基于时序特征的CMOS施密特电路开关级设计

Design of CMOS Schmitt Circuits at Switch Level Based on Their Sequential Characteristic

根据施密特电路对输入信号具有二种检测阈值的工作特点 ,提出了施密特电路与用作存贮元件的触发器之间具有相同的时序特征。利用时序电路的设计方法 ,系统地研究了传统的 CMOS施密特电路的各种设计 ,并发现了一些新的设计方案。

Based on the working characteristic of Schmitt circuits which have two detection thresholds to input signals, this paper proposes that Schmitt circuits have the same sequential characteristic as flip flops which are used as memory units. With the design procedure of sequential circuits, varieties of designs of the traditional CMOS Schmitt circuits are systematically investigated, and some new designs are found. PSPICE simulations prove that the circuits designed in this paper have ideal characteristic of Schmitt circuits.