施密特设计CMOS Schmitt Trigger―A Uniquely Versatile Design ComponentCMOS Schmitt Trigger―A Uniquely Versatile Design ComponentINTRODUCTION 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……
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