Елементи теорії та прилади твердотілої електроніки. – 2002. – №458

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/42439

Вісник Національного університету «Львівська політехніка»

У Віснику опубліковано результати науково-дослідних робіт професорсько-викладацького складу, аспірантів та докторантів електрофізичного факультету Національного університету “Львівська політехніка”, науковців та викладачів із провідних вищих закладів освіти та академічних інститутів. У Віснику публікуються роботи провідних вчених Республіки Польща та Словаччини. Тематика робіт пов’язана з питаннями теорії фізики напівпровідників та напівпровідникових приладів, теоретичними і практичними проблемами мікроелектроніки та сенсорної техніки. Для викладачів, наукових співробітників, аспірантів, інженерів, студентів.

Вісник Національного університету "Львівська політехніка" : [збірник наукових праць] / Міністерство освіти і науки України, Національний університет "Львівська політехніка. – Львів : Видавництво Національного університету «Львівська політехніка», 2002. – № 458 : Елементи теорії та прилади твердотілої електроніки / відповідальний редактор Я. С. Буджак. – 291 с. : іл.

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A study of the feasibility of using low cost thick film tracks in the lower part of the microwave spectrum
(Видавництво Національного університету "Львівська політехніка", 2002) Jakubowska, Małgorzata; Pitt, Keith; ITME Institute of Electronic Materials Techology, Warsaw, Poland; Middlesex University, London, UK
Conventionally it is accepted that conductors for low microwave applications should meet a range of electrical and topographic criteria in order to perform correctly. These include a minimum thickness due to skin effects, smooth track and substrate surfaces and rectilinear geometry. The metal must also be very dense and uniform and have the highest possible electrical conductivity. As a result, photolithographically defined gold tracks are preferred and may be made in either thick or thin film.
About the nature of the main parameters of temperature sensors
(Видавництво Національного університету «Львівська політехніка», 2002) Budjak, Jaroslav; Hotra, Oleksandra; Lviv Polytechnic National University; Lviv State Medical University
The results of study of the nature of sensor materials properties are given in this paper. For study of the nature of conductivity and other kinetic properties of semiconductor materials modern kinetic theory was used. The theory is based on statistical sum of large nonequilibrium ensemble of charge carrier gas particles in semiconductors.
Analysis of ceramic chip capacitors at high frequency
(Видавництво Національного університету "Львівська політехніка", 2002) Golumbeanu, Virgil; Svasta, Paul; Ionescu, Ciprian; University Politehnica Bucharest, Romania
The dimensions of monolithic ceramic capacitors today becomes very small and they presents good performance at high frequency. It is used in various high frequency circuits for impedance matching, DC block, filter, bypass and decoupling functions. For the best performance in these applications , low equivalent series resistance and equivalent series inductance is required. This parameters are analyzed in the paper for multilayer ceramic chip capacitors. Using an impedance analyzer and SPICE simulations the impedance of capacitors at high frequency is presented.
Aspects of EMC- Evaluation of LIN- Transceivers
(Видавництво Національного університету «Львівська політехніка», 2002) Körber, B.; Sperling, D.; Kalita, W.; Sabat, W.; FTZ e.V. an der Westsächsischen Hochschule Zwickau (FH), University of Applied Sciences, Zwickau; Rzeszów University of Technology
With this paper a proposal for EMC- Evaluation of LIN (Line Integrated Network)-Transceiver is presented. It is based on EMC- standards for semiconductors and automotive applications and can be applied to Stand Alone LIN Transceiver and Embedded Systems with an on chip LIN Transceiver (Automotive System Basis Chips). At this time there are positive experiences by using this evaluation proposal on LIN Transceivers from different manufactures and samples in the last two years. It can be shown, that the results of the measurements have a very good reproducibility. The proposal for EMC- Evaluation of LIN- Transceivers is based on the same procedure as EMC- Evaluation of CAN – Transceivers, witch is successful implemented in Transceiver evaluation for automotive applications and has a correlation to vehicle measurements.
Compression of signals obtained from the fibre-optic flame monitoring system
(Видавництво Національного університету "Львівська політехніка", 2002) Wójcik, Waldemar; Kotyra, Andrzej; Golec, Tomasz; Duk, Mariusz; Technical University of Lublin, Polan; Institute of Power Industry, Poland
In the article, we present application of wavelet transform and Fourier transform in compressing signals obtained from the flame monitoring system. The results of compression are compared by function of relative error vs. compresion ratio.
Concentration dependence of Curie temperature of two-sort temperature of amorphous magnets
(Видавництво Національного університету "Львівська політехніка", 2002) Margolych, Iryna; Lviv State Medical University named after Danylo Galytsky
The Curie temperature of two-component amorphous ferromagnet is found using the expansion of the free energy in powers of order parameter. For the model with liquidtype disorder introduced via hard spheres structure factor the explicit expression for the concentration dependence of ferromagnetic ordering temperature is obtained.
