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dc.contributor.authorTurner, Nathan Isaacen_US
dc.date.accessioned2018-08-30T08:00:36Z
dc.date.available2018-08-30T08:00:36Z
dc.date.issued2018-08-29en_US
dc.identifier.othervt_gsexam:16829en_US
dc.identifier.urihttp://hdl.handle.net/10919/84935
dc.description.abstractAs the oil and gas industry continues to explore higher temperature environments, electronics that operate at those temperatures without additional cooling become critical. Additionally, current communications systems cannot support the higher data-rates being offered by advancements in sensor technology. An RF modem would be capable of supplying the necessary bandwidth to support the higher data-rate. A voltage-controlled oscillator is an essential part of an RF modem. This thesis presents a 2.336-2.402 GHz voltage-controlled oscillator constructed with 0.25 μm GaN-on-SiC technology high electron mobility transistor (HEMTs). The measured operating temperature range was from 25°C to 225°C. A minimum tuning range of 66 MHz, less than 20% variation in output power, and harmonics more than 20 dB down from the fundamental is observed. The phase noise is between -88 and -101 dBc/Hz at 100 kHz offset at 225°C. This is the highest frequency oscillator that operates simultaneously at high temperatures reported in literature.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis item is protected by copyright and/or related rights. Some uses of this item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjecthigh temperatureen_US
dc.subjectdownhole communicationen_US
dc.subjectGaN on SiCen_US
dc.subjectextreme environmenten_US
dc.subjectVCOen_US
dc.titleHigh Temperature Microwave Frequency Voltage-Controlled Oscillatoren_US
dc.typeThesisen_US
dc.contributor.departmentElectrical 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 Engineeringen_US
dc.contributor.committeechairHa, Dong Samen_US
dc.contributor.committeememberYi, Yangen_US
dc.contributor.committeememberBaumann, William T.en_US


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