A Schmitt Trigger Independently/Electronically Controllable Upper and Lower Threshold Currents

This article presents a current-mode Schmitt trigger circuit using commercial ICs and NOT gates. This circuit can be electronically controlled and operated independently to adjust the output amplitude and the threshold current in the upper and lower levels. Performance testing of the proposed circuit through PSpice simulations reveals that the output amplitude upper and lower threshold currents can be controlled effectively using external bias currents, corresponding to the theoretical analysis. Additionally, the presented circuit illustrates stability to external variations in temperature.