21.11.2014 Views

Sonnet User's Guide - Sonnet Software

Sonnet User's Guide - Sonnet Software

Sonnet User's Guide - Sonnet Software

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Chapter 17 Thick Metal<br />

Then place a polygon representing the top side of the thick metal on the bottom<br />

side of that dielectric layer using the Thick Metal metal type. Make this polygon<br />

as thick as the dielectric layer.<br />

Thick metal polygon on level 1<br />

where it is drawn and placed on<br />

top of the wider zero-thickness<br />

The same polygon shown on level 0.<br />

Since the thick polygon is the same<br />

thickness as the dielectric layer,<br />

the metal also appears on this<br />

level. Only the outline of the zerothickness<br />

metal is shown on this<br />

level.<br />

Next, place any desired ports on the thick metal polygon, not on the thin metal<br />

polygon. Since the thick metal polygon is placed on top of the zero-thickness polygon,<br />

the two are connected electrically and the port is across both polygons.<br />

A circuit implementing the above transmission line is stored in Thkthru and an example<br />

of a thick step junction is stored in a project called Thkstep. Copies of these<br />

projects can be obtained from the <strong>Sonnet</strong> examples. For directions on obtaining a<br />

<strong>Sonnet</strong> example, select Help ⇒ Examples from the menu of any <strong>Sonnet</strong> program,<br />

then click on the Instructions button.<br />

Thick Metal in the Current Density Viewer<br />

The current density viewer allows you to view the current density distribution in<br />

your circuit. When you select the Compute Current Density option in the Analysis<br />

Setup dialog box in the project editor, em calculates current density data for all the<br />

metal levels in your circuit. When you have thick metal in your circuit which ends<br />

in the interior of a dielectric layer, then the current density viewer creates "sublevels"<br />

of metal in order to display all the current density data.<br />

261

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!