Patent ID: 7277841

Claim:
An adaptive subgridding method for power/ground plane simulations, the method comprising: superimposing a grid of cells onto a representation of a circuit plane; determining a fill ratio of each of the cells of the grid, wherein the fill ratio represents an amount of cell area that overlaps with the circuit plane; for each cell having a fill ratio of less than a predetermined upper limit and greater than a predetermined lower limit: dividing the cell into subcells; determining the fill ratio of each of the subcells; for a subcell having a fill ratio of less than the predetermined upper limit and greater than the predetermined lower limit, subdividing the subcell into a plurality of smaller subcells; and repeating said determining the fill ratio and subdividing the subcell until a predetermined integer value is reached; creating a circuit model based on said superimposing, said determining a fill ratio for each of the cells, said dividing, said determining the fill ratio of each of the subcells, said subdividing, and said repeating, wherein the circuit model is used in a system to simulate operation of an electronic circuit.