Contents

Overview
• Introduction
• Applications
• Input
• Outputs
    GDSII
    Ansoft ANF
    Optimal XFL
    OEA Netan
 
Running NETEX
• command syntax
 
Proximity Nets
• What is a Proximity Net?
• Why Would I Need It?
• How it Works
 
When Net Names Collide
• Different Net Names
   on Same Conductor

• Separate Conductors
   with Same Net Name

• Log file reporting
 
Layers and Datatypes
• What is a GDSII Datatype?
• How to Separate Entities
   by Datatype
 
The Technology File
• Conductor Stackup
• Assigning Net and Node
   Names using Text Layers

• Conductor Name Mapping
 
The Configuration File
• Data Units
• Expansion
• Output Directory
• Temporary Directory
• Extraction Directives
     • All
     • Bycoordinate
     • ByName
 
Saving Intermediate Results
• The GDSII file with all nets
• How Last State is Saved
 
 

Typical NETEX Applications

Spice Modeling and Parasitic Extraction

We originally wrote NETEX as an efficient way to select certain critical nets from a GDSII file so that a designer could then use a field analysis program to obtain an equivalent model.

A 3D field program is computationally intensive and it only makes sense to work on the particular areas of interest - not on the entire chip. NETEX can handle very large chips efficiently, and pull out the desired nets along with nearby metal needed for fringing capacitance calculations.

See the new application note on how NETEX can be used to extract large VDD/VSS nets for dynamic impedance simulations ...

Reliability and Failure Analysis

Later we found designers involved in failure analysis interested in NETEX because it made it easier for them to map the surface of their chips. The output from NETEX can be used in conjunction with our Qkcvu program to highlight all metal connected to a particular net -- something very useful when you are trying to probe from the surface of the chip.

Design Analysis

Finally some design engineers found NETEX and Qckvu to be useful when viewing the GDSII files because it gives them a way to view a design by net. They can bring up a view that shows all traces and vias connected to a single net.





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