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In this work a new transistor topology for frequency multiplication is developed, achieving relative bandwidths of complex and balanced structures with only four transistors. It enables the highest bandwidth in active multiplication beyond 110 GHz. Cascading techniques are shown enabling a cascaded frequency multiplier by eight with a frequency range of 220 to 320 GHz. For the first time an active frequency multiplier by six reaches output frequencies up to 670 GHz.
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This work presents methods and techniques to optimize and implement distributed magnetic transformers for their application in matching networks of Monolithic Millimeter-wave Integrated Circuits (MMICs). It describes strategies for the efficiency and bandwidth optimization of the transformers and demonstrates their potential based on an optimized transformer geometry as well as two MMIC power amplifiers.
power amplifier --- Leistungsteiler --- Impedanztransformator --- power divider/combiner --- millimeter-wave --- Millimeterwellentechnik --- Leistungsverstärker --- Monolitische Integrierte Millimeterwellenschaltung (MMIC)Impedance transformer --- Monolithic Millimeter-wave Integrated Circuit (MMIC)
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Im Rahmen der vorliegenden Arbeit wurden monolithisch integrierte Millimeterwellenverstärker für den Einsatz in aktiven und passiven bildgebenden Systemen im Frequenzbereich der atmosphärischen Fenster bei 94 GHz, 140 GHz und 220 GHz entwickelt.Ziel ist eine umfassende Untersuchung geeigneter Schaltungskonzepte sowie der erfolgreiche Aufbau der koplanaren Sende- und Empfangsschaltkreise innerhalb von Millimeterwellenmodulen in Hohlleitertechnik.
Rauscharme Verstärker --- Modellierung --- Verbindungstechnik --- HEMT --- Subsystem --- Rauschen --- Kaskode-Schaltung --- MMIC --- Leistungsverstärker --- Rauscharme Verstärker --- Modellierung --- Verbindungstechnik --- HEMT --- Subsystem --- Rauschen --- Kaskode-Schaltung --- MMIC --- Leistungsverstärker
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This work has arisen out of the strong demand for a superior power-added efficiency (PAE) of AlGaN/GaN high electron mobility transistor (HEMT) high-power amplifiers (HPAs) that are part of any advanced wireless multifunctional RF-system with limited prime energy. Different concepts and approaches on device and design level for PAE improvements are analyzed, e.g. structural and layout changes of the GaN transistor and advanced circuit design techniques for PAE improvements of GaN HEMT HPAs.
MMIC design --- power amplifier --- AlGaN/GaN HEMT --- X-band --- power-added efficiency
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The aim of this work is the design of monolithic integrated power amplifiers for frequencies from 200 to 250 GHz and beyond. For this, reliable and flexible transmission line and transistor models are required. The models are created and their accuracy is verified up to 325 GHz. An innovative coupler concept is developed. It is tailor-made for the applied MMIC-technology and the frequency range. Based on this coupler, a novel amplifier topology has been established and applied.
power amplifier --- III-V semiconductor --- HEMT --- millimetre-wave --- koplanarer Wellenleiter --- monolithic integrated --- mHEMT --- Verbindungshalbleiter --- Mikrostreifenleitung --- coplanar waveguide --- FETmillimeterwave --- Terahertz --- microstrip transmission line --- 3-5 --- MMIC --- Leistungsverstärker --- Millimeterwelle
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Microwave circuits --- Microwave integrated circuits --- Strip transmission lines --- 621.3'7 --- Microstrip --- Strip conductors --- Striplines --- Transmission lines, Strip --- Microwaves --- Multiconductor transmission lines --- Telecommunication lines --- Integrated circuits --- Circuits, Microwave --- Electronic circuits --- Microwave devices --- 621.3'7 Electrical engineering--?'7 --- Electrical engineering--?'7 --- Electronics --- Telecommunication technology --- MMIC (microwave integrated circuits) --- transmissiesystemen
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This Special Issue focuses on the state-of-the-art results from the definition and design of filters for low- and high-frequency applications and systems. Different technologies and solutions are commonly adopted for filter definition, from electrical to electromechanical and mechanical solutions, from passive to active devices, and from hybrid to integrated designs. Aspects related to both theoretical and experimental research in filter design, CAD modeling and novel technologies and applications, as well as filter fabrication, characterization and testing, are covered. The proposed research articles deal with different topics as follows: Modeling, design and simulation of filters; Processes and fabrication technologies for filters; Automated characterization and test of filters; Voltage and current mode filters; Integrated and discrete filters; Passive and active filters; Variable filters, characterization and tunability.
