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Island matrixed gallium nitride microwave and power switching transistors

  • US 9,064,947 B2
  • Filed: 08/04/2010
  • Issued: 06/23/2015
  • Est. Priority Date: 08/04/2009
  • Status: Active Grant
First Claim
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1. A nitride semiconductor device comprising:

  • a) a substrate;

    b) a nitride semiconductor layer comprising a nitride semiconductor hetero-layer formed on a main surface of the substrate;

    c) a plurality of source island electrodes and a plurality of drain island electrodes of a multi-island transistor formed on the nitride semiconductor layer, the source island electrodes and drain island electrodes being spaced apart from each other and arranged with alternating source island electrodes and drain island electrodes along at least two different axial directions to produce two-dimensional active regions in a device area of the nitride semiconductor layer, with;

    i) at least one side of each of the source island electrodes opposite a side of an adjacent drain island electrode;

    ii) at least one side of each of the drain island electrodes opposite a side of an adjacent source island electrode;

    d) a plurality of gate electrodes formed on the nitride semiconductor layer in active regions between each of the source island electrodes and each of the drain island electrodes, an overlying low resistance gate interconnect running between the source island electrodes and drain island electrodes, the plurality of gate electrodes being interconnected to the low resistance gate interconnect by interconnections at interstices defined by adjacent vertices of the source island electrodes and the drain island electrodes;

    ande) each of the plurality of source island electrodes having a respective individual source contact area (pad) comprising a bump or ball connection formed thereon;

    f) each of the plurality of drain island electrodes having a respective individual drain contact area (pad) comprising a bump or ball connection formed thereon;

    andg) the low resistance gate interconnect being connected to a plurality of gate pads.

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