3.
    发明专利
    未知

    公开(公告)号:DE69025854T2

    公开(公告)日:1996-08-01

    申请号:DE69025854

    申请日:1990-10-24

    Abstract: The manufacturing process comprises a first step of formation of an N type sink (2) on a single-crystal silicon substrate (1), a second step of formation of an active area (14) on the surface of said sink (2), a third step of implantation of N- dopant in a surface region (4) of the sink (2) inside said active area (14), a fourth step of growth of a layer (5) of gate oxide over said region with N- dopant, a fifth step of N+ implantation (6; 9) inside said N- region, a sixth step of P+ implantation (7; 12) in a laterally displaced position with respect to said N+ region and a seventh step of formation of external contacts (8, 18; 13, 23, 33) for said N+ and P+ regions. There is thus obtained a zener diode limiter, having a cut-off voltage which is stable over time and not much dependent on temperature and which does not require the addition of process steps with respect to those usually necessary for the accomplishment of EEPROM memory cells.

    5.
    发明专利
    未知

    公开(公告)号:IT1237666B

    公开(公告)日:1993-06-15

    申请号:IT2222889

    申请日:1989-10-31

    Abstract: The manufacturing process comprises a first step of formation of an N type sink (2) on a single-crystal silicon substrate (1), a second step of formation of an active area (14) on the surface of said sink (2), a third step of implantation of N- dopant in a surface region (4) of the sink (2) inside said active area (14), a fourth step of growth of a layer (5) of gate oxide over said region with N- dopant, a fifth step of N+ implantation (6; 9) inside said N- region, a sixth step of P+ implantation (7; 12) in a laterally displaced position with respect to said N+ region and a seventh step of formation of external contacts (8, 18; 13, 23, 33) for said N+ and P+ regions. There is thus obtained a zener diode limiter, having a cut-off voltage which is stable over time and not much dependent on temperature and which does not require the addition of process steps with respect to those usually necessary for the accomplishment of EEPROM memory cells.

    7.
    发明专利
    未知

    公开(公告)号:DE69025854D1

    公开(公告)日:1996-04-18

    申请号:DE69025854

    申请日:1990-10-24

    Abstract: The manufacturing process comprises a first step of formation of an N type sink (2) on a single-crystal silicon substrate (1), a second step of formation of an active area (14) on the surface of said sink (2), a third step of implantation of N- dopant in a surface region (4) of the sink (2) inside said active area (14), a fourth step of growth of a layer (5) of gate oxide over said region with N- dopant, a fifth step of N+ implantation (6; 9) inside said N- region, a sixth step of P+ implantation (7; 12) in a laterally displaced position with respect to said N+ region and a seventh step of formation of external contacts (8, 18; 13, 23, 33) for said N+ and P+ regions. There is thus obtained a zener diode limiter, having a cut-off voltage which is stable over time and not much dependent on temperature and which does not require the addition of process steps with respect to those usually necessary for the accomplishment of EEPROM memory cells.

    8.
    发明专利
    未知

    公开(公告)号:IT8922228D0

    公开(公告)日:1989-10-31

    申请号:IT2222889

    申请日:1989-10-31

    Abstract: The manufacturing process comprises a first step of formation of an N type sink (2) on a single-crystal silicon substrate (1), a second step of formation of an active area (14) on the surface of said sink (2), a third step of implantation of N- dopant in a surface region (4) of the sink (2) inside said active area (14), a fourth step of growth of a layer (5) of gate oxide over said region with N- dopant, a fifth step of N+ implantation (6; 9) inside said N- region, a sixth step of P+ implantation (7; 12) in a laterally displaced position with respect to said N+ region and a seventh step of formation of external contacts (8, 18; 13, 23, 33) for said N+ and P+ regions. There is thus obtained a zener diode limiter, having a cut-off voltage which is stable over time and not much dependent on temperature and which does not require the addition of process steps with respect to those usually necessary for the accomplishment of EEPROM memory cells.

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