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Sonnet User's Guide - Sonnet Software

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Chapter 10 Parameterizing your Project<br />

Equations<br />

As mentioned earlier, a variable may be defined by a constant, another variable or<br />

an equation. An equation is composed of constants and/or variables. Below are<br />

some examples of valid equations.<br />

• 3*3<br />

• 3*pi<br />

• 3*H<br />

• sin(H)<br />

• sqrt(H)<br />

The last three equations are ones in which one variable is used to define another.<br />

This allows you to relate properties in your circuit such that changing one effects<br />

the other, maintaining a set relationship between them. For example, you wish to<br />

define a dielectric layer which is always five times the thickness of your substrate.<br />

To do so, you define a variable “sub” which you would enter as the thickness of<br />

your substrate. Then you would enter “5*sub” as the value for the thickness of the<br />

dielectric layer. There are two methods you may use to do this. The first is to de-<br />

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