History of engineering & technology --- analogue-to-digital conversion --- ATHOS soft X-ray beamline --- broadband noise --- Hall probe --- offset fluctuation and drift --- three-axis teslameter --- undulator --- power line communication (PLC) --- conducted disturbances --- anti-interference filter --- smart home --- low-pass filter (LPF) --- stepped impedance resonator (SIR) --- hairpin resonator --- internal coupling --- defected ground structure (DGS) --- current mode --- universal filter --- VCII --- voltage conveyor --- SIMO filter --- microwave dielectric ceramics --- filter --- additive manufacturing --- digital light processing --- post annealing --- dielectric properties --- wideband --- bandpass filter --- quarter wavelength --- stepped-impedance resonator (SIR) --- ultra-wideband --- stub-loaded --- stepped impedance resonator --- active filters --- anti-aliasing filters --- HBT --- inductorless --- low-pass filters --- SiGe --- switched-capacitor filters --- low-voltage --- finFET --- operational amplifier --- voltage-controlled oscillator --- unity-gain bandwidth --- varactor --- total harmonic distortion --- phase noise --- active inductor --- MMIC --- tunable filters --- analogue-to-digital conversion --- ATHOS soft X-ray beamline --- broadband noise --- Hall probe --- offset fluctuation and drift --- three-axis teslameter --- undulator --- power line communication (PLC) --- conducted disturbances --- anti-interference filter --- smart home --- low-pass filter (LPF) --- stepped impedance resonator (SIR) --- hairpin resonator --- internal coupling --- defected ground structure (DGS) --- current mode --- universal filter --- VCII --- voltage conveyor --- SIMO filter --- microwave dielectric ceramics --- filter --- additive manufacturing --- digital light processing --- post annealing --- dielectric properties --- wideband --- bandpass filter --- quarter wavelength --- stepped-impedance resonator (SIR) --- ultra-wideband --- stub-loaded --- stepped impedance resonator --- active filters --- anti-aliasing filters --- HBT --- inductorless --- low-pass filters --- SiGe --- switched-capacitor filters --- low-voltage --- finFET --- operational amplifier --- voltage-controlled oscillator --- unity-gain bandwidth --- varactor --- total harmonic distortion --- phase noise --- active inductor --- MMIC --- tunable filters
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This Special Issue focuses on the state-of-the-art results from the definition and design of filters for low- and high-frequency applications and systems. Different technologies and solutions are commonly adopted for filter definition, from electrical to electromechanical and mechanical solutions, from passive to active devices, and from hybrid to integrated designs. Aspects related to both theoretical and experimental research in filter design, CAD modeling and novel technologies and applications, as well as filter fabrication, characterization and testing, are covered. The proposed research articles deal with different topics as follows: Modeling, design and simulation of filters; Processes and fabrication technologies for filters; Automated characterization and test of filters; Voltage and current mode filters; Integrated and discrete filters; Passive and active filters; Variable filters, characterization and tunability.
History of engineering & technology --- analogue-to-digital conversion --- ATHOS soft X-ray beamline --- broadband noise --- Hall probe --- offset fluctuation and drift --- three-axis teslameter --- undulator --- power line communication (PLC) --- conducted disturbances --- anti-interference filter --- smart home --- low-pass filter (LPF) --- stepped impedance resonator (SIR) --- hairpin resonator --- internal coupling --- defected ground structure (DGS) --- current mode --- universal filter --- VCII --- voltage conveyor --- SIMO filter --- microwave dielectric ceramics --- filter --- additive manufacturing --- digital light processing --- post annealing --- dielectric properties --- wideband --- bandpass filter --- quarter wavelength --- stepped-impedance resonator (SIR) --- ultra-wideband --- stub-loaded --- stepped impedance resonator --- active filters --- anti-aliasing filters --- HBT --- inductorless --- low-pass filters --- SiGe --- switched-capacitor filters --- low-voltage --- finFET --- operational amplifier --- voltage-controlled oscillator --- unity-gain bandwidth --- varactor --- total harmonic distortion --- phase noise --- active inductor --- MMIC --- tunable filters
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This Special Issue focuses on the state-of-the-art results from the definition and design of filters for low- and high-frequency applications and systems. Different technologies and solutions are commonly adopted for filter definition, from electrical to electromechanical and mechanical solutions, from passive to active devices, and from hybrid to integrated designs. Aspects related to both theoretical and experimental research in filter design, CAD modeling and novel technologies and applications, as well as filter fabrication, characterization and testing, are covered. The proposed research articles deal with different topics as follows: Modeling, design and simulation of filters; Processes and fabrication technologies for filters; Automated characterization and test of filters; Voltage and current mode filters; Integrated and discrete filters; Passive and active filters; Variable filters, characterization and tunability.
