逻辑电平，是指一种可以产生信号的状态，通常由信号与地线之间的电位差来体现。逻辑电平的浮动范围由逻辑家族中不同器件的特性所决定。

In digital circuits, a logic level is one of a finite number of states that a digital signal can have. Logic levels are usually represented by the voltage difference between the signal and ground, although other standards exist. The range of voltage levels that represents each state depends on the logic family being used.