Search for dissertations about: "GaAs mHEMT"

Showing result 1 - 5 of 10 swedish dissertations containing the words GaAs mHEMT.

  1. 1. 60 GHz Mixer and Multifunctional MMICs in GaAs pHEMT and mHEMT technologies

    University dissertation from Chalmers University of Technology

    Author : Sten E. Gunnarsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; 60 GHz; Balanced resistive mixer; Broadband wireless communication; Double balanced Gilbert mixer; Dual-quadrature mixer; GaAs; High data-rate; Image reject mixer; mHEMT; Mixer; MMIC; Multifunctional; pHEMT; Receiver; Single-chip; Transmitter; V-band;

    Abstract : In recent years, the 60 GHz band has gained increased academic and commercial interest mainly due to the relative large amount of license free and little used frequency spectrum located in vicinity of 60 GHz. The exact locations of these free frequency bands varies locally but the 59–62 GHz band overlap around the world and is therefore a true world wide license free band. READ MORE

  2. 2. Microwave and Millimeter-Wave Monolithic Integrated Circuits in CMOS and GaAs-mHEMT Technologies

    University dissertation from Chalmers University of Technology

    Author : Bahar M. Motlagh; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; 60 GHz; 210 GHz; 90 nm CMOS technology; 100 nm mHEMT technology; antenna integration; balun; capacitor; CMOS integrated circuits; double-slot antenna; GaAs-mHEMT; microstrip line; millimeter-wave; MMIC; noise measurement; power divider; resistive mixer; single-balanced; single-ended;

    Abstract : The objective of this work has been to design and characterize microwave and millimeter-wave components and circuits within a 90 nm Si-CMOS process and a 100 nm GaAs-mHEMT process. The work is divided in two parts depending on the technology. READ MORE

  3. 3. Integrated VCOs in Gallium Arsenide HEMT technologies with a novel varactor structure

    University dissertation from Chalmers University of Technology

    Author : Mattias Ferndahl; Chalmers tekniska högskola.; Chalmers University of Technology.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; VCO; Oscillator; HEMT; GaAs; MMIC; design; varactor; mHEMT; pHEMT;

    Abstract : This thesis presents results on metamorphic and pseudomorpic GaAs HEMT based Voltage Controlled Oscillators and a novel high-Q varactor structure, used in the VCOs, together with a straightforward extraction procedure for the varactors. Theory and fundamentals around LC-oscillators with oscillator criteria, phase noise and different topologies are given as background together with VCO phase noise measurement methods and an overview on device flicker noise; its physical origin and measurement. READ MORE

  4. 4. Millimeter and Sub-Millimeter Wave Integrated Active Frequency Down-Converters

    University dissertation from Chalmers University of Technology

    Author : Yu Yan; Chalmers tekniska högskola.; Chalmers University of Technology.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; millimeter wave; sub-millimeter wave; THz; 145 GHz; 220 GHz; 340 GHz; GaAs; mHEMT; InP; DHBT; SiGe; BiCMOS; monolithic; mixer; self-oscillating mixer; resistive mixer; Gilbert mixer; transconductance mixer; harmonic; conversion gain; noise figure; transceiver; FMCW; radar;

    Abstract : In recent years, the increasing amount of data transmission, the need for automotive radars, and standoff imaging for security applications are the main factors that accelerate research in the millimeter and sub-millimeter wave frequency ranges. The semiconductor industries have continuously developed their processes, which have opened up opportunities for manufacturing monolithically integrated circuits up to a few hundred GHz, based on transistor technologies. READ MORE

  5. 5. Mixers and Multifunctional MMICs for Millimeter-Wave Applications

    University dissertation from Chalmers University of Technology

    Author : Sten E. Gunnarsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektronik; Electronics; 53 GHz; 60 GHz; 220 GHz; balanced resistive mixer; broadband wireless communication; double-balanced Gilbert mixer; dual-quadrature mixer; drain mixer; G-band; GaAs; high data rate; image reject mixer; mHEMT; mixer; MMIC; multifunctional; pHEMT; radiometer; receiver; resistive mixer; single-chip; sub-harmonically pumped resistive mixer; transmitter; V-band.;

    Abstract : This thesis treats the design and characterization of different mixer and multifunctional monolithic microwave integrated circuits (MMICs) in GaAs pHEMT and mHEMT technologies. The MMICs operate at the V (50 – 75 GHz) and G (140 – 220 GHz) bands and several of them demonstrate state-of-the-art performance, level of integration, novel topologies, and/or novel functionality. READ MORE