Sökning: "noise figure"

Visar resultat 1 - 5 av 50 avhandlingar innehållade orden noise figure.

  1. 1. Experimentally Based HFET Modeling for Microwave and Millimeter Wave Applications

    Författare :Mikael Garcia; Chalmers University of Technology; []
    Nyckelord :MODFET; soft-breakdown; cold FET; large-signal; source balance; SDHT; dispersion; noise figure; temperature noise model; small-signal; TEGFET; direct extraction; Chalmers model; noise parameters; modeling; HEMT; HFET; noise;

    Sammanfattning : Transistor models are very important in the design of Monolithic Microwave Integrated Circuits (MMICs). Circuit simulations based on accurate transistor models are one of the keys to high circuit yield. Transistor models can also be used to trace problems in the device fabrication processes. LÄS MER

  2. 2. Noise and Saturation Properties of Fiber Optical

    Författare :Per Kylemark; Chalmers University of Technology; []
    Nyckelord :nonlinear fiber optics; four-wave mixing; single-pumped; regeneration; saturation; dual-pumped; noise figure; parametric amplification;

    Sammanfattning : Fiber Optical Parametric Amplifiers (FOPAs) are based on a highly efficient Four-wave Mixing process in highly nonlinearfibers and have gained a lot of interest since it was shown that ahigh gain can be obtained. They are multi-functional devices thatare not only limited to amplifying signals, but their wide range ofapplicability also include wavelength conversion, pulse-generation,optical sampling and also regeneration at very high bit-rates. LÄS MER

  3. 3. RF and Noise Optimization of Pseudomorphic inP HEMT Technology

    Författare :Mikael Malmkvist; Chalmers University of Technology; []
    Nyckelord :fabrication; high electron mobility transistor HEMT ; optimization; Schottky layer; InAlAs; Indium phosphide InP ; MMIC.; noise; pseudomorphic; modeling; InGaAs;

    Sammanfattning : The InGaAs-InAlAs-InP high electron mobility transistor (InP HEMT) is the electronic device utilized for the highest frequency and/or the lowest noise applications known to date for analog transistor-based circuits. Hence it is of both scientific and technological interest to explore the InP HEMT for even further improvement in device performance. LÄS MER

  4. 4. Ultralow noise pre-amplified receiver for free-space optical communications

    Författare :Ravikiran Kakarla; Chalmers University of Technology; []
    Nyckelord :Phase sensitive amplifier; noise figure; optical injection locking; sensitivity;

    Sammanfattning : The demand for high data rate in space communication links is increasing due to the growth of space exploration missions inter-satellite, and satellite-to-Earth data transmission. Optical communication systems capable of handling hundreds of Gigabits per second data transmission with a single light carrier and are suitable for such space links. LÄS MER

  5. 5. Optimum GaN HEMT Oscillator Design Targeting Low Phase Noise

    Författare :Mikael Hörberg; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; low frequency noise; resonator coupling; cavity resonator; GaN HEMT; MMIC; reflection oscillator; phase noise;

    Sammanfattning : The thesis considers design of low phase noise oscillators, given the boundary condition of the used technology. Important conditions are the power handling of the active device, device noise floor, the quality factor of the resonator, bias settings, and low frequency noise. LÄS MER