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    • 38. 发明授权
    • ESD protection circuit and method
    • ESD保护电路及方法
    • US07672101B2
    • 2010-03-02
    • US11852799
    • 2007-09-10
    • Shu-Huei LinChong-Gim GanYi-Hsun WuYu-Chang Lin
    • Shu-Huei LinChong-Gim GanYi-Hsun WuYu-Chang Lin
    • H02H9/00
    • H01L27/0266
    • A system includes a driving device operating at first supply voltage Vdd1 and having a CMOS output. A driven devise operates at a second supply voltage Vdd2 lower than the first supply voltage Vdd1, and has a CMOS input with an NMOS pull-down transistor. A protection circuit includes a first resistor coupled to the CMOS output of the driving device and a gate of the NMOS pull-down transistor. A parasitic NPN bipolar junction transistor has a drain connected to the gate of the NMOS pull-down transistor sad a source coupled to a lower-voltage supply rail VSS. A second resistor connects a gate of the parasitic NPN bipolar junction transistor to Vss. The second resistor has a resistance sized for controlling a trigger voltage of the parasitic NPN bipolar junction transistor for protecting a gate oxide layer of the NMOS pull-down transistor from an electrostatic discharge.
    • 系统包括以第一电源电压Vdd1操作并具有CMOS输出的驱动装置。 驱动装置在低于第一电源电压Vdd1的第二电源电压Vdd2下工作,并具有带NMOS下拉晶体管的CMOS输入。 保护电路包括耦合到驱动装置的CMOS输出的第一电阻器和NMOS下拉晶体管的栅极。 寄生NPN双极结晶体管具有连接到NMOS下拉晶体管的栅极的漏极和耦合到较低电压电源轨VSS的源极。 第二个电阻将寄生NPN双极结晶体管的栅极连接到Vss。 第二电阻器的电阻大小用于控制寄生NPN双极结晶体管的触发电压,用于保护NMOS下拉晶体管的栅氧化层免受静电放电。