Optoelectronic devices based on configurable hysteresis of Schmitt trigger circuit control with the employment of CMOS technology

This study has clarified the optoelectronic devices based on configurable hysteresis of Schmitt trigger circuit control with the employment of CMOS technology. Schmitt trigger (ST) is an electronics circuit, widely used in a sensor network to detect a signal with low amplitude in a noisy environment. It converts a variable input signal to a constant output level. In contrast to the comparator, an ST offers two independent switching voltages with positive feedback that enhances the depth of the switching threshold. Hysteresis width is an inbuilt feature of the trigger circuit, removing the irregularities or noise near the threshold region and shaping it into smooth output. The hysteresis width can be adjusted by a suitable variation in the aspect ratio of input and feedback transistors. In this work, conventional ST architecture modifies by configuring the series and/or parallel connection of n-channel and p-channel MOS devices to adjust the hysteresis voltage. The simulation result is obtained with Cadence Spectra with BSIM3V3 device models at 90 nm CMOS technology, and hysteresis width falls by reducing the feedback ratio of the increase with feedback ratio.