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New Concepts in Electric

MOST CAD SYSTEMS use two methods to do circuit design: connectivity and geometry.

ELECTRIC IS DIFFERENT because it uses connectivity for all design, even Integrated Circuit layout. This means that you place components (MOS transistors, contacts, etc.) and draw wires (metal-2, polysilicon, etc.) to connect them. The screen shows the true geometry, but it knows the connectivity too.

The advantages of connectivity-based IC layout are many:

The disadvantages of connectivity-based IC layout are also known: