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5. High Temperature Microwave Frequency Voltage-Controlled Oscillator

Author

Turner, Nathan Isaac, Electrical Engineering, Ha, Dong Sam, Yi, Yang, and Baumann, William T.

Subjects
high temperature, GaN on SiC, extreme environment, VCO, downhole communication
Abstract

As 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. Master of Science The oil and gas industry require communications systems to transmit data collected from sensors in deep wells to the surface. However, the temperatures of these wells can be more than 210 °C. Traditional Silicon based circuits are unable to operate at these temperatures for a prolonged period. Advancements in wide bandgap (WBG) semiconductor devices enable entrance into this realm of high temperature electronics. One such WBG technology is Gallium Nitride (GaN) which offers simultaneous high temperature and high frequency performance. These properties make GaN an ideal technology for a high temperature RF modem. A voltage-controlled oscillator is an essential part of a RF modem. This thesis demonstrates a GaN-based 2.36 GHz voltage-controlled oscillator (VCO) whose performance has been measured over a temperature range of 25°C-225°C. This is the highest frequency oscillator that operates simultaneously at high temperatures reported in literature.

Published
2018

7. New hardware simplifies servodrive design

Author

Turner, Nathan C.

Subjects
Servoamplifiers -- Design and construction, Business, Engineering and manufacturing industries, Metals, metalworking and machinery industries
Abstract

Digital servoamplifiers make it easy to design and troubleshoot motion control systems by emulating servomotors and stepping motors with one set of hardware. Engineers who are able to quickly frame [...]

Published
1992

8. Far And Away

Author

Turner, Nathan

Subjects
Art consultants -- Travel -- Beliefs, opinions and attitudes, Designers -- Beliefs, opinions and attitudes -- Travel, Architecture and design industries, Home and garden
Abstract

Byline: NATHAN TURNER FAR AND AWAY AD special projects editor Nathan Turner reports on where the stylish set is headed this summer One of my favorite things about being a [...]

Published
2013

9. AT HOME ON THE RANGE.

Author

Turner, Nathan and Marcoux, Steele Thomas

Abstract

"It's as old as California gets", says Turner, of The Alisal's painterly landscape filled with wild yellow mustard grasses and lichen-strewn white oak trees. Turner designed the guest cottage to reflect its ranch surroundings, starting with the earthy paint palette he chose for each of the three bedrooms. FOR A TASTE of California's rich culinary traditions, join Turner at The Alisal for I LOVE CALIFORNIA!. [Extracted from the article]

Published
2019

10. Requirements analysis and course improvements for EO3502 telecommunications systems engineering

Author

Overton, David F., Broadston, Robert D., Boger, Dan C., Naval Postgraduate School, Information Sciences (IS), Turner, Nathan L., Wagner, Michael D., Overton, David F., Broadston, Robert D., Boger, Dan C., Naval Postgraduate School, Information Sciences (IS), Turner, Nathan L., and Wagner, Michael D.

Abstract

This thesis evaluated the requirement and provides course improvement recommendations forTelecommunications Systems Engineering EO3502 taught at the Naval Postgraduate School Other graduate programs in Information Technology Management were evaluated to determine the standard for telecommunications engineering expected from some of the most respected academic institutions. Graduates of NPS's Information Technology Management (ITM) and Information Systems andOperations (ISO) curriculums were surveyed to determine how important telecommunicationsengineering is for their follow-on assignments. In addition, lesson topic vignettes were developed toprovide fleet/field examples to reinforce the relevance if individual topics. Finally, recommendationswere provided for improving EO3502 and the ITM curriculum in general., http://archive.org/details/requirementsnaly109452260, Approved for public release; distribution is unlimited, Approved for public release; distribution is unlimited.

Published
2012

11. Requirements Analysis and Course Improvements for EO3502 Telecommunications Systems Engineering

Author

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATIONAL SCIENCES, Wagner, Michael D., Turner, Nathan L., NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATIONAL SCIENCES, Wagner, Michael D., and Turner, Nathan L.

Abstract

This thesis evaluated the requirement and provides course improvement recommendations for Telecommunications Systems Engineering EO3502 taught at the Naval Postgraduate School. Other graduate programs in Information Technology Management were evaluated to determine the standard for telecommunications engineering expected from some of the most respected academic institutions. Graduates of NPS's Information Technology Management (ITM) and Information Systems and Operations (ISO) curriculums were surveyed to determine how important telecommunications engineering is for their follow-on assignments. In addition, lesson topic vignettes were developed to provide fleet/field examples to reinforce the relevance if individual topics. Finally, recommendations were provided for improving EO3502 and the ITM curriculum in general., The original document contains color images.

Published
2005

12. Requirements analysis and course improvements for EO3502 telecommunications systems engineering

Author

Overton, David F., Broadston, Robert D., Boger, Dan C., Naval Postgraduate School, Information Sciences (IS), Turner, Nathan L., Wagner, Michael D., Overton, David F., Broadston, Robert D., Boger, Dan C., Naval Postgraduate School, Information Sciences (IS), Turner, Nathan L., and Wagner, Michael D.

Abstract

This thesis evaluated the requirement and provides course improvement recommendations forTelecommunications Systems Engineering EO3502 taught at the Naval Postgraduate School Other graduate programs in Information Technology Management were evaluated to determine the standard for telecommunications engineering expected from some of the most respected academic institutions. Graduates of NPS's Information Technology Management (ITM) and Information Systems andOperations (ISO) curriculums were surveyed to determine how important telecommunicationsengineering is for their follow-on assignments. In addition, lesson topic vignettes were developed toprovide fleet/field examples to reinforce the relevance if individual topics. Finally, recommendationswere provided for improving EO3502 and the ITM curriculum in general.

Published
2005

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