Power FET having reduced threshold voltage
    2.
    发明授权
    Power FET having reduced threshold voltage 失效
    功率FET具有降低的阈值电压

    公开(公告)号:US5218220A

    公开(公告)日:1993-06-08

    申请号:US789901

    申请日:1991-11-12

    摘要: In a power FET composed of a substrate having upper and lower surfaces and having a semiconductor body of a first conductivity type, the body providing a current flow path between the upper and lower surfaces and having at least one body region which extends to said upper surface; and at least one base region extending into the substrate from the upper surface, the base region being of a second conductivity type opposite to the first conductivity type and having an upper portion located adjacent the upper surface of the substrate and a lower portion separated from the upper surface of the substrate by the upper portion, the upper portion defining a channel which is disposed in the current flow path adjacent the upper surface of the substrate, and the FET further having an insulated gate disposed at the upper surface above the body region, an impurity layer region extends into the channel from the upper surface of the substrate for giving the channel a lower impurity density than the lower portion of the base region.

    摘要翻译: 在由具有上表面和下表面并且具有第一导电类型的半导体本体的基板组成的功率FET中,主体在上表面和下表面之间提供电流流动通道,并且具有延伸到所述上表面的至少一个主体区域 ; 以及从上表面延伸到基板中的至少一个基极区域,所述基极区域具有与第一导电类型相反的第二导电类型,并且具有邻近基板上表面的上部分, 所述上部设置在与所述基板的上表面相邻的所述电流流路中的通道,所述FET还具有设置在所述主体区域上方的上表面的绝缘栅, 杂质层区域从衬底的上表面延伸到沟道中,以使沟道的杂质密度低于基区的下部。

    Power MOSFET transistor circuit with active clamp
    4.
    发明授权
    Power MOSFET transistor circuit with active clamp 失效
    功率MOSFET晶体管电路与有源钳位

    公开(公告)号:US5079608A

    公开(公告)日:1992-01-07

    申请号:US609685

    申请日:1990-11-06

    摘要: A power MOS transistor, including source, drain, and gate electrodes, comprises a substrate of a semiconductor material of one conductivity type having first and second opposed surfaces; a drain region extending through the substrate between the surfaces; a plurality of spaced body regions of the opposite conductivity type extending into the substrate from the first surface; and a source region of the one conductivity type extending into the substrate from the first surface within each of the body regions, the interface of each of the source regions with its respective body region at the first surface being spaced from the interface of its respective body region and the drain region at the first surface to form a channel region therebetween. A gate electrode overlies and is insulated from the first surface and extends across the channel regions. A conductive electrode extends over and is insulated from the gate electrode, and contacts at least a portion of the source regions. A current limiting circuit is coupled between the conductive electrode and the gate electrode and a voltage limiting circuit is coupled between the drain electrode and the gate electrode.