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Example : Schematic Capture (CMOS Inverter) Step 5 : Edit properties of components
The components you select and place from the library always come with a set of default parameters or properties. You can (and usually should) modify component properties according to your design specifications. Here are the steps to edit component properties in the schematic window.
1. Select the PMOS transistor by clicking on it .
The selected component should be highlighted by a bright rectangle (box) around it.
2. Choose Properties and then Object from the Edit menu.
A larger window with many editable fields appears which is called the Edit Object Properties window.
3. Edit the properties by clicking on the corresponding field.
You may change the values for Width or Length depending on your design specifications. Usually, you will change only the Width value, which stands for the channel width, W. The default values for these properties are the smallest available values which are determined by the current technology.
To edit the channel width of the transistor, click on the Width field. Then enter a new value which is either a result of your calculations or just an initial value to see how the performance changes depending on this variable. While changing a parameter, you have pay attention to the unit you use (click here for the list of units). The channel width is changed to 1200 nm (nanometers) which is equal to 1.2 um (micrometers).
4. Click OK after editing the properties in the Edit Object Properties Window.
The most important parameters (type, dimensions) always appear in the schematic window. You can easily observe the changes of these properties that are listed near the corresponding transistor in the schematic.
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Last Updated by Ilhan Hatirnaz on 10/31/1998