"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 8, 2018

contents of issue      DOI  10.30898/1684-1719.2018.8.15     full text in Russian (pdf)  

Influence of current carrier recombination kinetics on nonlinear distortions coefficient of amplitude modulator based on photoresistant optron

B. N. Denisov, Ya. A. Zazulin, A. N. Shelkunov, D. V. Pyanzin

National Research Ogarev Mordovian State university, 68 olshevistskaya street, Saransk 430005, Russia

 

The paper is received on August 20, 2018

 

Abstract. The article describes the mixers of electrical signals that realize multiplication based on the photoresistor optocoupler. The results of the study of nonlinear distortion in the devices described above, related to the nonlinear kinetics of the photoresistor, are presented. To increase the accuracy of the measurements, a notation was proposed in the dimensionless quantities of the differential equation of the kinetics of carrier recombination, which makes it possible to simplify the use of the results of experimental studies. The ratio of the concentration of free carriers in the absence of excitation by light to the concentration of free carriers upon excitation is chosen as the dimensionless concentration. The high accuracy of the experimental measurement of this value made it possible to improve the accuracy of the calculated and measured values. The paper presents the results of calculations of experimental studies of the kinetics of recombination of free charge carriers and nonlinear distortions of a photoresistor made on the basis of high-resistance silicon. Relations are obtained for engineering calculations of the coefficient of nonlinear distortions of photoresistors with quadratic recombination. A method for eliminating nonlinear distortions of a modulating signal in an amplitude modulator based on a photoresistor optocoupler is proposed. The possibility of creating a balanced modulator based on a photoresistor optocoupler is shown, in which there are no nonlinear distortions of the signal carrying the information. Experimental data of calculations and oscillograms of signals with amplitude and balanced modulation are presented.

Keywords: amplitude modulator, photoconduction, photoresistant optron, kinetics of photoconduction, coefficient of nonlinear distortions, balanced modulator.

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For citation:
B. N. Denisov, Ya. A. Zazulin, A. N. Shelkunov, D. V. Pyanzin. Influence of current carrier recombination kinetics on nonlinear distortions coefficient of amplitude modulator based on photoresistant optron. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 8. Available at http://jre.cplire.ru/jre/aug18/15/text.pdf

DOI  10.30898/1684-1719.2018.8.15