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Sonnet User's Guide - Sonnet Software

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Chapter 6 Components<br />

1. No objects may be placed within the “restricted space” in the<br />

interior of the Component: Metal polygons, vias, or dielectric bricks<br />

may be present in the rectangular area defined by the port locations and the<br />

terminal width, as illustrated below. The bottom circuit shows the restricted<br />

area in a multiport Component.<br />

Right<br />

Wrong<br />

Illegal<br />

Polygon<br />

The dashed boxes identify the “restricted space” for each<br />

Component. On the circuit labeled “Wrong” a metal polygon<br />

passes through the middle of the restricted space.<br />

Restricted<br />

Space<br />

2. Components whose ground node connections are defined as the<br />

<strong>Sonnet</strong> box require direct access to the <strong>Sonnet</strong> top or bottom<br />

cover. The analysis engine determines the most efficient direction the<br />

ground via extends taking into consideration both the distance and the loss of<br />

the box top or bottom. When using this type of ground, you must make sure<br />

that there is a clear path with no metal on other levels interfering with the path<br />

to either the box top or box bottom.<br />

In addition, the box top or bottom should not have loss greater than 50 ohms/<br />

sq. If the loss is too high on both the box top or bottom for a ground via from<br />

the Component to be attached, the analysis engine issues an error message.<br />

93

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