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CMOS Schmitt trigger circuit

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TLDR
In this article, a CMOS Schmitt trigger which has two series-connected inverters uses both an input and an output signal to provide hysteresis, and a pair of series-coupled transistors is coupled between a power supply terminal and a node between the two inverters.
Abstract
A CMOS Schmitt trigger which has two series-connected inverters uses both an input and an output signal to provide hysteresis. A pair of series-coupled transistors is coupled between a power supply terminal and a node between the two inverters. One of the transistors has a control electrode for receiving the input signal. The other of the transistors has a control electrode for receiving the output signal.

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Citations
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References
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Patent

Cmos schmitt-trigger circuit

TL;DR: A CMOS Schmitt-trigger circuit for shaping the wave form of an input signal to be applied to logic circuits, such as flip-flops, counters, etc., was proposed in this paper.