公开(公告)号：US4740717A

公开(公告)日：1988-04-26

申请号：US934753

申请日：1986-11-25

申请人： Thomas D. Fletcher ,  Yong-In Shin

发明人： Thomas D. Fletcher ,  Yong-In Shin

IPC分类号： H03K3/353 ,  H03K3/3565 ,  H03K17/30 ,  H03K17/687 ,  H03K19/003 ,  H03K17/16 ,  H03K19/094

CPC分类号： H03K3/3565 ,  H03K19/00361

摘要： A switching device (22) responsive to an input voltage V.sub.A is powered by low and high internal supply voltages V.sub.L and V.sub.H. The device changes state as V.sub.A -V.sub.L passes a threshold voltage V.sub.T. After the device makes a desired change of state in response to rising V.sub.A, a hysteresis circuit (24) temporarily decreases V.sub.T below that which would otherwise be present. Likewise, after the device makes a desired change of state in the opposite direction when V.sub.A is falling, the hysteresis circuit temporarily decreases V.sub.T. In both cases, V.sub.T later automatically returns to its original value. This dynamic hysteresis prevents spikes in V.sub.L and V.sub.H from causing undesired changes in state.

摘要翻译： 响应于输入电压VA的开关装置（22）由低和高内部电源电压VL和VH供电。 当VA-VL通过阈值电压VT时，器件改变状态。 在器件响应于升高的VA之后进行期望的状态改变时，滞后电路（24）暂时将VT降低到低于否则将存在的VT。 同样地，当VA在下降时，在相反方向进行期望的状态改变之后，滞后电路暂时降低VT。 在这两种情况下，VT稍后自动返回到其原始值。 该动态滞后可防止VL和VH中的尖峰引起不期望的状态变化。

公开(公告)号：US4777391A

公开(公告)日：1988-10-11

申请号：US75492

申请日：1987-07-17

申请人： Yong-In Shin

发明人： Yong-In Shin

IPC分类号： H03K19/0175 ,  H03K5/151 ,  H03K17/00 ,  H03K17/0412 ,  H03K17/62 ,  H03K19/003 ,  H03K19/088 ,  H03K19/013

CPC分类号： H03K5/151 ,  H03K17/04126 ,  H03K17/6257 ,  H03K19/00353

摘要： A select buffer circuit includes a first inverter circuit, a second inverter circuit connected to the first, and a circuit for charging and discharging the base of an inverter transistor in the second inverter circuit from a node in the first inverter circuit. The charging and discharging circuit includes a Schottky diode connected to the inverter transistor, a Schottky transistor connected in series with the diode, and a resistor for coupling the base of the Schottky transistor to the node in the first inverter circuit. A bipolar multiplexer including the select buffer circuit offers the advantage of an improved output waveform.