainty about signal integrity in the circuit’s foundation.
Simulate impedance, voltage variations, and signal quality directly at the schematic level.

Optimize signal & power integrity in your layout

Once the schematic is ready, the next step is to analyze signal and power integrity at the PCB level. Tools like Allegro PCB Designer and PowerDC enable you to evaluate how your layout impacts both signal and power delivery performance.

You get:
Impedance and crosstalk analysis to minimize EMI, crosstalk, and other layout-related challenges.
Power plane analysis to assess the stability of your power distribution network and DC drops in real-time.
In-design analysis to seamlessly integrate simulation into your layout design process to validate changes instantly without switching tools.
Sigrity, signal & power integrity
Challenge
Solution
EMI and crosstalk degrade signal integrity.
Analyze the PCB layout to reduce noise and minimize interference between traces.
Power delivery stability is challenged by DC drops and impedance issues.
Simulate the power distribution network to ensure consistent power supply to all components.
Signal timing and quality are impacted by the layout.
Validate signal timing with eye diagrams to achieve optimal performance.

Understand your design’s overall performance

System-level simulation allows you to evaluate the interactions between multiple PCBs, modules, and systems. This ensures that your overall design functions optimally under real-world conditions, reducing the risk of unforeseen issues.

You get:
Cross-domain analysis to simulate interactions between PCBs and power supply systems to identify bottlenecks.
High-frequency analysi to evaluate signal performance in complex networks with high-frequency circuits.
System-level analyses to optimize power distribution and signal performance across your entire system to eliminate inefficiencies and inconsistencies.
Sigrity
Challenge
Solution
Lack of insight into the system’s overall performance.
Simulate system interactions to understand and optimize the bigger picture.
Inefficient power delivery causes variations and instability.
Evaluate the entire system’s power distribution network to address issues.
Complex designs lead to unforeseen issues.
Simulate at the system level to identify and resolve problems before production.

Learn to how to enable faster and more accurate system-level SI/PI analysis

    Electrical/thermal analysis in the DC domain

    With Cadence® Sigrity™ PowerDC™, you get added accuracy of electrical/thermal co-simulation, as well as the assurance that your PDN performs as expected. With PowerDC, you can easily locate accidental voltage losses, high current densities, via with excessive currents and thermal hotspots. All these effects can significantly affect the quality of the design and limit the life of the product.

    Sigrity, signal & power integrity

    Identify critical points

    Identify critical points in the layout where narrowings in traces or planes give too much current density and easily find the one among thousands that is the weakest point.

    Detailed analysis

    Perform detailed analysis of stackup parameters such as copper thicknesses and number of layers without risking electrical or thermal problems.

    Fast and accurate

    Avoid errors with a very accurate simulation and go into details in every detail of the design. 

    Complete frequency characteristic and optimisation of PDN

    With Cadence® Sigrity™ OptimizePI™, you get insight into how the PDN frequency characteristics look for each individual component, including the planes shape and placement in the stackup, decoupling their routing and placement, as well as routing from supply plans to components. Decouplings can also be optimised in terms of price vs. performance and verify EMI performance by measuring impedance for self-selected locations on the layout.

    • Avoid costly over-design of PDN based rules or data sheet descriptions
    • Optimise the PDN based on the actual layout instead of a simplified model in a spreadsheet
    • Unique possibility for analysis of PDN impedance for components and EMI resonance for planes
    • Make fast assessments of PDN performance based on easily accessible results

    Power-Aware signal integrity

    Simultaneous switching noise (SSN) can change the timing on a memory interface. 

    With Sigrity™ Power-Aware SI, you get a complete solution for analysing source-synchronous interfaces used for e.g. DDR3 and DDR4 memory interfaces. 

    Power-Aware SI includes both tools for layout extraction of traces and supply voltage, as well as intuitive simulation tools for parallel bus analysis that can generate reports with information on time margins being met according to the JEDEC standard.

    Simultaneous Switching noise (SSN)

    Simultaneous switching noise (SSN) can change the timing on a memory interface.

    Intuitive simulation tool

    Power-Aware SI includes both tools for layout extraction of traces and supply voltage as well as intuitive simulation tools for parallel bus analysis that can generate reports with information on time margins being met according to the JEDEC standard.
    Sigrity

    Serial link analysis

    Perform chip-to-chip analysis on highspeed SerDes interfaces, such as PCI Express® (PCIe®), HDMI, SFP+, Xaui, Infiniband, SAS, SATA, and USB with industry-standard IBIS AMI models.

    You can run pre-layout analyses using templates, and add models of component packages, connectors, and layouts to reflect the entire interface.

    Run simulations to identify crosstalk problems and show the signals in the interface, as well as signals after clock and data recovery (CDR), which are described in the IBIS AMI model.

    By simulating the complete interface with millions of bits, the overall bit error rate (BER) can be calculated to determine whether jitter and noise levels are within specified tolerances.

    Resources

    Webinar

    Highspeed design - Return path and stackup

    Watch the webinar →

    E-book

    Redefining Signal and Power Integrity

    Read the book →

    Webinar

    Save time and money with simulation

    Thermal simulationWatch the webinar →
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