Abstract
New solutions of inverter, NAND and NOR logic circuits with hysteresis transfer characteristic (Schmitt triggers) consisting of three standard CMOS logic circuits and one resistor are described in this paper. The input circuit determines the logic function of a Schmitt trigger and the other two are connected in an inverter configuration. Through resistor R and the inverters, the positive feedback loop is closed during the change of output state. Besides the theoretical analysis of transfer function and conditions of existence of hysteresis, experimental results are given in the paper.
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