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- Ponencia en CongresoAdvertise your A/D converter, a SP teaching strategy(2010-03)"The goal of this paper is to invite the reader to consider role-playing as a method to train Signal Processing students for professional functions they would undertake in their future careers. Interaction, communication skills and learning purposes of SP concepts are key elements of this approach. An example applied to Analog to Digital converters is detailed, to show the advantages of this technique and the enthusiasm awakened."
- Ponencia en CongresoModel predictive control of a current source inverter together with its current source(2016-10)"Over the past years a great amount of research has been done to interconnect different energy sources with the power grid or different types of loads. Current source inverters have proved to be a good option due to its high reliability, fault tolerant capabilities, quasi soft switching and the use of lower capacitor values among others. Most of the current source inverters topologies have a current source as input, which could be implemented with a buck converter, and they are controlled with cascaded linear control (usually PI controller), rotating frame coordinate transformation and a modulation stage. In this paper a predictive control strategy of a current source inverter together with its associated current source is presented. This strategy allows to track not only the output voltages at the load but also the current source within a single controller. The control algorithm makes use of a discrete time model of the whole system so as to predict its future behaviour for each one of the available switching combinations. Each one of the predicted values are used to minimize a set of predefined control goals within a multiple term cost function that includes cost associated with the commutation frequency and the reference tracking. Simulation results show a good behaviour and fast dynamics with a low switching frequency of all the switches involved. These characteristics make the proposed controller a suitable option to use with high power inverters."
- Ponencia en CongresoApplication of robust control to a cryogenic current comparator(2016-07)"We describe the design and implementation of an H ∞ controller for PTB's 14-bit cryogenic current comparator (CCC). Measurement results obtained using either the newly implemented digital H ∞ controller or the conventional analog integrator are consistent. In a wide frequency range, the system's noise figure is improved when using the new controller."
- Ponencia en CongresoPower supply rejection and sensitivity analyses of a peak current source with emitter degeneration(2022)"Technology developments are demanding increasingly stringent requirements in terms of Electromagnetic Com patibility (EMC). For IC designers, this implies increasing Power Supply Rejection (PSR) while at the same time reducing the Icc spectrum. This work provides a theoretical analysis of the Peak Current Source with emitter degeneration (PCS-ED), a well known current mirror to achieve high PSR, which gets improved even further by the emitter resistance. The trade-off between the output current and the PSR were analyzed, as well as a sensitivity analysis to quantify the effects of the emitter degeneration. Experimental measurements have been performed to validate the immunity of an off-the-shelf bipolar transistor array from 100kHz up to 1GHz. Results showed that despite the small-signal analyses predicted a considerable improvement, the non-linear effects introduced by the input stage remained as the limiting factor in terms of PSR, leading to similar responses in the Peak Current Source (PCS) and the PCS-ED, despite one having much larger PSR than the other."
- Ponencia en CongresoMeasurement of the sound-absorption coefficient in situ in eggs cartons using the Tone Burst Method(2010-06)"A typical solution in an enclosed space, such as a room, is that the reduction in sound level is the results from the installation of eggs cartons materials or fruits cartons materials (for example apple, pear or peach tree). The Tone Burst method is used to measure the sound absorption coefficient of a material at any desired angle of incidence. The goal for this paper is demonstrate that these cartons are a myth when they are used like reducer of the sound level in an enclosed space."