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Publication Search Results

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    Extreme environment operation of thick-film SOI SiGe HBTs in both high temperature & radiation-rich environments
    (Georgia Institute of Technology, 2016-04-29) Omprakash, Anup
    The objective of this work is to characterize and investigate the effect of extreme environments, such as high temperature (up to 300$^\circ$C) and radiation, on the response of thick-film SOI SiGe HBTs. Two different SiGe platforms are explored in this work with one aimed at RF applications (180 GHz f\textsubscript{max}) and the other aimed at high performance and high voltage (up to 48V) analog applications (20 GHz f\textsubscript{max}). To the best of the author's knowledge, this is the first look into the 300$^\circ$C operation of thick-film SOI SiGe HBTs and the effect of TID on a high-voltage complementary SiGe platform. Chapter 1 presents a brief overview and summary of the SiGe technology. The effect of incorporating Ge in a Si BJT is emphasized and is quantitatively described. Chapter 2 presents the high temperature (to 300$^\circ$C) DC and AC performance of a $>$ 100 GHz f\textsubscript{T}/f\textsubscript{max} SiGe HBTs on thick-film SOI. Metrics such as current gain ($\beta$\textsubscript{F}), BV\textsubscript{CEO}, M-1, f\textsubscript{T}, f\textsubscript{max} are extracted from 24$^\circ$C to 300$^\circ$C and compared with a bulk SiGe HBT platform. The results demonstrate that while there are degradation to key device metrics at high temperatures, the devices are still usable over a wide temperature range. Additionally, while SOI is known for its high thermal resistance, it is demonstrated that the device is constrained by electrical effects rather than thermal effects at higher temperatures, which should therefore yield acceptable reliability. This work was presented at the IEEE Bipolar/BiCMOS Circuits and Technology Meeting 2015 \cite{omprakash_2015}. Chapter 3 presents the impact of total ionizing dose (TID) on a high-voltage (36V) complementary SiGe on SOI technology, including the effects of irradiation and bias on the device oxides and the implications on forward and inverse-mode device operation. The results indicate a multi-Mrad tolerance to TID similar to other SiGe HBTs, however, they illustrate a slightly anomalous behavior at high injection due to a decrease in collector resistance. A clear difference between forward mode and inverse mode response is also observed with bias. This work was submitted for the IEEE Nuclear and Space Radiation Effects Conference 2016. Chapter 4 provides a summary of the contributions presented in this thesis. Additionally, it outlines the future work to be done based on the current research.
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    Integrated multi-mode oscillators and filters for multi-band radios using liquid crystalline polymer based packaging technoloy
    (Georgia Institute of Technology, 2006-04-06) Bavisi, Amit
    The objective of the proposed research is to develop novel, fully-packaged voltage controlled oscillators (VCOs), concurrent oscillators, and multi-mode filters using Liquid Crystalline Polymer (LCP) dielectric material that are directly applicable to simultaneous multi-band radio communication. Integrated wireless devices of the near-future will serve more diverse range of applications (computing, voice/video/data communication) and hence, will require more functionality. This research is focused on providing cost-effective and area-efficient solutions for multi-band/multi-mode oscillators and filters using system-on-package (SOP) design methodology. Silicon-based integrated circuits (ICs) provide an economical method of miniaturizing modules and hence, are attractive for multi-band applications. However, fully monolithic solutions are limited, by its high substrate losses, and marginal quality factors (Qs) of the passives, to low profile applications. Furthermore, the VCOs made on conventional packaging technologies are not very cost-effective. This thesis is directed towards developing highly optimized VCOs and filters using LCP substrate for use in multi-mode radio systems. The thesis investigates and characterizes lumped passive components on new LCP based technology feasible for VCO and filter design. The dissertation then investigates design techniques for optimizing both power consumption and the phase noise of the VCOs to be employed in commercial wireless systems. This work then investigates the temperature performance of LCP-based VCOs satisfying military standards. Another aspect of the thesis is the development of dual-band (multi-mode) oscillators. The approach is to employ existing multi-band theories to demonstrate one of the first prototypes of the oscillator. Finally, the design of multi-mode, lumped-element type filters was investigated.