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    • 3. 发明授权
    • Distributed silicon controlled rectifiers for ESD protection
    • 用于ESD保护的分布式可控硅整流器
    • US5532896A
    • 1996-07-02
    • US234882
    • 1994-04-26
    • Eugene CoussensThomas Dungan
    • Eugene CoussensThomas Dungan
    • H02H9/04
    • H02H9/046
    • An electrostatic discharge (ESD) protection circuit for integrated circuitry having a switching ground bus for isolating switching noise includes an ESD protection bus. A first transistor pair includes a PNP transistor and an NPN transistor, with each of the transistors having an emitter connected to a signal input/output pad. A second transistor pair has a PNP transistor and an NPN transistor having emitters connected to the switching ground bus. For each of the PNP transistors, the base is connected to the ESD protection bus and the collector is connected to a "clean" ground bus. For each of the NPN transistors, a base is connected to the clean ground bus and a collector is connected to the ESD protection bus. In this configuration, the PNP of one transistor pair and the NPN of the other transistor pair are able to operate as a distributed silicon controlled rectifier to protect a drive transistor during an ESD event. Optionally, a switching V.sub.DD bus may also be incorporated and a third transistor pair having emitters coupled to the switching V.sub.DD bus may be employed.
    • 具有用于隔离开关噪声的开关接地总线的集成电路的静电放电(ESD)保护电路包括ESD保护总线。 第一晶体管对包括PNP晶体管和NPN晶体管,其中每个晶体管具有连接到信号输入/输出焊盘的发射极。 第二晶体管对具有PNP晶体管和NPN晶体管,其具有连接到开关接地总线的发射极。 对于每个PNP晶体管,基极连接到ESD保护总线,并且集电极连接到“干净”的接地总线。 对于每个NPN晶体管,基极连接到干净的接地总线,并且集电极连接到ESD保护总线。 在这种配置中,一个晶体管对的PNP和另一个晶体管对的NPN能够作为分布式可控硅整流器工作,以在ESD事件期间保护驱动晶体管。 可选地,还可以并入开关VDD总线,并且可以采用具有耦合到开关VDD总线的发射极的第三晶体管对。