Klayout 25d View [verified]

KLayout provides a simple lighting model: ambient, diffuse, and specular. Under View Settings > 2.5D , you can adjust light direction, intensity, and shadow softness. For debugging, disable shadows for performance.

Missed via connections or misaligned contact plugs can ruin a tape-out. The 2.5D view makes it immediately obvious if a via fails to drop low enough to hit a lower metal layer, or if it punches too far down. 2. MEMS and Photonics Topology Mapping

If the view looks flat, ensure your Technique (under File > Setup ) has the "Thickness" and "Z-Offset" attributes filled out for your active technology. klayout 25d view

that bridges the gap between flat 2D layout and full 3D process modeling. What is the 2.5D View?

The 25D engine in KLayout takes flat layers (like Diffusion, Polysilicon, Contact, Metal1, and Via1) and vertically stacks them. This allows designers to inspect vertical connectivity, identify step-coverage issues, and visually verify the physical stack-up before sending a mask set to the foundry. Key Benefits of Using 25D View in KLayout 1. Intuitive Structural Verification KLayout provides a simple lighting model: ambient, diffuse,

KLayout doesn't know the "height" of your GDS layers automatically. You must define a using a script. Navigate to Tools > 2.5D View > New 2.5D Script .

Once your 25D window is open, use these interactive controls to audit your design: Navigation Shortcuts Click and drag with the Left Mouse Button. Missed via connections or misaligned contact plugs can

If your oxide layers obscure your metal lines, locate the layer list within the 25D panel. Turn down the of insulating layers to 20% or 30%. This makes the dielectric see-through, leaving your interconnect network clearly visible. Troubleshooting Common 25D Bugs The 25D Window is Completely Blank:

) stretches the vertical axis, making thin metal and oxide layers much easier to distinguish. Best Practices for Layout Designers

MEMS devices rely on suspended membranes, comb drives, and etched cavities. The 25D view allows you to visually verify that sacrificial release layers match the placement of structural layers, ensuring that your bridges or cantilevers are properly anchored. 2. Via Stack and Contact Auditing