Direct measurement of current derivative using a delta-sigma modulator for Sensorless Traction Motor Control

This paper discusses a new method of direct measurement of the current derivative applied to determine an electric motor inductance required for efficient and reliable control of sensorless AC electric drives. The method is based on the measurement of the voltage drop across a calibrated inductor implemented into the power circuit of the motor drive inverter. In order to increase accuracy and reduce transients and oscillations the measured voltage drop is processed using a delta-sigma modulator. The data stream generated by the modulator is then transferred to a microcontroller supported demodulation for further processing and filtering. The paper also presents the results of experimental investigations of three different shunt inductors. The results demonstrate a high accuracy and noise immunity of the proposed method

Behavioral modeling for sampling receiver and baseband in Software-Defined Radio

Projecte realitzat en col.laboració amb Illinois Institute of TechnologySoftware Defined-Radio (SDR) consists of a wireless communication in which the transmitter and the receiver are controlled by means of software. Its ultimate goal is to provide a single universal radio transceiver capable of multi-mode multi-standard wireless communications. Modeling of the proper circuits and new designs aimed at SDR is necessary for further development and experimentation. It sharpens our understanding of fundamental processes, helps to make decisions and provides a guide for training exercises. Due to the lack of these models two independent and different models have been created based on new proposed designs. Each modeled design belongs to a different layer of abstraction and therefore, the tool used is different as well. The first proposed model consist of a Simulink (Matlab) file which models the discrete-time signal processing used in a Discrete-time receiver for Bluetooth Radio. The results show good performance when processing a signal that has been transmitted through a noisy channel. The signal at each step is visualized to see the individual effect of each building block. The second proposed model narrows down the topic and focuses on a Widely-tunable, Reconfigurable Analog Baseband filter, for which a Verilog-A model, by using Cadence, has been created. The outstanding feature of the filter is that its programmability is based on the duty-cycle of the input control signals. Moreover, Verilog-A modules bring the design really close to the real circuit, allowing the designer to face problems that the real circuit will present and easing the replacement of the building blocks with new ones when desired. The results for this model show a very little error within the passband of the filter that increases when the attenuation introduced for the stopband becomes higher

Montaje, prueba y calibración de sistemas de encefalografía EEG OPEN-BCI

The objective of this TFG was to assemble, test and calibrate two electroencephalography OPENBCI systems. On the one hand, the OpenBCI 4-channel Headband and on the other hand the Ultracortex IV both 8-channel and 16-channel. When the assembly was finished, different tests were carried out with different people, so that different responses obtained could be verified and analyzed.El objetivo de este TFG fue montar, probar y calibrar dos sistemas de electroencefalografía de OpenBCI. Por un lado, la Headband de OpenBCI de 4 canales y por otro lado el Ultracortex IV tanto de 8 canales como de 16. Cuando el montaje se finalizado, se realizaron distintas pruebas con personas diferentes, de tal manera que se pudo comprobar y analizar las diferentes respuestas obtenidas

Behavioral modeling for sampling receiver and baseband in Software-Defined Radio

Projecte realitzat en col.laboració amb Illinois Institute of TechnologySoftware Defined-Radio (SDR) consists of a wireless communication in which the transmitter and the receiver are controlled by means of software. Its ultimate goal is to provide a single universal radio transceiver capable of multi-mode multi-standard wireless communications. Modeling of the proper circuits and new designs aimed at SDR is necessary for further development and experimentation. It sharpens our understanding of fundamental processes, helps to make decisions and provides a guide for training exercises. Due to the lack of these models two independent and different models have been created based on new proposed designs. Each modeled design belongs to a different layer of abstraction and therefore, the tool used is different as well. The first proposed model consist of a Simulink (Matlab) file which models the discrete-time signal processing used in a Discrete-time receiver for Bluetooth Radio. The results show good performance when processing a signal that has been transmitted through a noisy channel. The signal at each step is visualized to see the individual effect of each building block. The second proposed model narrows down the topic and focuses on a Widely-tunable, Reconfigurable Analog Baseband filter, for which a Verilog-A model, by using Cadence, has been created. The outstanding feature of the filter is that its programmability is based on the duty-cycle of the input control signals. Moreover, Verilog-A modules bring the design really close to the real circuit, allowing the designer to face problems that the real circuit will present and easing the replacement of the building blocks with new ones when desired. The results for this model show a very little error within the passband of the filter that increases when the attenuation introduced for the stopband becomes higher