AXIEM Concepts

Homework 1: Setting up AXIEM Edge Ports

• Set up the project: Enclosure settings
• Drawing and deembedding ports
• Looking at the mesh
• Implicit and explicit grounding schemes
• A finite sized ground and ports

Lecture 1: Ports in AXIEM

• Types of ports in moment method simulators
• Calibration and deembedding
• The ground in edge ports
• Implicit and explicit grounding in AXIEM
• Example: An open line with one port
• A bend over a  finite ground example with implicit and explicit ports
• The implicit ground and current return

Homework 2: Deembedding Ports and Meshing

• The assumptions of deembedding
• A failed calibration - a via with too short a line
• Meshing and decimation
• A decimation example - a circular pad

Lecture 2: New Ports in AXIEM Version 9

• Edge ports in version 9
• The internal edge port
• The assumptions of calibration
• The calibration structure
• A bad calibration
• Coupled line deembedding
• Groups and mutual calibration
• Coupled lines - differential ports versus calibrated ports

Homework 3: Simulation

• Simulation in AXIEM
• Testing your machine
• Making the problem bigger
• Iterative versus direct solvers

Lecture 3: Meshing and Solver Options

• Series (Internal) ports
• Engineering tradeoffs and the mesh
• How does AXIEM set the mesh?
• The mesh and boundaries
• Decimation
• Controlling decimation
• Typical decimation issues
• Controlling the mesh
• Green's functions
• Making the matrix
• Theoretical solution time
• The matrix fill ~ N²
• The matrix solve ~ N³
• Compressed Iterative Solvers - the idea
• Iterative solvers and conditions
• Poor conditioning - a thick line not very thick
• Poor conditioning - low frequency and the "DC Catastrophe"
• Loop - Star pre-conditioning to fix the low frequency problem
• Other pre-conditioners
• Setting the solvers
• Balancing the pre-conditioner size and the number of iterations