Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"load-pull"”.
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Broadband, low-noise and power microwave amplifiers
… by comparing it to the measured data. Source-Pull and Load-Pull measurements were performed for the Power GaAs FET characterisation. The noise-parameter device characterisation is carried out in a similar way to that for Load-Pull data. Each amplifier required final tuning adjustments in order …
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Dynamic range characterization of indium-phosphide double-heterojunction bipolar transistors for ultralinear sub-millimeter wave applications
… along with a novel procedure for calibrating load-pull measurements using all on-chip calibration standards. The use of all on-chip calibration standards can reduce potential calibration errors caused by cable movement. Also detailed are the suspected physical origins of nonlinearity in Type-I …
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Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source
… microwave impedance was measured by using the load-pull technique. Also, the device was characterized in terms of output power, frequency and linewidth. The output frequency of the generated signal was 5GHz with a linewidth <2MHz. The output power that was extracted was as high as -6dBm without …
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Large-signal characterization and modeling of nonlinear devices using scattering parameters
… drive conditions. The model is used to simulate load-pull data for various drive levels which are compared to measured data.
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Enabling and directing real-time cognitive radar transmitter optimization.
… using a software-defined radio (SDR) and a load-pull extrapolation method using deep learning image completion techniques. Additionally, the accelerated optimization technique has been adapted for use with the pulse-to-pulse waveform agility paradigm of cognitive radars. Finally, the impact …
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S-parameter modeling of two-port devices using a single, memoryless nonlinearity
… transmission line approach to calibration with a load-pull process common to nonlinear device measurements. A two-port, one-way measurement process obviates the need for DUT reversal. The calibrated measurement of input reflection, transmission, and load reflection is discussed. In addition, the …
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VHF bipolar transistor power amplifiers: measurement, modeling, and design
… S-parameter measurement technique and the "load-pull" procedure. Practical considerations such as amplifier stability, bias network design, and matching network topology are also included in the report.
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Design and Linearization of Energy Efficiency Power Amplifier in Nonlinear OFDM Transmitter for LTE-5G Applications. Simulation and measurements of energy efficiency power amplifier in the presence of nonlinear OFDM transmitter system and digital predistortion based on Hammerstein-Wiener method
… components of class F RF power amplifier using a load-pull approach to realise an optimum load impedance and the matching network is presented. The frequency bandwidth for both amplifiers was allocated to operate in the 2.620-2.690 GHz of mobile LTE applications. The second part explores the …
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Design of Class-E Radio Frequency Power Amplifier
… (A, AB, B, C, F, E, etc), and design techniques (Load-pull and large-signal S-parameters techniques) are presented. The design accuracy of class-A power amplifier based on the small-signal S-parameters was investigated, where compression in the power gain was used as an indicator for design …
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Modeling gallium-nitride based high electron Mobility transistors : linking device physics to high voltage and high frequency circuit design
… large-signal switching characteristics, load-pull, source-pull and power-sweep, inter-modulation-distortion and noise-figure of both HV- and RF-devices. The thesis also aims to tie device-physics concepts of carrier transport and charge distribution in GaN HEMTs to circuit-design through …
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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… in conventional stacked power amplifiers or load-pull based inter-stage matching technique, rather than conventional conjugate matching, have been applied to W-band CMOS and SiGe BiCMOS amplifiers to improve power efficiency with 5-10 dBm output power level, suitable for a large phased array …