How do I create a thin film resistor?
Creating a thin film resistor is a two step process.
First, you should create a metal type by selecting Circuit => Metal Types then clicking on the Add button in the Metal Editor dialog box which appears. Then select ''Resistor'' for the type. You can then enter the surface resistivity (Rdc) in ohms per square. If you do not know the surface resistivity, but you know the total resistance, you can calculate it by using the formula
For example, a 100 ohm resistor which is 64 mils long and 32 mils wide (2 squares), requires a resistivity of 100/2 = 50 ohms/sq.
If you have not already done so, you should draw a polygon (usually a rectangle) that represents the size and shape of your resistor.
Finally, you should assign the new resistor metal type to your polygon. To do this, double-click the polygon. This pops up the Metal Properties dialog box which allows you to assign the new metal type to your polygon (select the new type from the metal drop list).
