Before we get into the layout, first you need to understand the design rules for layout. In this tutorial, you will learn how to perform manual layouts and a simple inverter layout will be shown. Creating Full custom Layouts using Cadence' Virtuoso Layout Editor.Cadence Tutorial D: Using Design Variables and Parametric. Access the properties for PMOS by selecting it and pressing ‘q’. Open the inverter schematic (or create a new one to preserve the functionality of previously-designed circuits) 2. Cadence Tutorial D: Design Variables and Parametric Analysis 3.