Sökning: "low noise amplifier"

Visar resultat 16 - 20 av 70 avhandlingar innehållade orden low noise amplifier.

  1. 16. Design Aspects of Fully Integrated Multiband Multistandard Front-End Receivers

    Författare :Adiseno; KTH; []
    Nyckelord :low-noise amplifier; mixer; RF front-end; wireless receiver; noise figure; linearity; bandwidth; dual-loop feedback;

    Sammanfattning : In this thesis, design aspects of fully integrated multibandmultistandard front-end receivers are investigated based onthree fundamental aspects: noise, linearity and operatingfrequency. System level studies were carried out to investigatethe effects of different modulation techniques, duplexing andmultiple access methods on the noise, linearity and selectivityperformance of the circuit. LÄS MER

  2. 17. THz Vector Beam Measurement System for APEX Instrument SHeFI and Microwave Cryogenic Low Noise Amplifier Design

    Författare :Olle Nyström; Chalmers University of Technology; []
    Nyckelord :vector measurements; mm- and submm-wave optics; LNA; radio astronomy; cryogenic amplifier; APEX; InP HEMT; Gaussian beam;

    Sammanfattning : This licentiate thesis describes results of the author’s work on development of THz vector beam measurement system and microwave cryogenic low-noise amplifier.The first part, and the main focus, of the thesis covers the vector beam measurement system for frequency range 210-500 GHz developed to characterize/verify the cold opticsof the APEX instrument SHeFI. LÄS MER

  3. 18. InP High Electron Mobility Transistor Design for Cryogenic Low Noise Amplifiers

    Författare :Eunjung Cha; Chalmers University of Technology; []
    Nyckelord :cryogenic; stability; noise temperature; InP HEMT; LNA; MMIC;

    Sammanfattning : The InGaAs/InAlAs/InP high electron mobility transistor (InP HEMT) is the superior technology for the most demanding low-noise and high-speed microwave and millimeter-wave applications, in particular in radio astronomy and deep-space communication. InP HEMT has enabled cryogenic low noise amplifier (LNA) designs with noise temperatures about ten times the quantum noise limit from sub  GHz up to 120 GHz. LÄS MER

  4. 19. 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. 20. Ultra-Low Noise InP HEMTs for Cryogenic Amplification

    Författare :Joel Schleeh; Chalmers University of Technology; []

    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