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低电平
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'''应用于工程技术领域的概念'''
*中文名:[[低电平]]
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*外文名:Vil
==上升沿==
数字电路中，把电压的高低用逻辑电平来表示。逻辑电平包括高电平和低电平这两种。不同的元器件形成的数字电路，电压对应的逻辑电平也不同。在TTL门电路中，把大于3.5伏的电压规定为逻辑高电平，用数字1表示；把电压小于0.3伏的电压规定为逻辑低电平，用数字0表示。数字电平从低电平（数字“0”）变为高电平（数字“1”）的那一瞬间（时刻）叫作上升沿 <ref>[[惠斌. 一种高速高压半桥驱动电路的分析与设计[(D]). 西北大学, 2010.]]</ref> 。
==下降沿==