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Method for fabricating IGFET integrated circuits

  • US 4,319,396 A
  • Filed: 12/28/1979
  • Issued: 03/16/1982
  • Est. Priority Date: 12/28/1979
  • Status: Expired due to Term
First Claim
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1. A method for fabricating a random-logic IGFET integrated circuit having a multiplicity of transistors in a prescribed arrangement, the method comprising the steps of:

  • (1) forming on a single substrate chip a multiplicity of gate insulator regions, each associated with a different one of the transistors and overlying a semiconductive bulk region, the gate insulator regions being disposed in respective positions in an array of intersecting rows and columns, the gate insulator regions being spaced apart, except that the gate insulator regions situated in adjacent rows within a column being adjoined to form merged gate insulator regions;

    (2) forming on the chip a plurality of spaced apart gate conductor paths, each positioned to lie along a respective one of the rows and to overlie the gate insulator regions in the respective one of the rows and serving as the gate electrode where crossing a gate insulator region;

    (3) forming source/drain regions in portions of the semiconductive bulk region underlying portions of the gate insulator regions not covered by a gate conductor path;

    (4) forming contact means to the source/drain regions; and

    (5) forming above the semiconductive bulk region a plurality of second conductor paths for interconnecting the contact means and extending generally orthogonally to the gate conductor paths.

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