Shielding Vias in CR-8000 Design Force

Tech Tip: Using Enhanced Reinforce Via Functionality to Add Shielding Vias in CR-8000 Design Force

In her recent blog post, Sandy Jones introduced the new reinforce via functionality in CR-8000 Design Force. Here is one very useful application of that new functionality.

Design Force features an option to shield signals when creating their routes. The shield option automatically inserts shielding side by side, above and below, or on all four sides of the signal being routed. Figure 1 shows a signal (blue trace in the middle) shielded on all four sides by the green conductors, which are connected to the ground.

Shielding Vias in Design Force

Figure 1. A signal (blue) is shown shielded on four sides by ground conductors (green).

The 2018 Reinforce Via command now makes it simple to finish the shielding by adding vias all around the perimeter of this structure. On the ribbon, select the Track tab and locate the Padstack function. The Padstack function is also available in the Home tab. In the form that opens, select the option for Reinforce Via. As you’ll see in the parameters dialog, there are options to generate via patterns inside only, outside only, and both inside and outside. To generate the shielding vias, select the outside only option.

In the movie below, I specify various gaps between via centers, and I specify a distance of .015mm from the edge of the shield conductor to the via center. I then select the top and bottom layers and an image of the via pattern is shown. I can modify the pitch value to see what it looks like. Once I’m happy with the results, I click Execute to generate the vias.

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Tom Whipple is a Solutions Architect in the Zuken SOZO Center. He has been with Zuken since January 2017. He previously worked for Cadence and VLSI Technology. He has Master of Science and Bachelor of Science degrees in Electrical and Computer Engineering from University of Arizona and Brigham Young University respectively.

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