A novel electronically controlled Schmitt trigger with clockwise and anticlockwise hystereses

摘要

A novel circuit of Schmitt trigger employing a prototype of dual-X current conveyor transconductance amplifier and one grounded resistor is proposed in this paper. The main focus of the paper is towards the practicality of the proposed Schmitt trigger using the prototype of DXCCTA which is realized using commercially available ICs. The proposed circuit is easily cascadable. Both clockwise and anticlockwise hystereses are achievable simultaneously from the proposed circuit. The threshold levels and amplitudes of output currents are independently and electronically controllable. The non-ideal and parasitic studies of the proposed Schmitt trigger are investigated. Moreover, the application of Schmitt trigger as zero crossing detector is explored which enriches the applicability of the proposed circuit. Experimental results are depicted to verify the proposed Schmitt trigger circuit. Measured results show the good tuning of amplitude of output current for a wide range of 50 mu A to 1.5 mA.