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MOS transistor that inhibits punchthrough

  • US 6,489,651 B1
  • Filed: 06/16/2000
  • Issued: 12/03/2002
  • Est. Priority Date: 12/30/1997
  • Status: Expired due to Term
First Claim
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1. A MOS transistor having a semiconductor substrate, comprising:

  • a transistor area defined by a first isolation area formed in the semiconductor substrate, the semiconductor substrate having an upper surface;

    a gate oxide layer formed over the transistor area;

    a gate conductor formed over the gate oxide layer, wherein the gate conductor defines a channel region;

    a source and a drain; and

    a second isolator formed in the substrate between the source and the drain and below the upper surface of the semiconductor substrate, the gate oxide layer and the gate conductor;

    wherein the second isolator does not extend to the upper surface of the semiconductor substrate.

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