NONIDEAL BEHAVIOUR OF OA-BASED ASTABLE MULTIVIBRATORS WITH APPLICATIONS IN LINEAR CAPACITANCE- AND INDUCTANCE-TO-TIME CONVERSIONS
Romeo Ghinea, Liviu Goras, Tecla Goras, TUIASI, Iasi, Romania
Michael Ansorge, University of Neuchatel (UniNE), Neuchatel, Switzerland
DOI: 10.36724/2664-066X-2022-8-1-14-19
SYNCHROINFO JOURNAL. Volume 8, Number 1 (2022). P. 14-19.
Abstract
The nonideal behaviour of astable multivibrators based on Negative Impedance Converter (NIC) type configuration is approached taking into consideration several nonidealities among which the slew-rate of the voltage operational amplifier (OA). Linear conversion of inductances, capacitances and resistances into time period is useful to measure impedances or physical quantities by means of impedance-type transducers. Following a series of investigations on this topic, a thorough study of four configurations for linear inductance-time and capacitance-time conversions based on the astable multivibrator viewed as a NIC-type nonlinear oscillator. Four circuits were studied, two of them having grounded reactive elements. The results can be used for linear capacitance-to-time (C|T) and inductance-to-time (L|T) conversions.
Keywords: Negative Impedance Converter, operational amplifier, capacitance-to-time, inductance-to-time.
References
[1] L. Goraş, C. Mărcuţă, “Nonlinear Synthesis Using Saturation of the Operational Amplifier”, Bulletin of Polytechnic Inst. of Iaşi, Vol. XXVI(XXX), Fasc. 1-2, pp. 25-30, 1980.
[2] R. Senani, “A New Technique for Inductance-to-Time Period Conversion Using Integrated Operational Amplifiers”, IEEE Trans. on Industrial Electronics, Vol. IE-27, No. 1, pp. 36-37, Feb. 1980.
[3] L. Goraş, C. Mărcuţă, “Comment on A New Tech[1]nique for Inductance-to-Time Period Conversion Using Integrated Operational Amplifiers”, IEEE Trans. on Industrial Electronics, Vol. IE-32, No. 1, pp. 85, Feb. 1985.
[4] R. Senani, “On Linear Inductance-Time and Related Conversions Using IC Op Amps”, IEEE Trans. on Industrial Electronics, Vol. IE-34, No. 2, pp. 292-293, May 1987.
[5] L. Goraş, C. Mărcuţă, “On Linear Inductance and Capacitance Time Conversions Using NIC-Type Configurations”, IEEE Trans. on Industrial Electronics, Vol. 40, No. 5, pp. 529-531, Oct. 1993.
[6] L. Goraş, T. Goraş, V. Cehan, R. Ghinea, “On linear time-inductance conversion”, Proc. of 6-th Int’l. Symp. for Design and Technology for Electronic Modules, Bucharest, Romania, Sept. 2000, pp. 149 – 153.