Moncunill, F. X.; Palà-Schönwälder, P.; Aguila, F.; Bonet-Dalmau, J.; Giralt, M.; Mas, Orestes; Sanz, M.; Miro, J. Simposium Nacional de la Unión Científica Internacional de Radio p. 1-4 Presentation of work at congresses
Mas, Orestes; Miro, J.; Moncunill, F. X.; Sanz, M.; Aguila, F.; Bonet-Dalmau, J.; Giralt, M.; Palà-Schönwälder, P. Simposium Nacional de la Unión Científica Internacional de Radio p. 325-326 Presentation of work at congresses
Mas, Orestes; Miro, J.; Moncunill, F. X.; Sanz, M.; Palà-Schönwälder, P.; Bonet-Dalmau, J.; Aguila, F.; Giralt, M. Congrés Internacional de Docència Universitària i Innovació p. 1-9 Presentation of work at congresses
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
A compact systematic analysis method to obtain closed-form expressions for the z-domain transfer functions of switched-capacitor (SC) circuits with finite gain-bandwidth (GB)-product op amps is presented. This procedure allows exact frequency analysis of general SC circuits without imposing any restriction in the ratio between GB and clock frequencies and, is based on the modeling of each op amp by a suitable SC subcircuit with its own clock frequency, which is made to tend toward infinity
A systematic analysis procedure to obtain closed-form expressions for the z-domain transfer functions of SC circuits with finite GB product op-amps is presented. This method allows exact frequential analysis of a general class of SC circuits, without imposing any restriction in the ratio between GB and clock frequencies.
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.
In this paper an efficient computer program for the analysis of analog and Switched Capacitor circuits is presented. It permits simulation of circuits with a great variety of circuit elements including non ideal AO's. Frequency response is computed by means of the transfer function previously obtained what allows to reduce drastically the execution time. This feature makes the program especially well suited for implementation on a microcomputer.
El interés fundamental de los circuitos de condensadores conmutados radica en su aplicación a la realización de filtros monolíticos y de otros bloques funcionales para su tratamiento analógico de la señal. Resulta del máximo interés disponer de métodos de análisis y programas de simulación que permitan evaluar los resultados de las diferentes técnicas de síntesis.
En este artículo se presenta un programa de simulación, basado en los métodos de análisis desarrollados por los autores, que permite la obtención de las funciones de transferencia y de la respuesta frecuencial de circuitos SC. Para su realización se requiere un soporte informático reducido, lo que, junto con la facilidad de utilización, son sus características más sobresalientes.