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The following paperwork presents a multiphase converter for charging of energy storage elements. Modular principle is implemented for the realization of the proposed circuit on the base of resonant inverter topology with reverse diodes and switching capacitor voltage limitation. The converter consists of six identical modules. Simulation examinations of are carried out verifying the circuit functionality...
In this article a problem of special postdetermination of excitation functions of triggers with two logic inputs is presented. BALAR theorem is formulated. A place in sequential synthesis is showed. Reduction of two in one logic inputs is proved.
A novel method for removing multiple switching at the edges of digital signals based on a comparator with dynamic hysteresis is presented. The proposed concept is analytically investigated and a CMOS circuit is designed based on the obtained results. Simulations with Spectre simulator demonstrate its correct operation.
A combined sensor system, based on MEMS, which allows measuring the temperature, and determining the magnetic field, acceleration and angular acceleration at the common coordinate system is described. Thus, the system provides a total of 10 values, characterizing 4 different physical quantities.
This paper presents a study of inter-block jump detection techniques. The CFCSS, RSCFC, SEDSR, SCFC, ECCA, YACCA and SIED techniques were considered. The conducted experiments measure criteria such as detection ratio, run-time and code-size overhead. Next, those criteria are combined and evaluated to determine the best technique. Finally, our results reveal that CFCSS makes the best trade-off between...
This paper presents a fully integrated RC-type relaxation oscillator with high precision over supply, temperature and process calibration by trimming, achieving 50ppm/°C maximum temperature coefficient and 1% final accuracy in the operating range. The low sensitivity to 1.8V supply is achieved by ratio metric technique and generating supply proportional voltage reference and current source. The small...
The paper describes MS EXCEL-based application implementing the processes of encryption and decryption of texts in English and/or Bulgarian using the RSA algorithm. The processes of encryption and decryption are illustrated. The material is used in the educational process in the course “Telecommunication Security” but it can be applied in other disciplines involving issues of cryptographic information...
Mechanical stress sensitivity caused by IC packaging has been analyzed for CMOS test chips of a particular bandgap reference circuit. It has been applied a statistical method for analysis of distributions of measurements obtained from already produced devices. The conclusions have been grounded on theoretical model solved numerically for finding stress dependencies.
The subject of the article is development and an implementation of a digital Phase Locked Loop on programmable logic devices from the FPGA XILINX family. The synthesized structural diagram includes 4 MHz reference crystal oscillator, frequency pre-divider, phase frequency detector, digital filter, digitally controlled oscillator and programmable frequency divider. Different types of phase frequency...
The paper presents a fully integrated PVT variation detection and on-die resistance calibration system for high-speed applications. The proposed system separately measures and compensates the MOS device resistance deviation due to process, voltage and temperature variation. Temperature detection is performed in a range of −40°C to 125°C independently from supply voltage variations. Logic block of...
This paper presents a LabVIEW based system of acquisition, processing and analysis of ECG (electrocardiogram) signals. Biomedical signal acquisition has made great advances in recent years due to the introduction of modern hardware and software technologies. Computer based signal processing systems are becoming an efficient approach for acquisition and analyzing of such signals. In our implementation...
The paper presents study and selection of components (power switches and inductor) of an inverter for induction heating. Power losses in the switches and inductor windings are considered. The comparative study is realized based on using three different types of power switches (IGBT's, MOSFET's and SiC-MOSFET's). Presented loss analyses leads to design requirements for selection of proper switches...
The paper presents loss analysis and improvements of a battery charging system for light electrical vehicles. Possible solutions and design approaches are presented for reducing weight and improving efficiency of the system. The charger system (1500W) consists of rectifier with inrush current limiting, PFC and resonant DC/DC converter. Presented loss analyses leads to selection of proper switches...
This report is dedicated to a new type of system used for testing electronic modules and designed specifically for the needs of the petroleum industry. After testing the electronic modules, the system makes a decision - suitable - unsuitable. Different communication modules communicate between the fuel dispensers and the POS (point of sale) system. The main goal is to raise the efficiency of the process...
This paper considers a series resonant DC-DC converter operating above the resonant frequency. In order to control its output power, a symmetrical controlled rectifier is used, which allows bidirectional energy transfer. On the base of well-known analytical modelling of the resonant tank processes, a series for determination of the main converter quantities is proposed. As a result, the converter...
This paper presents a theoretical comparison of different existing data error detection techniques. The techniques are compared by fault coverage, memory overhead and performance overhead. For this comparison, ten different data error detection techniques are taken into account. In general, the best error detection technique always has the highest fault coverage with low performance and memory overhead...
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