Bondwire Design for Accurate Electromagnetic Simulation
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Solution Overview
Problem
Current technologies are inefficient in modeling the electromagnetic behavior of bondwires in semiconductor packages, as existing EDA tools cannot accurately and quickly simulate bondwire interconnects in three dimensions, leading to high computational costs and lack of integration with IC design.
Innovation Solution
A method and apparatus for designing and modeling bondwire interconnects by segmenting them into discrete components, calculating electromagnetic characteristics, and representing them as a netlist of lumped circuit elements, allowing for faster and more efficient simulation and integration with IC models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerical electromagnetic modelling methodologies (Maxwell's equations, MoM, FEM, FDTD) are used to model bondwires, then wide applicability and accurate electromagnetic behavior are achieved, but simulation time and memory consumption become extremely high
Solution Approach 1:
The bondwire is divided into multiple discrete segments along its length. Each segment is modeled using simplified electromagnetic formulas rather than full-wave numerical solutions. This segmentation allows the complex 3D electromagnetic problem to be broken down into manageable sections that can be computed much more quickly while still capturing the essential electromagnetic behavior of the entire bondwire structure.
Solution Approach 2:
The patent transforms the electromagnetic modeling approach by changing from solving Maxwell's equations directly to using equivalent circuit parameters (inductance, capacitance, resistance) calculated from geometric parameters. This parameter transformation enables faster computation by using closed-form or semi-closed-form solutions based on segment geometry rather than iterative numerical electromagnetic solvers.
2Measurement precision
If numerical electromagnetic modelling methodologies are used to model bondwires, then accurate electromagnetic behavior is achieved, but memory consumption becomes extremely high
Solution Approach 1:
By segmenting the bondwire into discrete sections, each with its own equivalent circuit model, the patent reduces the overall computational burden. Instead of creating large matrices that require substantial memory for full-wave simulation, the segmented approach uses smaller, localized calculations that consume significantly less memory while maintaining acceptable accuracy.
Solution Approach 2:
The patent replaces the mechanical/mathematical system of full-wave electromagnetic solvers with an equivalent circuit model approach. This substitution uses electrical circuit theory (RLC networks) to represent electromagnetic behavior, which requires far less memory than numerical electromagnetic field solvers while providing sufficient accuracy for most practical applications.
Data Source
AI summary
A system and method of designing the physical shape of and determining the electromagnetic characteristics of a bondwire in an electrical circuit, comprising the steps of enabling a user to define the position of the bondwire in the electrical circuit layout, defining the position and loop shape of the bondwire in a 3D representation of the electrical circuit, segmenting the bondwire into discrete segments, determining the electromagnetic characteristics of each of the bondwire segments thereby to determine the overall electromagnetic characteristics of the bondwire.