Selecting Setup - Units from the main menu in the Cadence Virtuoso Interface opens the Units dialog box which displays the units for Frequency, Length, Conductivity, Resistivity, Sheet Resistance, and Resistance per Via. You select the Frequency unit from the drop list. You can not change the Length unit in the interface. You must change the length unit in the Virtuoso library. All other units are presently fixed and may not be changed.