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Correct Width

This check determines if the traces in a single-ended impedance net are within a provided tolerance of the desired width provided by the board stackup.

Updated over a month ago

Description

  • Overview: This check determines if the traces in a single-ended impedance net are within a provided tolerance of the desired width provided by the board stackup

  • Passing Criteria: This check passes if the length of trace segments that are outside the width tolerance falls below an acceptable percentage

  • Reporting Units: Length Percentage

Examples

Passing Message:

Trace length outside width tolerance of 3.7% within acceptable range (0% to 10%)

Failing Message:

Trace length outside width tolerance of 26.1% outside acceptable range (0% to 10%)

Physics Justification

  • Controlled Impedance:

    The trace width, combined with the dielectric material and distance to the reference plane, determines the impedance. Incorrect width can cause reflections, signal distortion, and degraded signal integrity.

  • Current Carrying Capacity:

    Trace width affects how much current the trace can safely carry without excessive heating. Too narrow a trace can lead to overheating and potential damage.

  • Electromagnetic Interference (EMI):

    Proper trace width minimizes EMI by maintaining consistent transmission line behavior, reducing noise and radiation.

  • Design Consistency:

    The layer stack defines the PCB's physical and electrical properties, so deviating from specified widths can misalign with the expected performance.

Helpful Definitions

  • Electromagnetic Interference (EMI)
    Unwanted electromagnetic radiation or coupling that disrupts the operation of nearby electronic devices or circuits.

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