Este libro contiene las notas de clase del curso de Circuitos Lineales que se imparte en la Escuela de Ingeniería de Telecomunicación de la Universidad Politécnica de Cataluña (UPC).
El enfoque adoptado es el de presentar los circuitos como procesadores de señales analógicas.Es por ello que en el texto se da una gran importancia a conceptos tales como función de red,respuesta frecuencial,trazados de Bode y desarrollos en serie de Fourier.El objetivo es que los estudiantes se familiaricen con la utilización del punto de vista frecuencial para plantear soluciones originales a problemas reales de diseño.
Las técnicas de análisis y diseño de circuitos que se exponen en este libro quieren animar a la experimentación.Es por ello que dispositivos como el amplificador operacional,el transformador o incluso la línea de transmisión tienen asignado un espacio de calidad
Miguel, J.; Herranz, J.; Miro, J.; Palà-Schönwälder, P.; Sanz, M. Simposium Nacional de la Unión Científica Internacional de Radio p. 772-775 Presentation's date: 1991-09-24 Presentation of work at congresses
Chaos, apparently disordered behaviour which is nonetheless deterministic, is a universal phenomenon which occurs in many systems in all areas of science. For it to have place, the equations describing the situation must be nonlinear. In this paper chaos is introduced via an actual circuit and, by using a digital storage osciloscope and an integrated audio amplifier, it possible to get sights and sounds of chaos.
After a brief overview of unguided optical communications, this paper presents a system for intelligent photo-buoying of vehicles which has been implementad into a public transport controlling system in a urban traffic environment. The system utilizes a infrared bidirectional communication link for demanded data transmission from buoy to vehicle. Experimental results clearly show that infrared radiation-based systems, instead of the more frequently used microwaves-based, may offer a feasible and competitiva solution in certain types of traffic flow improvement applications.
Puerta, A.; Sanz, M.; Miró, J.M.; Miguel, J. IEEE International Symposium on Circuits and Systems p. 2201-2204 DOI: 10.1109/ISCAS.1990.112301 Presentation's date: 1990-05 Presentation of work at congresses
A computer-oriented method for exact frequency-domain analysis of nonideal switched-capacitor (SC) networks is presented. It is based on the utilization of an SC macromodel for the operational amplifiers (op amps) when its own clock frequency tends to infinitum. This method extends the capability of a similarly based one previously developed by the authors. Its application allows the z-domain transfer functions, the complete frequency spectrum, and response sensitivities to element changes to be obtained in a quite inexpensive way. It basically consists of closed-form manipulations over a reduced set of matrices derived by means of an adaptation of the two-graph modified nodal approach. Therefore, no additional matrices need to be obtained. Also, the need for explicit numerical integration in each phase is eliminated because it is included in the procedure. This technique not only reduces the computational cost of spectral analysis of SC networks, but also makes exact sensitivity calculation very easy when compared with previously published works
In this paper, we will develop a systematic approach to the realization of grounded inversely or linear voltage-controlled capacitors. These new devices are able to be implemented with less operational amplifiers than the previously reported ones. Moreover, they are absolutely stable (D.C.S. and S.C.S.) Finally, a more detailed study of the inversely controlled capacitor is achieved and its operating frequency range is evaluated taking the finite GB product of the O.A’ § into account.
This article covers the operation, design procedures and the applications of a microcomputer-based digital dynamic control system (d.d.c.) and underlines how the addition of a simple analogue interface on a small personal computer allows the designer to be come familiar with the digital dynamic control techniques in a real (not simulated) environment. The system described consists of an eight multiplexed input a-to-d converter, a d-to-a converter with power outputs and a six input adder. Thus multiple feedback controlling only one output variable is possible. Alternative interfaces are also described; their object is acquiring data and simplifying the software which the microprocessor needs to make data conversion.
This paper describes a microcomputer-based algorithm used to control a dc separately excited motor for electric vehicle drive. The control programme consists essentially of two secondary programmes which perform respectively the command, and the output decision making tasks. The algorithm simulation on a Hewlett-Packard Model 64000 Logic Development System showed that it was possible to achieve an average execution time of 1 millisecond which is very short when compared to the mechanical time constant of the motor.