Voltage-Controlled Square/Triangular Wave Generator with Current Conveyors and Switching Diodes

Martin Janecek, David Kubanek, Kamil Vrba

Abstract


A novel relaxation oscillator based on integrating the diode-switched currents and Schmitt trigger is presented. It is derived from a known circuit with operational amplifiers where these active elements were replaced by current conveyors. The circuit employs only grounded resistances and capacitance and is suitable for high frequency square and triangular signal generation. Its frequency can be linearly and accurately controlled by voltage that is applied to a high-impedance input. Computer simulation with a model of a manufactured conveyor prototype verifies theoretic assumptions.

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References


I. M. Filanovsky, Nonsaturated multivibrators for sensor signal conditioning, in Proceedings of the IEEE 32nd Midwest Symposium on Circuits and Systems, Vol. 36, pp. 1256–1257, 1989.

S. N. Nihtianov, G. P. Shterev, B. Iliev, G. C. M. Meijer, An interface circuit for R-C impedance sensors with a relaxation oscillator. IEEE Trans. Instrum. Meas., Vol. 50, No. 6, pp. 1563–1567, 2001.

M. T. Abuelma’atti, M. A. Al-Absi, A current conveyor-based relaxation oscillator as a versatile electronic interface for capacitive and resistive sensors. Int. J. Electron., Vol. 92, No. 8, pp. 473–477, 2005.

M. T. Abuelma’atti, M. A. Al-Absi, A low-cost dual/slope triangular/square wave generator. Int. J. Electron., Vol. 91, No. 3, pp. 185–190, 2004.

M. T. Abuelma’atti, S. M. Al-Shahrani, New CFOA-based triangular/square wave generator. Int. J. Electron., Vol. 84, No. 6, pp. 583–588, 1998.

B. Almashary, H. Alhokail, Current-mode triangular wave generator using CCIIs. Microelectron. J., Vol. 31, pp. 239–243, 2000.

W.-S. Chung, H. Kim, H.-W. Cha, H.-J. Kim, Triangular/squarewave generator with independently controllable frequency and amplitude. IEEE Trans. Instrum. Meas., Vol. 54, No. 1, pp. 105–109, 2005.

O. Cicekoglu, H. Kuntman, On the design of CCII+ based relaxation oscillator employing single passive element for linear period control. Microelectron. J., Vol. 29, pp. 983–989, 1998.

D. Pal, A. Srinivasulu, B.B. Pal, A. Demosthenous, B.N. Das, Current conveyor-based square/triangular wave generators with improved linearity. IEEE Trans. Instrum. Meas., Vol. 58, No. 7, pp. 2174–2180, 2009.

A. Srinivasulu, A novel current conveyor-based Schmitt trigger and its application as a relaxation oscillator. Int. J. Circuit Theory Appl., Vol. 39, No. 6, pp. 679–686, 2011.

S. Minaei, E. Yuce, A Simple Schmitt Trigger Circuit with Grounded Passive Elements and Its Application to Square/Triangular Wave Generator. Circuits, Systems, and Signal Processing, 22 November 2011, pp. 1–12, 2011.

D. Kubanek, K. Vrba, Two-function Filters Employing UCCX Element. In Proc. of the 27th Int. Conference Telecommunications And Signal Processing 2004. Brno, Czech Republic, 2004, pp. 107–110.

Datasheet: UCC-N1B Universal Current Conveyor (UCC) and Second-Generation Current Conveyor (CCII+/-), Rev. 0, 2011, available online:

www.utko.feec.vutbr.cz/~koton/soubory/UCC_N1B_Rev0.pdf

J. Misurec, J. Koton, Schmitt Trigger with Controllable Hysteresis Using Current Conveyors. International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, Vol. 1, No. 1, pp. 26-30, 2012. ISSN: 1805- 5443.




DOI: http://dx.doi.org/10.11601/ijates.v1i2-3.33

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