Design of photoelectric convertors on the basis of Si-Ge solid solutions
(Видавництво Національного університету "Львівська політехніка", 2002) Druzhinin, Anatolij; Ostrovskii, Igor; Liakh, Natalia; Lviv Polytechnic National University
Electric and photoelectric properties of Si1-xGex (x=0.1) whiskers were investigated. The whiskers were grown by method of chemical transport reactions in closed Si-Ge-Au-Hf-Br system. Concentration of Hf in whiskers is 1,6⋅10-2 3, concentration of Au is 10-3 3. The samples have n-type conductivity; their resistivity ρ changes from 0.5 to 12 Ω⋅cm depending on the whisker diameter. The whisker diameters change from 10 to 80 µm, the whisker length is equal to 0,5÷5 mm. The whiskers were shown to be photosensitive both in photovoltaic and in photoresistive regimes. Photo-e.m.f. value is about 100 mV in the whisker with small diameter (d=20 µm) and it decreases at a rise of the whisker diameters from 20 to 80 µm. Appearance of photo-e.m.f. is caused by existance of Shotki barrier in SiGe-Pt contact to the whiskers. Dimensional effect of the whisker photo-e.m.f. is explained by the dimensional dependence of the whisker resistivity. High values of photo-e.m.f. for Si-Ge whiskers allow their using for photoconvertor design.
Dynamic properties of humidity sensor with active layer based on composite material: PVA + Sn
(Видавництво Національного університету "Львівська політехніка", 2002) Hotra, Zenon; Proszak, Danuta; Melnyk, Oleg; Woś, Bogdan; Lviv Polytechnic National University; Rzeszów University of Technology, Dept. of Electronic and Communication Systems; Rzeszów University of Technology, Department of Heating and Climatization; Rzeszów University of Technology, Department of Physics
This paper presents results of the researches upon humidity sensors based on humidity sensitive composite material: PVA + Sn. Construction of the sensor is presented. Influence of electrodes’ configuration and arrangement on static characteristics and dynamic properties of the sensors are also included.
Dynamics of modulation spectrums of piezophotoconductivity of monopolar semiconductor
(Видавництво Національного університету «Львівська політехніка», 2002) Stakhira, Pavlo; Stakhira, Roman; Rzeszów University of Technology; Lviv Polytechnic National University
Piezophotoconductivity is being analyzed - phenomenon stimulated by common action of light from spectrum region that corresponds to interband absorption and strain. The case of interband optical absorption of the system that is under the influence of adiabatic low frequency disturbance, caused by pressure, and high frequency disturbance, caused by light action, is considered. It is shown that absorption factor of a system, which is under an action of combined disturbance, is a periodic time function with the period determined by low frequency disturbance. The equation of dynamics of nonequilibrium current carriers' concentration in the conditions of acoustic-light excitation was obtained. The peculiarities of dynamics of spectrum of interband absorption of the strained semiconductor were considered.
Eelectrooptical devices based on the structure of planar waveguide – smectic C* - planar waveguide
(Видавництво Національного університету «Львівська політехніка», 2002) Mikityuk, Zenon; Dalanbayar, Bolormaa; Lviv Polytechnic National University; Department of Physics, Mongolian Academy of Science, Ulaanbaatar, Mongolia
Unique optical properties of chiral liquid crystals allow to use them in different electrooptical devices. It is possible to filtrate the light by length of a wave with the help of structures waveguide - liquid crystal - waveguide. Besides the electrical control of such structure enables to use the planar waveguide – smectic C* - planar waveguide structure as the switch without the complex constructive solutions.
Efficiency improvement of microelectronic devices for spectral transformation of signals
(Видавництво Національного університету «Львівська політехніка», 2002) Dorosh, Natalija; Kuchmiy, Galyna; Lviv Polytechnic National University
The methods of increase of efficiency of microelectronic devices for spectral transformation of signals are shown, at the expense of use of algorithms of fast spectral transformations with active use of pauses between receipt of readout of a researched signal. The structural organization and functionalities of the digital microprocessor NM6403, on the basis of which it is possible to realize algorithms of spectral transformations in different bases of functions is given.
Electromagnetic field strength sensor for traffic-safety security
(Видавництво Національного університету «Львівська політехніка», 2002) Sopilnyk, Lubomir; Lviv Polytechnic National University
Elements of the silicon TCD design and technology
(Видавництво Національного університету "Львівська політехніка", 2002) Łysko, Jan M.; Nikodem, Marek; Latecki, Bogdan; Górska, Marianna; Studzińska, Krystyna; Institute of Electron Technology, Poland
