For custom layers, a blank setup can be used without any default layers, as described in
Tutoria
With the creation of a new file, the user is presented with a layout area entitled Cell0,
prese
Use the arrow keys to display different parts of the design in the viewing window. Also, the
l #1: NMOS Design & Layout. Layers can be selected on the sidebar with either their
representative icon or from the list above the icons. Note that the names of layers are functionally
irrelevant, and serve only to clarify the design – in reality, all layers are simply translated to
geometry and the layer names discarded when the file is exported to GDSII.
re nting the first “cell” within his or her design (Cells will be explained in further detail in
section 4). Figure 2 shows the layout area of this Cell0. The layout area is where all of the design
takes place – the user selects appropriate geometry from the toolbar, such as a rectangle; a layer,
from the sidebar, and draws it on the layout area. As the object is drawn, the status bar at the bottom
left of the screen will display the drawn width and height, and area of the object. The drawn object
can subsequently be resized by left-clicking on the object to select it, and then clicking down with
the mouse scroll wheel on the corner of the object and dragging it. The status bar will update to
reflect the change in size. The object can be repositioned by clicking near its center with the mouse
scroll wheel and dragging it with the mouse. Finer movement can be achieved with the Draw Æ
Nudge dialog, which allows movement in any direction with three decimal places.
view can be zoomed in/out by clicking anywhere outside the drawing with the left mouse button, and
then rotating the scroll wheel on the mouse while holding Ctrl on the keyboard. The display of the
grid can be toggled within this viewing window by selecting Setup Æ Design and selecting the Grid
tab. Note that under the Technology tab there are settings for the units used in the design. The
settings under Grid control the distance between grid points as well as whether the mouse snaps to
this grid. If the Suppress major/minor grid is set too large in this dialog, the grid will likely not
appear unless the view is zoomed fully in (again to scroll, use the middle mouse button). Finally,
note that the origin (x,y = 0) appears as a cross symbol on the drawing area (see figure below).
Figure 2. Cell0 Window
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