Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> If the via to ground is added when there are multiple intervening metal levels between the present level and ground, the via polygon can be seen on each level. The intervening levels have via arrows pointing in both directions to indicate that the via extends both upward and downward. Below is shown a rectangular via polygon extending from metal level 0 to ground in a three level circuit. Level 0 Level 1 Level 2 Gnd The via shown above extends from level 0, the highest metal level in the circuit down to the ground level. The via arrows on the rectangular via on level 0 point only in the downward direction. The via polygon appears on levels 1 and 2 in the same position but with via arrows pointing in both the upward and downward position indicating that the via extends in both directions from these levels. Only the outline of the via polygon is drawn on the ground plane to indicate its position with the via arrows pointing upward indicating that the via extends upward. Since the complete ground plane is metalization, the via polygon is drawn simply as a reference for the user. Note that the center of the via polygon is not metalization but is a rectangular cylinder of dielectric material. Multi-layer Vias It is possible to have a via which traverses more than one dielectric layer. You may insert a via in your circuit originating on any level and ending on any level. The via is automatically drawn on each level it traverses. To create a multi-layer via, 248
Chapter 16 Vias and 3-D Structures first create a via in your circuit, then modify its properties. For example, you have a four level circuit with an existing via polygon which extends from level 1 to level 0 as shown below. Level 0 Level 1 Level 2 If you want to modify this via such that it extends from level 0 to level 2, you would do the following: 1 Right-click on the via polygon on any level on which it appears. A pop-up menu appears on your display. 2 Select Properties from the pop-up menu. The Via Properties dialog box appears on your display. To: Level drop list 3 Select “2” from the To: Level drop list. The via originates on level 0 which you do not wish to change. Selecting 2 from the drop list changes the via so that it goes down to level 2 instead of level 1. Notice that the number of levels is updated from 1 to 2. 249
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