在分析数字电路传统设计理论中存在问题的基础上,提出了应用开关变量与信号变量两者来分别描写数字电路中内部元件的开关状态及电路信号,并由此出发建立了开关-信号理论.根据CMOS电路的工作原理,发展了与之相关的开关级设计技术.设计实例表明,由于在设计中以晶体管为构造单元,因此开关级设计的电路要较传统的门级设计具有较简单的结构。 Based on the analysis of the existing problems in the traditional design theory of digital circuits, it is proposed to use switch variables and signal variables to describe the switching states and circuit signals of the internal components in the digital circuits respectively. Based on this, the switch - signal theory is established. According to the working principle of CMOS circuits, the related switching level design techniques are developed.The design examples show that the circuit design of switching level has a simpler structure than the traditional gate level design because of the transistor in the design unit .