THE SEQUENTIAL CHARACTERISTIC OF SCHMITT CIRCUIT AND ITS DESIGN AT GATE LEVEL
施密特电路的时序特征及门级设计

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 sequen-tial characteristic as flip-flops which are used as memory units. With the design procedure of sequential circuits, varieties of Schmitt circuits based on integrated gate circuits are systemati-cally investigated, and some new designs are found. PSPICE simulations prove that the circuits designed in this paper have ideal characteristic of Schmitt circuits.