In this paper, a complete high-speed Continuous-Time Bandpass Delta-Sigma modulator for digital receiver applications is modeled, using VHDL-AMS. The main Continuous-Time Delta-Sigma modulator’s nonidealities such as excess loop delay, clock jitter and multi-bit feedback DAC element mismatch in the modulator loop are also modeled and their effects evaluated. An accurate understanding of these non-ideal phenomena allows to estimate the limits of the modulator and hence to design more robust building-blocks.
The project proposes accomplishing of a new informatics system architecture, under the form of a high-speed virtual laboratory, with a multitask type access on laboratory work, to remove users’ waiting lists and allow reconfiguration of electric assembling in real time. The accomplished project was preceded by a thoroughly analysis of didactic requests according to economic problems, so that, the following aspects would be solved: Students will access from the distance real instruments and will accomplish online test workbench, in the idea of understanding all the aspects of a real...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
The scientific innovation of this paper consists in the preparing of one methodology to forecast the sportsmen training through applying of one mathematical modelling method that, through the exponential functions, establishes, with an approximation of maximum 2%, the forecasting of the sportsmen’s individual parameters enhancing. In most cases, the extrapolation functions, obtained by computing technique, overlap the real values obtained after a short training period. This phenomenon demonstrates that the mathematical modelling contributes efficiently to improve the training and contesting...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
Krešimir Malarić, Anamaria Štambuk, Maja Šrut, Mirta Tkalec
During the last twenty years exposure of living organisms to radiofrequency/microwave electromagnetic field (RF/MW EMF) has dramatically increased, mainly because of usage of different communication systems as well as modern electronic devices. Exposure to radiation of wireless mobile phones which operate at frequencies of 900 and 1800 MHz has risen. The evaluation of effects of this kind of radiation on all living organisms is thus of great importance. In this work genotoxic effects of RF/MW radiation on earthworms (Eisenia fetida) using Comet assay were investigated. Earthworms are soil...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
The fluctuating light conditions cause troubles in image processing based area and dimension measurement. This article describes the hardware implementation and measured properties of canny-based edge detection and an optimal thresholding method. Both units were implemented on proprietary FPGA-based image processing system for “on the fly” measurement. The optimal threshold algorithm presented is able to adapt to changed light conditions and calculates the object size counting the pixels above threshold. The other method uses the first and the second differentiation combined with low-pass...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
Telmo Gomes dos Santos, Pedro M. Ramos, Pedro dos Santos Vilaça
Welding of aluminium alloys has undergone a significant development with the Friction Stir Welding (FSW) process. Quality assurance of welded structures is always an important issue for industrial applications and although the good quality of FSW joints, some defects may arise. These defects are difficult or even impossible to detect with conventional non destructive testing (NDT) techniques. This paper presents a detailed analysis about the performance of conventional NDT planar eddy current probes to detect FSW defects. The analysis is based in the impedance measurements of the probes in...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
The paper presents a prototype of EIS analyzer, which uses digital potentiostat/galvanostat. The separate paths and AD converters were used for sampling DC and AC components of signals proportional to current through and voltage across the impedance of the measured object. The converters are controlled by different processors, which performs functions tightly connected with realization of two tasks of EIS analyzer: potentiostat/galvanostat controlling and impedance measuring. In order to decrease the influence of the real-life parameters of used operational amplifiers and the parasitic...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
Rapid mixing of two or more analytes in microchannel networks is essential in the design of most biochemical, immunoassays and DNA analysis microsystems. In this paper we report numerical simulations of a chaotic magnetohydrodynamic (MHD) stirrer that exhibits fast mixing of steady pressure-driven flows in microchannels at medium-low Reynolds number. The proposed mixer is benchmarked against a MHD stirrer prototype recently reported in literature. Numerical results show that the proposed device has a higher and faster mixing efficiency with respect to recent literature.
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
Shade matching is a much complicated task then it may look like. Variability of the factors which influence the shade matching procedure should be minimized. There is a need for a new, better, logically and scientifically arranged shade guide which would cover the complete color range of natural teeth. The project proposes to accomplish a color prosthetical establishing performing system through image processing methods by using cumulative informations concerning chromatic analysis and also the transparency variation depending on work’s 3D geometry. By realizing a bidirectional communication...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download
Bruno Andò, Alberto Ascia, Salvatore Baglio, Nicola Pitrone
In recent years the approach to theoretical teaching and practical training of the undergraduate students in the electrical and electronic measurement courses has received great attention, because the fast development of advanced technologies requires continuously updating the way of teaching electrical and electronic measurements. As far as digital instruments are concerned, only a theoretical support is generally supplied. It is very important to deeply understand the operation of the basic digital instruments, the frequency meter and the dual-slope voltmeter. This task can be achieved by...
Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements · TC4 · 2008 · Download