Standard Cell Filler Integration for IC Uniformity

The patent extracts the problematic gaps from the logical circuit layout and replaces them with dedicated filler cells. These filler cells are specifically designed to occupy empty spaces without disrupting the functional logic, thereby achieving uniformity while preserving design efficiency.

The patent introduces different types of filler cells (standard filler cells and edge standard filler cells) with specific local characteristics. Standard filler cells are used for internal gaps while edge filler cells handle boundary conditions, allowing each region to be optimized for its specific requirements and achieving overall uniformity.

The patent identifies and extracts empty spaces from the circuit layout that would otherwise reduce density. By filling these extracted spaces with appropriately designed filler cells containing transistors, gates, and interconnect structures, the overall device density is increased without compromising design efficiency.

The patent changes the parameters of the filler cells based on their location and function. Edge standard filler cells have different configurations than internal standard filler cells, optimizing transistor count, gate structure, and interconnect arrangement to maximize density while maintaining design flexibility.

The patent designs filler cells with universal characteristics that allow them to serve multiple purposes: filling space, maintaining density, and providing regular structural patterns that facilitate automated design processes. The same basic filler cell structure can be applied throughout the circuit, reducing the need for multiple specialized cell types.

The patent segments the filler cell library into distinct, well-defined types (standard filler cells and edge standard filler cells) with clear usage rules. This segmentation organizes the complexity into manageable categories, making it easier to select and implement the appropriate filler cell type without overwhelming design complexity.