A DC to 40 GHz, high linearity monolithic GaAs distributed amplifier with low DC power consumption as a high bit-rate pre-driver

This paper presents the design and the performance of a six stage GaAs MMIC distributed amplifier (DA) for optical driver applications. The DA is fabricated in a commercially available 0.15 μm GaAs p-HEMT technology. The amplifier exhibits 13 dB of small gain over 40 GHz of 3 dB bandwidth with a power consumption equal to 550 mW. Group delay time variation up to 30 GHz is only ±7 ps. The output power is higher than 16 dBm (4 V pp ), which makes the circuit suitable as a preamplifier for lithium-niobate (LiNb03) optical modulator driver. The DA is demonstrated as a part of the modulator driver in a 12.5 GBps PAM-4 (25Gbps) optical system by using the eye diagram as a figure of merit.This work was supported in part by the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (ERDF/FEDER) under research projects TEC2014-60283-C3-1-R and TEC2017-88242-C3-1-R, and in part by the French company Vectrawave through the project SOPA (Support On Power Amplifier design)

Introduction

In recent years, a considerable amount of effort has been devoted, both in industry and academia, to improving maintenance. Time is a critical factor in maintenance, and efforts are placed to monitor, analyze, and visualize machine or asset data in order to anticipate to any possible failure, prevent damage, and save costs. The MANTIS Book aims to highlight the underpinning fundamentals of Condition-Based Maintenance related conceptual ideas, an overall idea of preventive maintenance, the economic impact and technical solution. The core content of this book describes the outcome of the Cyber-Physical System based Proactive Collaborative Maintenance project, also known as MANTIS, and funded by EU ECSEL Joint Undertaking under Grant Agreement nº 662189. The ambition has been to support the creation of a maintenance-oriented reference architecture that support the maintenance data lifecycle, to enable the use of novel kinds of maintenance strategies for industrial machinery. The key enabler has been the fine blend of collecting data through Cyber-Physical Systems, and the usage of machine learning techniques and advanced visualization for the enhanced monitoring of the machines. Topics discussed include, in the context of maintenance: Cyber-Physical Systems, Communication Middleware, Machine Learning, Advanced Visualization, Business Models, Future Trends. An important focus of the book is the application of the techniques in real world context, and in fact all the work is driven by the pilots, all of them centered on real machines and factories. This book is suitable for industrial and maintenance managers that want to implement a new strategy for maintenance in their companies. It should give readers a basic idea on the first steps to implementing a maintenance-oriented platform or information system.info:eu-repo/semantics/publishedVersio

Methodological contribution to the practical aspects of the design, simulation and measurement of monolithic microwave integrated power amplifiers in gallium nitride technology

RESUMEN: Las comunicaciones actuales demandan sistemas con dispositivos activos de prestaciones punteras por encima de las tecnologías monolíticas establecidas, a un coste razonable y complejidad circuital limitada. Esta tesis se centra en el diseño, simulación electromagnética y medida de amplificadores integrados monolíticos de alta potencia y alta frecuencia en tecnología de nitruro de galio. Se han diseñado dos amplificadores monolíticos, cuyos desarrollos se han utilizado como base para razonar la correcta configuración que ha de aplicarse en la simulación electromagnética de su layout. También se presenta un procedimiento estructurado para la construcción y simulación de layouts de circuitos integrados complejos con una alta confiabilidad en los resultados. Finalmente, se han realizado montajes de medida para los circuitos monolíticos fabricados, abordando adecuadamente la gestión térmica de los amplificadores de potencia de alta frecuencia en nitruro de galio. En los resultados se alcanzan 18dB de ganancia entre 1 y 39GHz con una planitud de 3dB, una adaptación en entrada y salida adecuada a 50ohm para todo el rango de funcionamiento y una potencia de salida en saturación superior a 32dBm desde 1 hasta 37GHz. La bibliografía consultada ha consistido en artículos técnicos revisados por pares, así como bibliografía técnica especializada en amplificadores monolíticos de microondas.ABSTRACT: Today's communications needs demand systems made of active devices with leading-edge performance over established monolithic technologies, at a reasonable cost and limited circuit complexity. This thesis focuses on the design, electromagnetic simulation and measurement of high-power, high-frequency monolithic integrated amplifiers in gallium nitride technology. Two monolithic amplifiers have been designed, who have been used as a basis for reasoning the correct configuration to be applied in the electromagnetic simulation of their layout. A structured procedure for the construction and simulation of complex integrated circuit layouts with high reliability in the results is also presented. Finally, test fixtures for both fabricated monolithic circuits are presented, which correctly address the thermal management of the high-frequency gallium nitride power amplifiers. Output results show a gain of 18Db with a 3dB ripple from 1 to 39GHz, an adequate input and output impedance match to 50 ohm and an saturated output power level higher than 32dBm from 1 to 37GHz. Consulted bibliography consisted on peer reviewed technical papers, as well as specialiced publications on the field of the microwave monolithic amplifiers