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In this paper two pupil detection algorithms (based on Starburst and circular Hough transform) for the eye tracking application are presented. The operation of the eye tracker device depends mainly on the infrared video camera performances, PC processing power of the video signals and the precision of the pupil detection algorithm. Both algorithms used for the eye tracker implementation have been...
A pair of Re-based double perovskites, A2BB'O6 have been analyzed in this paper, presenting ferrimagnetic properties but different characteristics, the Ba2FeReO6 being a metal and the Ca2FeReO6 an insulator above the transition temperature to the ferrimagnetic state. The study was performed at 10 GHz in microwave range and the thermal evolution of the electromagnetic parameters of the two materials...
In the last few years an increasing interest for the improvement of communication with people with disabilities for therapeutic purposes as well as educative, has been observed. For this purpose, a complex communication system (ASISTSYS), based on key-word transmission from the patient and vocal and/or key word reply from the caretaker has been proposed. The system insures radio communication between...
This paper describes the implementation of a CMOS clock recovery circuit (CRC) based on the PLL architecture, which has an edge detector stage at the input. The system provides frequency detection of random inputs and is therefore well suited to clock recovery in data communications. The NRZ input data signal is differentiated and full-wave rectified in the same circuit in order to show the second...
A study of the electrical resistivity in microwave range for a class of perovskite manganites was performed in this paper. The work strategy was the structural simulation of the considered materials: La1-xAxMnO3 (A = Ca, Sr, Ba or A = Li, Na, K and Rb), with 0 ?? x ?? 0.4, respectively 0 ?? x ?? 1. Materials are characterized by colossal magnetoresistance and consequently present one or two peaks...
This paper presents results from the design and implementation of a subsystem integrated into a wireless patient monitoring and communication network. The presented subsystem is designed to assure communication between patient and caretaker at a basic level using predefined key symbols/sentences and transmit basic biological parameters. The system consists of two distinct elements - first the patient...
In this paper is presented the implementation of a transceiver for 3Gb/s operation, fully compatible with low-voltage differential signaling (LVDS) and Gen2i, Gen2m serial ATA standards. Due to the differential transmission technique and the low voltage swing, LVDS allows both high transmission speeds and low power consumption at the same time. The proposed transceiver is composed by a transmitter...
In this paper, a new linearization technique using a second generation of current conveyor doublet (CCIID) in CMOS technology is presented. The proposed CCIID is made up a mixed parallel and cross connection of two CCII stages. The output current is given by the difference between the two output currents provided by the two CCII stages. Due to the cross-connection of the two CCII stages, the nonlinearities...
Glass-ceramic products for the LTCC technologies were analyzed in this paper from the point of view of their dielectric properties at high frequencies. A frequency domain of 2.4 - 18 GHz was considered, in microwave range, and our results are coming to complete the results obtained until now at lower frequencies. A detailed structural simulation was performed with help of the High Frequency Structural...
This paper presents a bipolar implementation of second order Gm-C filter using a new type of transconductor cell, based on ldquomulti-sinhrdquo doublets, made up of two second generation current conveyors (CCII). The advantages of the proposed structure are: (a) VLSI implementation of two types of filters - low-pass (LP) and band-pass (BP) - on the same chip; (b) different possibilities of tuning...
The paper presents a research project in communication systems for people with neuro-muscular disabilities. It deals with the design and implementation of an electronic system for the communication with people with major neuro-muscular disabilities. While considerable efforts have been made worldwide to find solutions for developing complex communication systems for people with severe disabilities,...
In this paper a new highly linear transconductor consisting of N second order current conveyors (CCII) coupled pairs with linearization resistors was designed for low-voltage operation. By applying variable offset voltages to these CCII coupled pairs, the linearity of the resulted transconductor can be substantially improved. We show that the type and the dynamic range of the obtained transconductor...
In this paper, a new method for implementing a ldquosinhrdquo lossy ELIN integrator, using a ldquosinhrdquo ideal ELIN integrator, is presented. The proposed ldquosinhrdquo lossy ELIN integrator is based on a variable mapping in the state equations which describe the operation of an ideal integrator and by unbalancing the bias currents of the ldquosinhrdquo nonlinear transconductor. The simulations...
A parametrical analysis of the electric permittivity evolution with frequency was performed in this paper. We have considered a board material class with PTFE (polytetrafluoroethylene) base and different reinforcement materials, for comparison. Characteristics of each material are different, considering their internal geometry and reinforcing fibers nature. Materials structures were simulated using...
In this paper, a differential CMOS automatic gain control amplifier is presented. The proposed architecture uses a differential variable gain amplifier, implemented with a Gilbert cell and provides an automatic gain control amplifier for both alternations of the input signal. It yields almost 20 dB dynamic range of input 100 MHz sinusoidal signal and provides a constant differential output of 200...
In this paper a BiCMOS implementation of second order current mode "tanh" ELIN filter, is presented. The ELIN system is obtained by applying the "tanh" mapping to the prototype filters described by state space equations. The advantages of the proposed structure are: VLSI implementation of three types of filters - low-pass (LP), band-pass (BP) and high-pass (HP) - on the same chip,...
In this paper a comparative analysis of the noise behavior of two topologies of elementary transconductor stages (with differential pair and with second generation current conveyor - CCII) in bipolar and CMOS technology is presented. This study is made by a theoretical calculation of the signal to noise ratio (SNR) for each considered configuration, and also by a 0.8 mum BiCMOS technology simulations;...
There is a permanent interest to increase the dynamic range when active filters are designed. A new technique to increase the dynamic range of "tanh" and "sinh" current amplifiers is presented, by using the inverted transfer function. The proposed technique allows electronic tuning of the dynamic range and gain by external bias currents. Then the possibility of using these linearized...
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