Sökning: "Cryogenic"

Visar resultat 1 - 5 av 130 avhandlingar innehållade ordet Cryogenic.

  1. 1. Cryogenic low noise amplifiers for microwave frequencies

    Författare :Jianguo Xu; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MODFET; cryogenic; millimeter-wave; low-noise amplifier; FET noise model; microwave; TEGFET; HEMT; noise measurement; HFET; computer-aided design;

    Sammanfattning : .... LÄS MER

  3. 2. Ultra-Low Noise InP HEMTs for Cryogenic Amplification

    Författare :Joel Schleeh; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cryogenic; DC power dissipation; MMIC; LNA; InP HEMT; ALD;

    Sammanfattning : InGaAs/InAlAs/InP High Electron Mobility Transistors (InP HEMTs), are today the best devices to design cryogenic low noise amplifiers. However, reported progress in reducing the noise has been slow in the last decade. LÄS MER

  4. 3. InAs/AlSb HEMTs for Cryogenic Low-Noise Applications

    Författare :Giuseppe Moschetti; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cryogenic; metamorphic; high frequency; high electron mobility transistor HEMT ; low power; low noise.; InAs AlSb;

    Sammanfattning : The InAs/AlSb high electron mobility transistor (HEMT) is an emerging microwave device technology. The high electron mobility and high peak electron velocity of the InAs channel makes this device technology a potential candidate for low-noise applications operating at very low power dissipation. LÄS MER

  5. 4. Cryogenic Ultra-Low Noise InP High Electron Mobility Transistors

    Författare :Joel Schleeh; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MMIC; LNA; cryogenic; low noise; DC power dissipation; ALD; GaAs MHEMT; gain fluctuations; InP HEMT;

    Sammanfattning : Indium phosphide high electron mobility transistors (InP HEMTs), are today the best transistors for cryogenic low noise amplifiers at microwave frequencies. Record noise temperatures below 2 K using InP HEMT equipped cryogenic low noise amplifiers (LNAs) were demonstrated already a decade ago. LÄS MER

  7. 5. Cryogenic InP High Electron Mobility Transistors in a Magnetic Field

    Författare :Isabel Harrysson Rodrigues; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; magnetic field; cryogenic; low noise amplifier; angular dependence; InP HEMT; geometrical magnetoresistance;

    Sammanfattning : The InGaAs-InAlAs-InP high electron mobility transistor (InP HEMT) is the preferred active device used in a cryogenic low noise amplifier (LNA) for sensitive detection of microwave signals. In this thesis it is demonstrated that the InP HEMT, when placed in a magnetic field, has a strong angular dependence in its output current. LÄS MER