CAO routing of an electronic board with fast signals

When CAD routing of a electronic board with rapid signals , it is important to proceed in stages and analyze them. Indeed, it is necessary to understand the operation of the electronic card in order to be able to implant it correctly. Each component of the electronic board must have a specific location. The impedances of the differential transmission lines must be calculated with precision for their operation. HDI routing is imperative, and therefore represents a critical point during the design of the electronic board and thus adds an additional constraint. To provide more precision during the CAD routing phase with fast signals for example, Anthémis Technologies uses the Altium designer software . For example, it allows the 3D image to be integrated into a printed circuit to optimize its integration.

Here are the main steps in designing an electronic card with fast circuits:

Step 1 – Analyze the component datasheet.

Step 2 – Depending on the component, we can find several cases

  • Differential pairs with a given impedance
  • Simple links with a given impedance
  • A single link bus with a given impedance but the same length as those cis.

Step 3 – Analyze the impedances in the component datasheet.

the most common impedances are 50 ohms, 80 ohms, or 100 ohms.

Step 4 – After analyzing the components and the complexity of the diagram we define the printed circuit with the number of layers necessary for the routing of these signals and on which layers these signals go.)

Step 5 – Depending on the stacking chosen and the impedances there are calculations to be carried out to define the widths of the links layer by layer. There are several cases

Anthémis Technologies provides you with its knowledge and know-how for the routing of your electronic cards. Expert in this sector for over 15 years, we support you in all stages of your project.

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