System And Method For Constructing Waffle Transistors
AssigneeNeofocal Systems, Inc.
InventorTsutomu Shimomura
Life of this patent
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Abstract
Waffle transistors are used within an integrated circuit when a transistor must carry an amount of current greater than the amount of current carried by a typical transistor in the integrated circuit. In a waffle transistor a set of source areas and drain areas are arranged in a checkerboard pattern. The source areas must all be connected together and the drain areas must all be connected together. To efficiently connect the source (or drain) areas together, a serpentine metal interconnect pattern is used. The serpentine pattern reduces the amount of metal required outside of the array. The serpentine pattern may be improved with offset contacts in the source and drain areas that cause the serpentine metal interconnects to be straighter.
Claims21
A transistor circuit design for use in an integrated circuit, said transistor circuit design comprising:
- a grid array comprising rows and columns, said grid array comprising a set of source areas and a set of drain areas arranged in an alternating pattern;
- a first set of parallel serpentine metal interconnects formed in a first metal layer, said first set of parallel serpentine interconnects coupling together transistor source areas in adjacent rows of said grid array;
- and
- a second set of parallel serpentine metal interconnects formed in said first metal layer, said second set of parallel serpentine interconnects coupling together transistor drain areas in adjacent rows of said grid array.
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A transistor circuit design for use in an integrated circuit, said transistor circuit design comprising:
- a grid array comprising rows and columns, said grid array comprising a set of source areas and a set of drain areas arranged in an alternating pattern;
- a first set of parallel serpentine metal interconnects formed in a first metal layer, said first set of parallel serpentine interconnects coupling together contacts in said source areas in adjacent rows, said source contacts are offset from the center of said source areas;
- and
- a second set of parallel serpentine metal interconnects formed in said first metal layer, said second set of parallel serpentine interconnects coupling together contacts in said drain areas in adjacent rows, said drain contacts are offset from the center of said drain areas.
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Dependencies are inferred from the claim text.