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    • 7. 发明公开
    • Input stage with dynamic hysteresis
    • Eingangsstufe mit dynamischer滞后
    • EP1071215A1
    • 2001-01-24
    • EP99830457.0
    • 1999-07-19
    • STMicroelectronics S.r.l.
    • Fucili, Giona
    • H03K19/00H03K19/017
    • H03K19/01721H03K19/0027
    • A circuit for shifting the triggering threshold of a stage (MP1,MN1) having an input coupled to a circuital node (OUT), following the sensing of a switching phase of said node from a logic state to another and for the remaining duration of the switching phase, produces a hysteresis effectively greater than the maximum theoretical limit of hysteresis admitted by the triggering threshold of the stage (MP1,MN1) coupled to said circuital node. The circuit comprises at least two switches, a first switch (MP2) connected in an electric path between said circuital node (OUT) and a supply rail (Vdd) and the second switch (MN2) connected in an electric path between said circuital node (OUT) and ground; at least a generator (P1,P2) of a single pulse of duration equal or longer than the duration of the rise time and of the fall time of the voltage on said circuital node, and shorter than the minimum time of persistence at a certain logic state of said circuital node (OUT), having an input coupled to said circuital node (OUT) and generating said single pulse upon sensing a switching from a logic state to another of said circuital node. Means coupled to an output of said pulse generator and to the control nodes of said switches configure the switches (MP2,MN2) in a state such to maintain the new logic state assumed by said circuital node (OUT) for the duration of said single pulse.
    • 一种用于将具有耦合到电路节点(OUT)的输入的级(MP1,MN1)的触发阈值移位的电路,在将所述节点的切换阶段从逻辑状态检测到另一状态之后, 开关相位产生滞后有效地大于耦合到所述电路节点的级(MP1,MN1)的触发阈值允许的滞后的最大理论极限。 该电路包括至少两个开关,连接在所述电路节点(OUT)和电源轨(Vdd)之间的电气路径中的第一开关(MP2)和第二开关(MN2),该第二开关连接在所述电路节点 OUT)和地面; 至少一个持续时间等于或长于上升时间的持续时间的单个脉冲的发生器(P1,P2)和所述电路节点上的电压的下降时间,并且短于在某个逻辑处的持续时间的最小时间 所述电路节点(OUT)的状态具有耦合到所述电路节点(OUT)的输入并且在感测到从逻辑状态到所述电路节点的另一个的切换时产生所述单个脉冲。 耦合到所述脉冲发生器的输出和所述开关的控制节点的装置将开关(MP2,MN2)配置成在所述单个脉冲的持续时间期间保持由所述电路节点(OUT)假设的新的逻辑状态的状态 。