Klayout | 25d View [2021]

In advanced nodes (7nm, 5nm), the metal stack is dense and complex. By assigning heights to Metal 1 through Metal 6, an engineer can instantly visualize the "bridge" structures and via alignments. It is excellent for checking if a guard ring structure is properly enclosing the desired vertical volume.

If you are currently using the 2.5D viewer, ? I can provide more specific tips on: Optimizing the configuration for better visualization. Using net tracing with the 2.5D view.

Once rendering is complete, a new window pops up showing your design in a pseudo-3D perspective.

To use this feature, KLayout must be compiled with . 1. Creating a 2.5D Script klayout 25d view

CMP (chemical-mechanical polishing) requires uniform metal density across each layer. By viewing the layout obliquely, regions with excessive metal in lower layers become visible as "bumps" beneath upper layers, helping the designer identify potential dishing or erosion issues.

Microelectromechanical systems rely heavily on structural height, cavities, and suspended membranes. The 2.5D view makes it easy to see if a structure will release properly.

: The distance from the substrate base to the bottom of the layer. In advanced nodes (7nm, 5nm), the metal stack

Complex MEMS devices, microfluidic channels, and advanced FinFET geometries are notoriously difficult to audit in standard 2D. A 25D extrusion immediately highlights whether a via or contact layer actually intersects the intended metal tracks above and below it. 2. Streamlined Debugging of PDK Stack-ups

A 2.5D script is a variant of the KLayout DRC language. You can use boolean operations (like AND , OR , NOT ) to process polygons before extrusion.

: Each layer is assigned a zstart (base elevation) and a height (thickness). If you are currently using the 2

The name is a precise technical definition: the 2.5D view creates a of your chip layout. It's not a full, continuous 3D model of the process topology. Instead, it takes your existing 2D layout layers and "extrudes" them vertically, assigning each layer a specific thickness and height. Imagine a 2D blueprint of a multi-story building; the 2.5D view lifts each floor up to its corresponding height, turning a flat plan into a stack of extruded shapes.

For the layout engineer, it serves as a powerful sanity check for stack definitions

While many tools are moving toward full 3D extraction and visualization, the KLayout 2.5D approach offers a superior balance of speed and functionality for daily layout work.

KLayout's 2.5D view is a game-changer for verifying complex interconnects and ensuring your mental model of the stack matches reality. Whether you are debugging a via chain or just want a "hero shot" of your latest design, this tool is an essential part of the modern open-source silicon toolkit. Are you working with a specific that needs help with 2.5D script configuration? Colors in the 2.5d View - KLayout Layout Viewer And Editor

This approach is incredibly effective at revealing the between different physical layers of the design, such as metal wires, polysilicon gates, and active areas. This visualization makes it much easier to spot issues like wiring congestion in a 3D space or to understand the physical stack-up of your process.