Modgen Dummies

Dummy devices are created to counter electrical effects that are observed at small geometries. You can create dummies around devices in Modgens.

A device instance is considered a dummy if one or more of the following conditions are met:

• The instance has one of the following properties set to t:
  • lxDummy
  • ignore
  • lvsIgnore
• The instance is not bound to the schematic. This behavior is controlled by a the modgenCreateUnboundAsDummies environment variable. The default value is t. In this state, the instance is considered a dummy. When set to nil, the instance is not considered a dummy.
• The instance gate net is the same as that assigned to the environment variable modgenDummyNet.

The Add Dummy button on the Modgen Placement toolbar provides the following options to add dummies at different locations:

• Add Dummy Left: Adds dummy devices to the left of the selected Modgen instances
  
  
• Add Dummy Right: Adds dummy devices to the right of the selected Modgen instances
  
  
• Add Dummy Top: Adds dummy devices above the selected Modgen instances
  
  
• Add Dummy Bottom: Adds dummy devices below the selected Modgen instances
  
  
• Surround Dummies: A ring of dummies is added around the selected Modgen instances.
  
  

You can use the Modgen Editor to add and delete dummies and dummy device rows and columns, add dummy devices to the array, and backannotate dummy devices.

Related Topics

Adding and Deleting Dummies in the Modgen Editor

Adding Surround Dummies

Adding Dummy Device Rows or Columns

Neighbor Dummy Type for Modgens

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