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热词
    • 10. 发明授权
    • Reduced latchup in precharging I/O lines to sense amp signal levels
    • 在预充电I / O线路中减少闭锁以感测放大器信号电平
    • US4962326A
    • 1990-10-09
    • US222842
    • 1988-07-22
    • Ward D. ParkinsonWen-Foo Chern
    • Ward D. ParkinsonWen-Foo Chern
    • G11C7/10H03K19/003
    • G11C7/1048H03K19/00315
    • I/O lines on a CMOS circuit are precharged to preferred voltage levels in order to avoid latch up. The precharging is achieved by using N channel transistors to provide a precharge which is at a threshold voltage (V.sub.T) below bias voltage V.sub.CC, or (V.sub.CC -V.sub.T). This results in a lower forward bias when V.sub.CC bumps down after the I/O lines are floated. By lowering the precharge voltage by a level corresponding to a threshold voltage (V.sub.T), the allowed range of power supply voltage bumping is increased by this amount. This eliminmates the destructive effect of a negative bump of V.sub.BE, which would have presented a diode forward bias condition. Instead, the power supply may bump to (V.sub.BE +V.sub.T).
    • CMOS电路上的I / O线被预先充电至优选的电压电平,以避免闩锁。 通过使用N沟道晶体管来提供预充电,该预充电的阈值电压(VT)低于偏置电压VCC或(VCC-VT)。 这导致当I / O线浮起后VCC下降时,较低的正向偏置。 通过将预充电电压降低到与阈值电压(VT)相对应的电平,电源电压触发的允许范围增加该量。 这消除了VBE的负凸起的破坏性影响,其将呈现二极管正向偏置条件。 相反,电源可能会碰到(VBE + VT)。