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Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

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Abstract

This article presents the new current-mode counterclockwise (CCW) and clockwise (CW) Schmitt triggers based on multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA). The circuit descriptions are very simple, each construction consists of only single MO-CCCDTA, without any external passive element. The hysteresis and amplitude of the output current of each Schmitt trigger can be tuned independently/electronically by input bias currents. In addition, the output signals are independent of the thermal voltage (VT). The applications as a relaxation oscillator, triangular/square wave generator, pulse width modulation and monostable multivibrator are given here to display the usefulnesses of the presented Schmitt triggers. The PSpice simulation and experimental results are depicted, and agree well with the theoretical anticipation. The maximum power consumptions of CCW and CW Schmitt triggers are approximately 235 and 191 μW, respectively, at ±1.5 V supply voltages.

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Acknowledgment

This work was granted by the Commission on Higher Education granting Mr. Phamorn Silapan supported for the Strategic scholarships fellowship frontier research network from the Commission on Higher Education of Thailand.

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Authors and Affiliations

  1. Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok, Bangkok, 10800, Thailand

    Phamorn Silapan & Montree Siripruchyanun

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  1. Phamorn Silapan
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  2. Montree Siripruchyanun
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Correspondence to Montree Siripruchyanun.

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Silapan, P., Siripruchyanun, M. Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications. Analog Integr Circ Sig Process 68, 111–128 (2011). https://doi.org/10.1007/s10470-010-9593-2

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  • DOI: https://doi.org/10.1007/s10470-010-9593-2

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