analogue-to-digital conversion --- ATHOS soft X-ray beamline --- broadband noise --- Hall probe --- offset fluctuation and drift --- three-axis teslameter --- undulator --- power line communication (PLC) --- conducted disturbances --- anti-interference filter --- smart home --- low-pass filter (LPF) --- stepped impedance resonator (SIR) --- hairpin resonator --- internal coupling --- defected ground structure (DGS) --- current mode --- universal filter --- VCII --- voltage conveyor --- SIMO filter --- microwave dielectric ceramics --- filter --- additive manufacturing --- digital light processing --- post annealing --- dielectric properties --- wideband --- bandpass filter --- quarter wavelength --- stepped-impedance resonator (SIR) --- ultra-wideband --- stub-loaded --- stepped impedance resonator --- active filters --- anti-aliasing filters --- HBT --- inductorless --- low-pass filters --- SiGe --- switched-capacitor filters --- low-voltage --- finFET --- operational amplifier --- voltage-controlled oscillator --- unity-gain bandwidth --- varactor --- total harmonic distortion --- phase noise --- active inductor --- MMIC --- tunable filters
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Due to the ever-expanding applications of micro/nano-electromechanical systems (NEMS/MEMS) as sensors and actuators, interest in their development has rapidly expanded over the past decade. Encompassing various excitation and readout schemes, the MEMS/NEMS devices transduce physical parameter changes, such as temperature, mass or stress, caused by changes in desired measurands, to electrical signals that can be further processed. Some common examples of NEMS/MEMS sensors include pressure sensors, accelerometers, magnetic field sensors, microphones, radiation sensors, and particulate matter sensors. Despite a long history of development, fabrication of novel MEMS/NEMS devices still poses unique challenges due to their requirement for a suspended geometry; and many new fabrication techniques have been proposed to overcome these challenges. However, further development of these techniques is still necessary, as newer materials such as compound semiconductors, and 2-dimensional materials are finding their way in various MEMS/NEMS applications, with more complex structures and potentially smaller dimensions.
vibrating ring gyroscope --- n/a --- tunnel magnetoresistive effect --- optical sensor --- micro-NIR spectrometer --- pulse inertia force --- gas sensor --- wet etching --- oil detection --- glass welding --- spring design --- power consumption --- MEMS (micro-electro-mechanical system) --- back cavity --- deflection position detector --- magnetic --- MEMS --- single-layer SiO2 --- frequency tuning --- threshold accuracy --- suspended micro hotplate --- AlGaN/GaN circular HFETs --- quadrature modulation signal --- inertial switch --- nanoparticle sensor --- low noise --- photonic crystal nanobeam cavity --- floating slug --- infrared image --- backstepping approach --- microdroplet --- acceleration switch --- microgyroscope --- temperature uniformity --- methane --- microfluidic --- accelerometer design --- photonic crystal cavity --- anisotropy --- resonant frequency --- dual-mass MEMS gyroscope --- analytical model --- single crystal silicon --- temperature sensor --- micro fluidic --- refractive index sensor --- microwave measurement --- low zero-g offset --- femtosecond laser --- micropellistor --- rapid fabrication --- accelerometer --- tracking performance --- GaN diaphragm --- microactuator --- resistance parameter --- optomechanical sensor --- scanning grating mirror --- GaAs MMIC --- adaptive control --- frequency split --- frequency mismatch --- electrostatic force feedback --- thermoelectric power sensor --- squeeze-film damping --- silicon --- wideband --- Accelerometer readout --- bonding strength --- high temperature pressure sensors --- 3D simulation --- level-set method --- tetramethylammonium hydroxide (TMAH)
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