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 15 of 15 for “"intermodulation distortion"”.
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Intermodulation distortion in a broad band balanced mixer.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1969. M.S.
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Verification of d-wave pairing symmetry by microwave intermodulation distortion measurements in yttrium barium copper oxide
… and power dependence of the microwave frequency intermodulation distortion (IMD) in high quality pulsed laser deposition (PLD) Yttrium Barium Copper Oxide (YBCO) on LaAlO3 substrate. A low-temperature (T < 30 K) increase in IMD is the observation of an upturn of the nonlinear coefficient of the …
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A new approach to dynamic range enhancement
… examines the causes and characteristics of distortion introduced by the optical fiber link and describes and compares the performance of the DRET with other dynamic range enhancing techniques using computer simulation. In most instances, the DRET is shown to be superior both in reducing …
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Superconducting RF front-end filters for cell phone base stations
… to reject any unnecessary signals, eliminating intermodulation distortion (IMD). Broader geographical coverage and higher calling capacity per tower are other effects of the superconducting filters compared to their dielectric counterparts. Were a business to sell these filters, the intended …
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Study of nonlinear microwave properties of high-temperature superconducting film
… third-harmonic generation, and the third-order intermodulation distortion of engineeried bicrystal grain boundaries with misorientation angles of [theta] = 2⁰, 5⁰, 7.5⁰, 10⁰, and 24⁰ were measured using a suspended microstrip resonator with temperature ranging from 5 to 75 K.
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Design and analysis of pattern null reconfigurable antennas
… While various authors perform two tone intermodulation distortion (IMD) measurements when characterizing reconfigurable antenna performance, an analysis of the relationship between diode linearity and fundamental antenna parameters has yet to be conducted. This dissertation addresses …
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Constant Conduction Angle Biasing for Class C Monolithic RF Power Amplifiers
… how to achieve linearity and low third-order intermodulation distortion. Additionally, the methods utilize open-loop implementations.</p> <p>This work presents a novel dynamic biasing topology that results in a much improved linear class C PA. The topology utilizes a closed loop that cleverly …
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Modelling the human cochlea
… with increasing stimulus level, harmonic and intermodulation distortion, limit cycle oscillations that travel along the cochlear membranes, and the mutual suppression of nearby linear instabilities.
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A Distortion Suppression Technique for a Digital Class D Audio Power Amplifier with Pulse Density Modulation
… in lower EMI than PWM. In this thesis, a novel distortion suppression technique suitable for digital class D audio power amplifiers using pulse density modulation (DSM) is presented. The distortion suppression circuit generates a digital measurement of the output stage error, and feeds it back …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
… this will affect the system performance due to intermodulation products, and cross-modulation, to name a few. Intermodulation products are the result of adjacent channel signals that combine and create intermodulation distortion of the received signal. We call these adjacent channel signals …
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Linearity Enhancement of High Power GaN HEMT Amplifier Circuits
… to the cancellation of the IMD3 (Third-order Intermodulation Distortion) components at the output of the FETs and hence higher linearity performance. This technique has been demonstrated in Silicon technology but has not been previously implemented in GaN. This research work presents for the …
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Micromachined Components for RF Systems
… enables a low-loss conductor device; a reduced intermodulation distortion (IMD) device; and a compact tunable LC module. A single-finger capacitor having a low-loss conductor with an electrode gap of 1.2um and an electrode thickness of 2.2um has been fabricated using a reverse-side exposure …
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Linearization of RF Power Amplifiers
… power amplifier. This reduces amplifier distortion to acceptable levels and enables the transmission of RF signals utilizing spectrally efficient linear modulation schemes with a lower consumption of DC power. Results from constructing experimental hardware shows an intermodulation …
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Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios
… presented in this thesis focuses on diode predistortion linearization, particularly for PA RFICs in digital radios. Background discussion on common linearization techniques available to the PA designer is presented. In addition, a discussion of traditional and modern methods of nonlinearity …
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Efficiency Improvement of WCDMA Base Station Transmitters using Class-F power amplifiers
Universal Mobile Telecommunications Systems (UMTS) is the preferred third generation (3G) communication standard for mobile communications and will provide worldwide coverage, a convenient software technology and very high data rate. The high data rate, especially, requires the use of …