Characteristic Impedance

Learn how vital characteristic impedance is to the integrity of your schematics

Why does characteristic impedance matter?

When looking at transmission lines one of the most vital parameters is characteristic impedance. This video presented by Jane Berrie explores how to calculate characteristic impedance, and how important it is to your PCB designs.

Key aspects of characteristic impedance:

  • High-speed signaling must conform to official standards and characteristic impedance is a key part of this, it’s important to get it right as impedance tolerances are tight
  • Formula-based calculations are imprecise so a field solution is needed, some board manufacturers specify track widths for impedance control in standard layer stack-ups
  • If this matches your requirements then it’s your best guide, because it takes details of their process into account

Jane Berrie
Jane BerrieElectronic Design Technology Partner
Jane Berrie is an EDA product innovator and technical marketing content creator, focusing on high-speed design and signal integrity. She is a published author of technical articles and a past session chair at the annual Design Automation Conference (DAC).

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