Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide fine another variable “die_thick” which you define as “5*sub” and the second is to simply enter the equation “5*sub” as the thickness of the dielectric layer. You may enter an equation in any field in which you may enter a variable. In this case, only one variable “sub” is defined and the equation “5*sub” is entered directly in the Dielectric Layers dialog box as the thickness of the dielectric layer. The only variable which appears in the Variable List (opened using the command Circuit ⇒ Variable List) is “sub.” In this case, two variables are defined: “sub” and”die_thick.” The value entered for the variable “die_thick” is the equation “5*sub.” Both variables appear in the Variable List. Available functions for equations include: • Operators such as addition, subtraction, multiplication, etc. • Logarithmic functions • Complex Math functions • Trigonometric functions • General Mathematical functions such as maximum or minimum • Conversion functions for converting units • Table function to use for data lookup There are also constants available for equations including project constants such as the cell size and box size and the frequency which is discussed more below. 134
Chapter 10 Parameterizing your Project For complete details on all the functions and constants available for equations and their syntax, please refer to the equation syntax help topics in Help. You may access these topics by clicking on the Equation Syntax Help button in the Add/Edit Variable dialog box. If you enter an equation which uses a variable as the definition of another variable, then the variable defined by the equation is dependent on the variable used in the equation. This is discussed later in the chapter, in "Dependent Variables" on page 135. Frequency Dependency There is a frequency constant, FREQ, available for use in Sonnet equations. This allows you to model properties whose characteristics are frequency dependent such as a dielectric. It is important to be aware that if a variable uses the FREQ constant in its definition that the value of the variable changes during the analysis even if the variable is NOT selected for the parameter sweep or optimization. Dependent Variables One variable is dependent upon another if the value of a variable is defined by an equation that uses another variable. As the value of the variable in the equation is changed, so is the dependent variable. If a variable is dependent, you may not directly edit its nominal value; instead, you change its value by changing the value of the variable on which it is dependent. You may not delete a dependent variable. If you wish to delete it, you must first remove the dependency by changing the definition of the dependent variable. Variables which do not depend on another variable for their value are independent variables. Only independent variables may be selected for a parameter sweep. To vary a dependent variable in a parameter sweep, you must select the variable on which it depends. For more details on parameter sweeps, see "Parameter Sweep" on page 148. Circular Dependencies in Variables Care should be taken when adding dependent variables to your circuit that they do not form a circular dependency. A circular dependency is formed when two variables are dependent on each other. This can happen for two variables or multiple variables. In the case of multiple variables, the dependency extends from the first variable through all the variables until the first variable is dependent upon the last. 135
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