The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The DC photoconductivity of powdered silicon samples was studied. Effective sensitization of photoconductivity for semiconductors with organic dyes applied to the surface of microcrystalls was found. Photoconductivity in the absorption band of the dyes in the visible part of the spectrum is increasing by more than an order of magnitude.
Results of research of influence of a Normalizer voltage on characteristics and the modes of a distributive electric network are presented: on static characteristics of active and inductive, resistive-capacitive and motor loading, on limit of the transferred power on a power line under the terms of stability at longitudinal and cross inclusion of a Normalizer voltage. Pilot studies are executed on...
The article considers the advanced two-stage architectures of the differential op-amps and differential difference operational amplifiers, realized on the base BiJFet of array chips AGAMC1.3, AGAMC2.1 (OJSC “Integral”, Minsk). The suggested circuits provide the higher voltage gain (more than 90…100 dB), and also the low offset voltage (less than 100 µV) over the temperature range −80°C – +80°C, the...
It is shown that when using modulate-present additional signal at the input of the analog-to-digital Converter subsequent filtration, it is possible to improve the accuracy of the ADC. Given the theoretically cal justification of the method and carried out the computer modeling.
A MMIC double-balanced passive mixer with on-chip integrated baluns based on 0.25 µm SiGe BiCMOS technology is presented. The mixer core configuration uses ring-connected CMOS transistors. The main MMIC mixer design steps are considered. The construction of integrated on-chip broadside balun is investigated. The MMIC mixer in the test bench with wire bonding has the following characteristics: conversion...
The mathematical description of the method of changes the wavelength of the laser radiation 670 nm and 850 nm is formed. Mathematical calculations prove the new method of laser stimulation of biologically active points of a living organism. Effect on biological point happens from is moving the laser source by the variable speed. The study allows to calculate the dependence of the wavelength on the...
Analysis of the capacitance distribution over the cross-section of the micro-strip line is considered. The calculations were carried out using a finite element method after conformal mapping of the considered area. The results obtained allow calculating the capacitance in the cross-section of the unit length micro-strip line (discrete) on the top and bottom surfaces and edges of the micro-strip line.
The results of NI LabVIEW digital modeling of application of the α-trimmed mean to suppress industrial interferences in the process of analog-to-digital conversion are presented. The stability of the ADC bit-for-bit encoding with different weighting factors (binary, Fibonacci codes) to periodical interference, impulse interference and normal noise is estimated. It is established that the drop 5–15%...
The influence of a dielectric constant of the zinc tungstate on the return loss of printed dipole is presented. The return loss indicates how the printed dipole is matched with the energized coaxial cable having the characteristic impedance 50 Ohms. The dielectric constant of zinc tungstate is the random quantity with the Gaussian distribution having the nominal value equal to 18. Plots of the return...
Single-fiber optical transmission system (SFOTS) is offered, where the duplex is organized using dense wavelength division multiplexing (DWDM). The process of generating four-wave mixing products (FWM) occurring in optical fiber is modeled. The distribution of FWM products for the optical spectrum is investigated, as well as the number of products falling within the channel bandwidth.
For research students of different variants of broadcasting networks in the department of radio systems and signal processing SUT established laboratory model created broadcasting network section comprising two main stations, antenna user terminal, and an optical amplifier equipment, connecting cables. The layout allows you to construct network broadcasting in various configurations, from four types...
Using monocrystalline silicon carbide polytype 6H developed and tested design pyrometric probe, which increases the degree considered horizontally isothermal surface emitting area, through the creation of static heterogeneity. In the temperature range 800…1300°C experimental methods television pyrometry, including both full and partial immersion of the probe in the gas flame, the peculiarities of...
In this article, we consider the numerical analysis of the influence of the self-heating effect on the parameters of the complementary vertical bipolar transistors fabricated in bipolar technology classic with the p-epitaxy. As a result of investigations, it was determined that for such structures, the effect of self-heating is negligible and therefore it cannot be taken into account when designing...
The authors have observed some directions of development underground information technologies implemented in Granch Ltd. These directions related to providing safety of operations in mining. The results of experiments have been shown.
An excitation of magnetostatic surface waves (MSSW) by symmetric coplanar transmission line was considered for the case, when coplanar line is placed at some distance from the ferrite film surface. The dependence of coplanar line impedance on the spacing between the line and ferrite film has been studied for design of band-stop filter. Approximate theoretical method of band-stop filter design is presented...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.