Current Single Event Effects Compendium of Candidate Spacecraft Electronics for NASA

We present the results of single event effects (SEE) testing and analysis investigating the effects of radiation on electronics. This paper is a summary of test results

A high bandwidth, low distortion, fully differential amplifier

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (leaves 86-88).An amplifier for use in driving an analog to digital converter in an ultra-wideband test system was designed and simulated. The amplifier has differential inputs and outputs and a bandwidth of greater than 500 MHz. According to simulation, the linearity for frequencies above 100 MHz is ten times better than amplifiers currently on the market. The design of this amplifier involved: studying impacts of circuit topology on linearity, creating a schematic design, getting a package model, laying out the die and extracting parasitics, and creating simulation tests.by David Michael Signoff.M.Eng

Application and design manual for High Performance RF products

design work much easier NXP’s RF Manual – one of the most important reference tools on the market for today’s RF designers – features our complete range of RF products, from low to high power signal conditioning & high speed data converters. What’s new

EMC Performance of Field Programmable Gate-Arrays: Effects of I/O Standards and Attributes on the Radiated Emissions Spectrum

This research investigates what impact the I/O standards & attributes of a Field Programmable Gate Array have on the radiated emissions spectrum. FPGAs are used in countless digital applications. The use of a Spartan-6 FPGA gives a good representation of a general device with Xilinx being the market leader in supplying FPGAs for a variety of industries. The logic standard, drive strength and edge rate are examined for their impact on that radiated emissions produced. Digital integrated circuits are a well-known and documented source of Electromagnetic Interference due to the fast transitions of period signals. A practical and theoretical understanding of the behaviour of clock signals in the time and frequency domains has been established. The impact of phenomena such as overshoot and ringing from practical signals has been considered for its impact on the emissions spectrum and how this deviates from the theoretical expectations. Logic standard, drive strength and edge rate have been assessed comparatively to determine their influence of peak emissions produced. Of the logic standards tested the LVTTL standard recorded the highest level of EMI across all I/O logic standards approximately 4dB higher than the equivalent CMOS standards. The LVTTL standard recorded the largest variation in emissions across the available I/O driver settings with approximately a 14dB increase from the minimum to maximum I/O driver settings. The LVCMOS logic standards recorded on average across the 3.3 volts, 2.5 volts, 1.8 volts, 1.5 volts and 1.2 volts logic, a maximum change to EMI of approximately 10dB from the minimum to maximum driver settings. Each category of the variable I/O driver settings has been assessed independently to assess the level of change to emissions produced. Average levels of EMI produced under each I/O driver setting have also been obtained and presented to give engineers and designers an indication of how decisions made within the design process can influence the level of emissions produced. It is hoped that this research will provide as a useful tool when designing with programmable integrated circuits such as the Spartan-6 FPGA and the potential EMC impact on the radiated emissions spectrum

Diseño e implementación de un regulador de carga solar para baterías de litio

Este trabajo aborda el diseño y construcción de un regulador de carga solar para sistemas fotovoltaicos de autoconsumo con bancos de baterías de 12V o 24V para el almacenamiento de energía. Incorpora un convertidor DC-DC Buck gobernado por un Arduino Nano, que controla la carga y descarga de la batería, además de optimizar los módulos fotovoltaicos para extraer la máxima potencia disponible mediante el algoritmo Perturb & Observe (MPPT). El circuito, de bajo coste y open source, puede servir de apoyo a la docencia, pero principalmente se ha diseñado de manera robusta, de forma que controle adecuadamente la carga de las baterías en sistemas autónomos, estando a la altura de soluciones comerciales existentes.This work addresses the design, construction and testing of a solar charge regulator for stand-alone photovoltaic 12 V or 24 V battery storage systems. Batteries provide power when there is no solar generation, while the charge controller recharges them safely following the proper charging procedure. It is based on DCDC Buck power stage driven by an Arduino Nano, which controls the charge and discharge of the batteries, and optimizes the solar power output using the Perturb & Observe algorithm. The design is an open source and low-cost tool, allowing anybody to replicate and/or modify it freely. The prototype can be used not only as a teaching resource, but also as a fully functional device, with at least the performance of similar solutions available in the market

Diseño y montaje de un robot Segway

El transporte urbano representa uno de los grandes problemas del S.XXI. La masificación de la población en ciudades ha traído consigo un notable incremento del número de vehículos presentes en las mismas, generando serios problemas de contaminación por las emisiones de los motores de combustión interna y ruido. Además, la infrautilización de los turismos, que generalmente transportan a una o dos personas, se traduce en el colapso de las vías. La necesidad de encontrar una solución eficiente y no contaminante a este tipo de desplazamiento urbano, generalmente de corta distancia, hace que surjan nuevos medios de transporte, como los vehículos segway. En el presente trabajo de fin de grado se muestra el funcionamiento de los vehículos Segway, y el proceso que se lleva a cabo para diseñar y desarrollar un prototipo funcional. Para ello se diseña y construye tanto la estructura como la electrónica que consigue la movilidad del vehículo.Departamento de Tecnología ElectrónicaGrado en Ingeniería en Electrónica Industrial y Automátic

Nanopower CMOS transponders for UHF and microwave RFID systems

At first, we present an analysis and a discussion of the design options and tradeoffs for a passive microwave transponder. We derive a set of criteria for the optimization of the voltage multiplier, the power matching network and the backscatter modulator in order to optimize the operating range. In order to match the strictly power requirements, the communication protocol between transponder and reader has been chosen in a convenient way, in order to make the architecture of the passive transponder very simple and then ultra-low-power. From the circuital point of view, the digital section has been implemented in subthreshold CMOS logic with very low supply voltage and clock frequency. We present different solutions to supply power to the transponder, in order to keep the power consumption in the deep sub-µW regime and to drastically reduce the huge sensitivity of the subthreshold logic to temperature and process variations. Moreover, a low-voltage and low-power EEPROM in a standard CMOS process has been implemented. Finally, we have presented the implementation of the entire passive transponder, operating in the UHF or microwave frequency range