Sonnet User's Guide - Sonnet Software

Sonnet User’s Guide
Adding a Via to Ground
A via to ground can be added from any metalization level. To add a via to ground,
go to the level from which you wish the via to extend downwards and perform the
following:
1 Select Tools ⇒ Add Via ⇒ Down to Ground from the project editor menu.
Any vias subsequently added to your circuit will extend from the level to which
they are added down through all intervening levels to ground.
2 Select Tools ⇒ Add Via ⇒ to add the desired type of via.
The command places you in an add via mode; the type of via is dependent on the
command you selected. Draw the desired via. The via you input is drawn on the
present level and vias are drawn on each level below up to and including the
ground plane at the bottom of the box. If you wanted to add an edge via, you would
first have had to drawn a metal polygon to which to attach the edge via. An
example of a via polygon going from level 0 to ground in a two level circuit is
pictured below.
The via polygon metalization is shown on Level 0. Note that the arrows are pointing
down, indicating the direction of the via. The center of the via does not contain
metalization but is filled with the dielectric of the dielectric layer. The ground lev-
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