Ionel Bostan

FPAA implementation of signal processing circuits for radiation sensors

In this paper we present new application of FPAA (Field Programmable Analog Array) circuits for analog signal processing from radiation sensors. We used the dynamically reconfigurable FPAA AN221E04 from Anadigm for implementation of analog circuits like programmable filters and amplifiers suitable for interfacing with radiation sensors. The introductory part of the paper contains aspects regarding radiation sensors, analogue circuits for sensors interfacing and signal processing and reconfigurable analog circuits. The last part of the paper presents the implementation of filters and amplifiers with field programmable analog circuits.

Systematic odometry errors compensation for mobile robot positioning

This paper presents some aspects about measurement and compensation of the systematic odometry errors for differential drive platforms. The experimental results obtained by running two different UMBmark tests show that systematic calibration can reduce systematic odometry errors more than 10 times.

Dynamic electronic model for a DC motor - Simulation and experimental validation

Modelling of a real system using different approaches is wide spread in the research and academic communities. There are many studies in literature that treats different ways of simulating systems more or less complex. In this paper, we developed a different approach for modelling a separate excitation DC motor. The proposed article is focused on finding a suitable model that represents the dynamic regime of such motors. Our approach uses an electronic implementation of the mathematical model of the DC motor. A special attention was given to the experimental determination of the mechanical parameters. By this approach the beneficiaries of this system, which will be engineering students, can have a better understanding on how the electronic circuits could be used to simulate a real system. Also our approach could serve for implementing remote laboratories for systems modelling-simulation for electrical engineering studies.

Design of programmable cellular automata based cipher scheme

This paper presents an originally encryption system implemented on a structure of hybrid additive programmable cellular automata (HAPCA). As the development of cellular automata (CA) applications is generally an experimental effort, the research implies the exploration through simulation of the huge space of cellular automata local rules and global states. The encryption and decryption modules are identically and the cryptosystem is featured by its large key space and high speed due to cellular automatas parallel information processing. The method supports both software and hardware implementation. In this paper we present a fully functional software application for the data encryption of yahoo messenger conversations.

Evolutionary computing systems for obstacle avoidance

In this paper we present two neuronal network architectures to perform the task of obstacle avoidance for a little mobile robot named Khepera, which has 8 infrared proximity detectors and two independent motors. The first one used Hebbian learning for weight adaptation and the second one use evolutionary weight selection. The experiments are only simulated.

Analysis of a photo-voltaic-thermal panel using comsol and simulink/simscape tools

A solution to improve the lower overall photo-voltaic panel efficiency is to provide it with a forced cooling system. In this way a hybrid conversion device is derived and electric and thermal energies are obtained simultaneously. To model such system, two major and different components should be considered: solar cells and cooling radiator. The main purpose of this paper is to study the electrical and thermal effects in an inter-correlated approach.

FPGA Implementation of frequency dividers in vocational education

This paper present a group of practical activities which was designed to improve practical activities in teaching frequency dividers in VET using a tool named ProjectX.

LabVIEW application for studying of successive approximation A/D conversion

This paper presents an application for studying of analog-to-digital conversion using successive approximations principle. The application models and measures the significant parameters of SAR ADCs, together with animation of the converter operation, and draw typical waveform. These facilities make the application very useful for teaching and training students in data conversion domain. The application is realized in the LabVIEW and can run stand-alone or it can be accessed and controlled from internet, within a web browser.

Systemic design for integrated digital circuit structures

The design of digital structures that are implemented in FPGAs or ASICs is subject to many constraints. This work proposes that systemic design should be used to optimize area/speed tradeoffs in simple digital structures (adders). Systemic approach in complex problem solving allows the analysis and synthesis of objects of different nature and complexity from a holistic point of view, considering the initial complex factors for each system. Although there are a variety of adder circuits (Ripple Carry Adder; Carry Skip Adder; Carry Increment Adder; Sklansky Adder; Kogge & Stone Adder), following the systemic design, optimum structures are obtained, given the initial complex constraints.

Design, microfabrication and testing of acceleration microtransducers for automotive applications

An original new design for manufacturing a piezoresistive micro-accelerometer is presented. As resulted from the computer simulations, and, after that, from the functional testing of the accelerometer, the new design provides a good response from the sensor, which reflects in its sensitivity. The device was manufactured by silicon bulk micromachining, using standard microsystems technology. The tests results showed a heterogeneous structure, with good response signals.