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 7 of 7 for “"Q-Enhancement"”.
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Acoustic Bragg reflectors for Q-enhancement of unreleased MEMS resonators
… for energy localization and quality factor (Q)- enhancement for unreleased resonators. Two of the greatest challenges in MEMS are those of packaging and integration with CMOS technology. Development of unreleased MEMS resonators at the transistor level of the CMOS stack will enable direct …
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Optimization and design of radio frequency piezoelectric MEMS resonators
… spurious modes suppression, quality factor (Q) enhancement, frequency scalability, and electromechanical coupling improvement. These issues obstruct the wide deployment and commercialization of AlN Lamb mode resonators. This dissertation presents comprehensive investigations and solutions to …
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A dual-mode Q-enhanced RF front-end filter for 5 GHz WLAN and UWB with NB interference rejection
… design utilizes high Q passive devices and Q-enhancement technique to provide front-end channel-selection in NB mode and NB interference rejection in UWB mode. In the 802.11a NB mode, the filter has a tunable gain of 4 dB to 25 dB, NF of 8 dB and an IIP3 between -47 dBm and -18 dBm. The input …
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High Frequency Thermally Actuated Single Crystalline Silicon Micromechanical Resonators with Piezoresistive Readout
… Therefore, such resonators can provide self-Q-enhancement and self-sustained-oscillation without the need for any electronic circuitry. In this research these facts have been shown both experimentally and theoretically. In addition, in order to further simplify the fabrication process of such …
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Tunable Filters and Interference Rejection System for Interferer Suppression at RF and Microwave Bands
… active notch filter system comprised of a Q-enhancement band-pass filter (BPF) and an all-pass amplifier. The notch response is synthesized by subtracting the BPF output from the all-pass output. In the proposed synthetic notch filters, the BPF is responsible for defining selectivity while …
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Q-Enhanced LC Resonators for Monolithic, Low-Loss Filters in Gallium Arsenide Technology
… The first phase of this work focused on the Q-enhancement of LC resonator structures using FET-based active negative resistance circuits. Three passive resonators were designed, fabricated, and measured to determine their loss and frequency response. Furthermore, six Q-enhanced resonators were …
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Design of Integrated, Low Power, Radio Receivers in BiCMOS Technologies
… the necessary on-chip spiral inductors and Q-enhancement circuits, predicting frequency and Q tolerances and temperature stability, and developing real-time frequency and Q tuning mechanisms. These issues are studied in depth and two prototype filters designed to validate theoretical …