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An integrated reset controller (voltage supervisor) is designed and implemented. The system generates a reset signal, active while power supply brownout conditions are detected and for 250 ms after the supply voltage has increased to acceptable levels. The circuit is built in a Deep N-Well (DNW) 5V 0.35μm CMOS process, which provides good isolation between the on-chip devices and the substrate. The...
A Sense and Control Circuit (SCC) developed for amperometric concentration evaluation is redesigned, based on preliminary experimental investigations. This cost-effective circuit comprises a potentiostat for three-electrode electrochemical cell (biosensor) control and a transimpedance amplifier for cell current sensing. Stability, noise robustness and response time are improved, as demonstrated by...
A Smart Sensor used for measuring the concentration of chemical compounds in fluids/solutions is designed, implemented and tested. The sensor comprises a potentiostat employed for three-electrode electrochemical cell (biosensor) biasing, a transimpedance amplifier and a digital interfacing system. The stability of the potentiostat and the linearity of the transimpedance amplifier are theoretically...
The aim of sparse array antenna synthesis is to obtain a desired radiation pattern with a minimum number of antenna elements. In this paper, the antenna synthesis problem is approached in a different manner. Starting from a uniform linear antenna array radiation pattern, the maximum number of elements that can be removed, while maintaining a desired radiation pattern, is determined using genetic algorithms...
In this paper an original method for the synthesis of a planar sparse array antenna is presented. The aim is to obtain a planar sparse array antenna starting from a Dolph Chebyshev radiating elements feeding distribution and cancelling feeding for as large a number of elements as possible while maintaining the performances in terms of directivity characteristics, by applying optimization with genetic...
The paper presents a new approach regarding the design of non-uniform linear antenna arrays with symmetrical elements, using multi-criteria optimization with genetic algorithms. The goal is to optimize the radiation pattern to bring it closer to the desired one, using non-uniform distances between elements and a non-uniform distribution of currents through the elements, for better efficiency. The...
This paper proposes a new method for computing the spectrum of a periodic analog signal, based on the concept of minimizing a square error function. The method involves generating the error function, which is accomplished using symbolic computation with the program Maple, and the minimization of this function using the genetic algorithms and gradient methods using the program Matlab.
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