Search for dissertations about: "amplifier vector"

Showing result 1 - 5 of 8 swedish dissertations containing the words amplifier vector.

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

    Author : Olle Nyström; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vector measurements; mm- and submm-wave optics; LNA; radio astronomy; cryogenic amplifier; APEX; InP HEMT; Gaussian beam;

    Abstract : 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. READ MORE

  4. 2. Characterization and Applications of Vector Phase-Sensitive Amplifiers

    Author : Abel Lorences Riesgo; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; parametric amplification; phase-sensitive amplification; fiber nonlinearities; four-wave mixing; all-optical processing;

    Abstract : This work is devoted to the characterization of vector phase-sensitive amplifiers and processors. A detailed analysis of degenerate vector phase-sensitive amplifier (PSA) is performed.The gain and phase-sensitive extinction ratio are theoretically analyzed using three-wave theory. READ MORE

  5. 3. Large-Signal Modeling of Microwave Transistors

    Author : Lars Bengtsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; large-signal; HEMT; non-linear models; de-embedding; high-efficiency; class-E amplifier; LDMOS; HBT; HFET; model parameter extraction; microwave transistors;

    Abstract : The development of computer aided design tools for microwave circuit design has increased the interest for accurate transistor models. The circuit complexity has grown as the CAD tools have been improved and the need to predict how non-linear circuits behave has also been increased. READ MORE

  6. 4. Molecular and cellular strategies to enhance efficacy of T cell-based cancer therapy

    Author : Pascal Dammeyer; Karolinska Institutet; Karolinska Institutet; []
    Keywords : β2-microglobulin; MHC class I antigen defects; immune escape; heal-inducible; amplifier vector; GM-CSF; tumor immunity; T lymphocytes;

    Abstract : A combined approach of vaccination with β2-microglobulin (β2m)-deficient dendritic cells (DCs) and granulocyte-macrophage colony-stimulating factor (GM-CSF) as a potent adjuvant may link cellular and molecular strategies to further enhance anti-tumor T-cell responses. T lymphocytes can mediate a potent anti-tumor immune response. READ MORE

  7. 5. Phase-Sensitive Parametric Signal Processing in Optical Communications

    Author : Abel Lorences Riesgo; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : This thesis covers the analysis of several schemes for parametric processing in fiberoptic communication systems, focusing mainly on phase-sensitive processing. Vector phase-sensitive amplifiers are characterized and phase regeneration of a dualpolarization (DP)-binary phase-shift keying signal (BPSK) signal is experimentally demonstrated. READ MORE