中文摘要：

介绍了3种开关消抖方案的工作原理，给出了基于VHDL的相关实现程序和测试结果，并就结构、抗干扰、时序配合等方面对电路性能进行分析讨论。电路实用性强，对学生设计电路有一定的启发引导。

英文摘要：

The working principle of three kinds of schemes for dithering elimination of switch is introduced. Related procedures on VHDL and testing results are given. The circuit performances about structure, anti-interference, sequential cooperation, etc. are analyzed and discussed. The proposed circuits have high practicability and consequently can enlighten students on circuit design.