Cooper LP800 Betriebsanweisung PDF herunterladen (Seite 99)

100

101

14 Preparin

a Schematic for Simulation

Usin

Global

Parameters and

Expressions for Values

In addition to literal values, you can use global parameters and

expressions to represent numeric values in your circuit design.

Global Parameters

A global parameter is like a programming variable that

represents a numeric value by name.

Once you have defined a parameter (declared its name and given

it a value), you can use it to represent circuit values anywhere in

the schematic; this applies to any hierarchical level.

Some ways that you can use parameters are as follows:

• Apply the same value to multiple part instances.

• Set up an analysis that sweeps a variable through a range of

values (for example, DC sweep or parametric analysis).

Declarin

and usin

lobal parameter

To use a global parameter in your schematic, you need to:

• define the parameter using a PARAM symbol, and

• use the parameter in place of a literal value somewhere in

your design.

When multiple parts are set to

the same value,

lobal

parameters provide a convenient

way to chan

e all of their values

for “what-if” analyses.

Example: If two independent

sources have a value defined by

the parameter VSUPPLY, then

you can chan

e both sources to

10 volts by assi

nin

the value

once

to VSUPPLY.

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