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Top-drain trench based resurf DMOS transistor structure

  • US 5,640,034 A
  • Filed: 05/18/1992
  • Issued: 06/17/1997
  • Est. Priority Date: 05/18/1992
  • Status: Expired due to Term
First Claim
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1. A high voltage power transistor, comprising:

  • a source formed at a top surface of the transistor;

    a drain formed at the top surface of the transistor;

    a gate formed in a trench between the source and drain; and

    a nonuniform dielectric lining in the trench having a thin portion adjacent the source and a thick portion adjacent the drain.

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