施密特设计CMOS Schmitt Trigger―A Uniquely Versatile Design Component CMOS Schmitt Trigger―A Uniquely Versatile Design Component INTRODUCTION The Schmitt trigger has found many applications in numerous circuits, both analog and digital. The versatility of a TTL Schmitt is hampered by its narrow supply range, limited interface capability, low input impedance and unbalanced output characteristics. The Schmitt trigger could be built from discrete devices to satisfy a particular parameter, but this is a careful and sometimes time-consuming design. The CMOS Schmitt trigger, which comes six to a package, uses CMOS characteristics to optimize design and advance into areas where TTL could not go. These areas include: interfacing with op amps and transmission lines, which operate from large split supplies, l……