3.
    发明专利
    未知

    公开(公告)号:DE2612667A1

    公开(公告)日:1976-10-28

    申请号:DE2612667

    申请日:1976-03-25

    Applicant: IBM

    Abstract: A process for forming complete dielectrically isolated monocrystalline silicon regions on a substrate by depositing a first epitaxial silicon layer embodying an N-type impurity on a low resistivity silicon substrate embodying a P-type impurity, forming annular P-type impurity regions in the first epitaxial layer, depositing the second epitaxial layer embodying an N-type impurity on the first epitaxial layer, forming annular P-type impurity regions in the second epitaxial layer in registry with the annular regions in the first epitaxial layer, converting the silicon substrate and the annular P-type regions in the first and second epitaxial layers into porous silicon material by an anodic treatment carried out in an aqueous solution of hydrofluoric acid, and oxidizing the porous silicon material to form silicon oxide.

    5.
    发明专利
    未知

    公开(公告)号:DE2364787A1

    公开(公告)日:1974-07-11

    申请号:DE2364787

    申请日:1973-12-27

    Applicant: IBM

    Abstract: In integrated semiconductor circuits comprising a plurality of active and passive devices interconnected by conductive means into a selected circuit configuration, the improvement wherein said circuit configuration is arranged so as to be free of possible paths displaying reactance which would be alternative to selected substantially reactanceless paths terminating in critical circuit nodes in the event of structural failure of one of said reactanceless paths, whereby the DC testing of the integrated circuit is not affected by such alternative paths.

    8.
    发明专利
    未知

    公开(公告)号:DE2258483A1

    公开(公告)日:1973-07-05

    申请号:DE2258483

    申请日:1972-11-29

    Applicant: IBM

    Abstract: A semiconductor integrated circuit masterslice comprising semiconductor substrate having a center of origin and arcuate or annular conductive lines thereon. A plurality of cell groups are symmetrically located on the semiconductor substrate with respect to radial lines extending from the center of origin so as to significantly increase packing densities compared to that available with orthongonally or randomly disposed monolithic integrated circuit structures.

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