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 Âolshevistskaya 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