Silicon TCD (Thermal Conductivity Detector, katarometer) chip analytical model, elements of the design and technology are presented. Detector was designed for the pTAS (Micro Total Analysis System) application to recognize the composition of the different gas mixtures. TCD consists of the two pieces : glass plate and silicon chip. Two parallel flow channels 15 000 pm long, 400 pm wide and 50 pm deep were etched in the silicon chip and milled in the glass plate. Some of resistors were designed to act as a heaters and the other ones as a thermo resistors. Composition changes of the mixture flowing throughout the channel cause the temperature distribution changes and thermo resistors electrical response. Distance between the heaters and thermo resistors is of the great importance to the TCD sensitivity. VLSI silicon technology was applied to reduce geometrical dimensions and micromechanical technology to over-hange resistors across the flow channels to reduce thermal capacity and heat loses to the bulk and environment.
Epitaxial garnet films for microwave electronics
(Видавництво Національного університету «Львівська політехніка», 2002) Yushchuk, Stepan; Yuryev, Sergij; Lviv Polytechnic National University
The technology of growth the substituted yttrium-iron monocrystalline garnet films (YIG) on the monocrystalline substrates of the gallium-gadolinium garnet (GGG) with the orientation (111) by the isotermal dipping method of liquid phase epitaxy was carried out. The penetration of La3+ ions into structure of YIG leads to decreasing of lattice mithmatch between the ferrite film and substrate .The control of growth speed of the epitaxial films on the whole process of growing and application of the compulsory mixing of melt-solution of oxides enables to receive the films with homogeneous thickness and small magnetic losses. The penetration into the YIG structure films the non-magnetic Ga3+ and La3+ ions considerably improves their thermostabillity without an essential increasing of the ferromagnetic resonance linewidth (FMR).
Fibreoptic humidity sensor using of CoCl2 as an active layer
(Видавництво Національного університету "Львівська політехніка", 2002) Proszak, Danuta; Melnyk, Oleg; Woś, Bogdan; Rzeszów University of Technology, Poland; Lviv Polytechnic National University; Rzeszów University of Technology, Department of Physics, Poland
The paper presents construction of the fibre optic humidity sensor with active layer based on CoCl2. Dynamic properties of the sensor were examined as well as the processing characteristics.
High ohmic measurements of thick film glass layer insulators
(Видавництво Національного університету "Львівська політехніка", 2002) Jakubowska, Małgorzata; Grzesiak, Wojciech; Institute of Electronic Materials Technology, Poland; Institute of Electron Technology, Poland
Investigation of indium antimonide microcrystals irradiated with fast neutrons
(Видавництво Національного університету «Львівська політехніка», 2002) Bolshakova, I.; Leroy, C.; Kumada, M.; Lviv Polytechnic National University; Laboratory R-J.A.-Levesque, Montreal University, Canada; National Institute of Radiological Sciences, Japan
Microcrystals of III-V semiconductor compound indium antimonide were obtained by means of complex doping in the growth process. Such compounds are stable after irradiation with fast neutron fluences up to 1016 n⋅cm-2. Magnetic field microsensors developed on their base are applied in magnetic measuring systems for charged particle accelerators and in the space instrumentation building.
Laboratory circuit to measure small capacity
(Видавництво Національного університету "Львівська політехніка", 2002) Chamiecki, Andrzej; Schwarz, Ulrich; Wisz, Bogusław; Zając, Kazimierz; Hybres Electronics Ltd., Rzeszów, Poland; Fachhochschule Südwestfalen, Soest, Germany; Rzeszów University of Technology, Dept. of Electronic and Communication Systems, Poland
This paper presents simple method for small capacity measurement that is based on the operational amplifier oprating as an integrator with the polarization current compensation. Basing on this concept, the laboratory measurement circuit was designed and realized. The developed method accounts also for the circuit self-capacity that in turn allows for measurement error reduction up to 10 % for capacity of several pF. The experiment results were presented, and the measurement results were discussed.
Limitation of third harmonic of supply network current in phase control systems of commutator motors
(Видавництво Національного університету «Львівська політехніка», 2002) Gąska, Dariusz; Kalita, Włodzimierz; Zając, Kazimierz; HYBRES Electronics Ltd., Rzeszów; Rzeszów University of Technology, Dept. of Electronic and Communication Systems
This paper presents simple non-conventional circuit design for the third harmonic limitation of power supply current that is drawn by the medium power commutator motor with the phase control. The proposed solution features a simple design, low manufacture costs and operational effectiveness.
Low-current contacts analysis with the application of mathematical-physical models
(Видавництво Національного університету "Львівська політехніка", 2002) Zlonkiewicz, Zbigniew; Technical University of Lublin, Institute of Fundamental Electrical Engineering and Electrotechnology, Poland
The paper presents the results of modelling of contacts used in low current circuits. Mathematical and physical models are useful in the analysis of such contacts to describe the complex real shape of contact areas. FLUX 2D packages have been used for simulations assuming contact model in the form of an ellipse. The selected contacts are covered with a hard golden layer on a PdNi20 beneath layer. The distribution of current intensity, power and voltage in the contact areas has been determined.