公开(公告)号：US6147517A

公开(公告)日：2000-11-14

申请号：US162675

申请日：1998-09-29

申请人： Bassem M. AlNahas ,  Alex Gusinov ,  Jeffrey B. Van Auken

发明人： Bassem M. AlNahas ,  Alex Gusinov ,  Jeffrey B. Van Auken

IPC分类号： H03K3/356 ,  H03K17/693 ,  H03K5/22

CPC分类号： H03K17/693 ,  H03K3/356113

摘要： Control circuit for providing the greater of a supply voltage V.sub.CC and a battery voltage V.sub.BATT. A comparator compares V.sub.CC and V.sub.BATT, and provides output signals to an inverting gain stage. A switch receives output signals from the inverting gain stage and provides the greater of V.sub.CC and V.sub.BATT as the circuit output and as the comparator supply voltage. The circuit output voltage rapidly switches between V.sub.CC and V.sub.BATT as the comparison status of the two voltages changes.

摘要翻译： 用于提供更大的电源电压VCC和电池电压VBATT的控制电路。 比较器比较VCC和VBATT，并向反相增益级提供输出信号。 开关从反相增益级接收输出信号，并提供VCC和VBATT中较大的电路作为电路输出和比较器电源电压。 当两个电压的比较状态发生变化时，电路输出电压在VCC和VBATT之间快速切换。