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    • 3. 发明授权
    • Electrostatic discharge protective circuit formed by use of a silicon
controlled rectifier
    • 使用可控硅整流器形成的静电放电保护电路
    • US6072677A
    • 2000-06-06
    • US184897
    • 1998-11-03
    • Mainn-Gwo ChenMing-Jer ChenChuan H. Liu
    • Mainn-Gwo ChenMing-Jer ChenChuan H. Liu
    • H01L27/02H02H9/04
    • H01L27/0259H01L27/0251
    • An electrostatic discharge protective circuit formed by use of a silicon controller rectifier is coupled to an input port and an internal circuit for discharging electrostatic charges on the input port to ground. When the electrostatic charges are applied on the input port, a punch-through effect is created between a first P-type diffusion region and a second N-type diffusion region to turn on a parasitic NPN bipolar junction transistor. At the same time, a voltage is applied on a gate of the MOS transistor via a small-signal equivalent capacitor to turn on itself, thereby discharging the electrostatic charges. Accordingly, the trigger voltage of the silicon controller rectifier can be efficiently lowered to improve the electrostatic discharge protective capability of the silicon control rectifier.
    • 通过使用硅控制器整流器形成的静电放电保护电路耦合到输入端口和内部电路,用于将输入端口上的静电电荷排放到地。 当静电电荷施加到输入端口时,在第一P型扩散区域和第二N型扩散区域之间产生穿透效应,以接通寄生NPN双极结型晶体管。 同时,通过小信号等效电容器在MOS晶体管的栅极上施加电压以使其自身导通,从而放电静电电荷。 因此,可以有效地降低硅控制整流器的触发电压,以提高硅控整流器的静电放电保护能力。