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dc.contributor.authorMcCloskey, Edward Danielen_US
dc.date.accessioned2014-03-14T20:34:24Z
dc.date.available2014-03-14T20:34:24Z
dc.date.issued2001-04-19en_US
dc.identifier.otheretd-04272001-095623en_US
dc.identifier.urihttp://hdl.handle.net/10919/31959
dc.description.abstractThe rapid development of wireless applications has created a demand for low-cost, compact, low-power hardware solutions. This demand has driven efforts to realize fully integrated, "single-chip" systems. While substantial progress had been made in the integration of many RF and baseband processing elements through the development of new technologies and refinements of existing technologies, progress in the area of fully monolithic filters has been limited due to the losses (low Qs) associated with integrated passive elements in standard IC processes. The work in this thesis focuses on the development low-loss, Q-enhanced LC filters in GaAs E/D-SAGFET technology. This thesis presents a methodology for designing Q-enhanced LC resonators and low-loss, monolithic LC filters based on these resonators. 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 designed, fabricated, and measured to compare the performance of various negative resistance circuit designs. In the second phase of this work, four of these Q-enhanced resonator designs were used to implement fully-integrated second-order Butterworth bandpass filters. Each filter was designed for a 60 MHz, -3 dB bandwidth centered at 1.88 GHz, corresponding to the North American PCS transmit band. The best filter design achieves 0 dB of passband insertion loss while consuming 16 mA of current from a 3 V source (48 mW). Passband gain (up to 15 dB) can be achieved with increased bias current before instability is encountered. The filter provides more than 30 dB of rejection at 1.7 and 2 GHz and more than 70 dB of rejection below 1.5 GHz. In the filter passband, the noise figure is 12 dB and the output 1 dB compression point is -18 dBm. These Q-enhanced LC filters have potential application as image-reject filters in GaAs integrated transceiver designs.en_US
dc.publisherVirginia Techen_US
dc.relation.haspart1etd.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectQ-Enhancementen_US
dc.subjectGaAsen_US
dc.subjectFilteren_US
dc.subjectResonatorsen_US
dc.subjectNegative Resistanceen_US
dc.subjectIntegrated Circuiten_US
dc.subjectRFICen_US
dc.titleQ-Enhanced LC Resonators for Monolithic, Low-Loss Filters in Gallium Arsenide Technologyen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairRaman, Sanjayen_US
dc.contributor.committeememberBostian, Charles W.en_US
dc.contributor.committeememberStephenson, F. Williamen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04272001-095623/en_US
dc.date.sdate2001-04-27en_US
dc.date.rdate2002-04-27
dc.date.adate2001-04-27en_US


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