Browsing by Author "Michael Steer, Committee Chair"
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- Behavioral Modeling and Characterization of Nonlinear Operation in RF and Microwave Systems(2006-06-13) Walker, Aaron; Rhett Davis, Committee Member; Gianluca Lazzi, Committee Member; Michael Steer, Committee Chair; Kevin Gard, Committee MemberModeling and characterization strategies were developed to capture the complex nonlinear behavior of both the components within an RF circuit and within an assembled system. Metrology techniques using common laboratory instrumentation were developed for the remote characterization of assembled RF devices and the result of this characterization is presented here for the first time. In addition, two novel intermodulation relative phase measurement systems were developed that have 90 dB of dynamic range which is a considerable improvement over existing systems. This enables the measurement of weaker nonlinearities and increases the accuracy of these measurements. A behavioral modeling architecture and extraction procedure were developed to take advantage of the metrology techniques to allow the separation of odd-ordered nonlinear effects and baseband upconversion effects in several amplifiers. The results of applying this modeling strategy has produced a general model capable of predicting both magnitude and phase asymmetries in nonlinear components for the first time. Concepts from the remote characterization, intermodulation phase measurement systems, and the modeling efforts were combined to demonstrate the extraction of two-port transmission parameters from one-port measurements in a archetypal circuit of an integrated bandpass filter in an RF front-end. It is shown how this information can be used to tune a filter.
- Characterization of Various Antenna Structures Used For Device Illumination(2004-06-02) Buff, Peter Marcus; Hamid Krim, Committee Member; Michael Steer, Committee Chair; Doug Barlage, Committee MemberA non-intrusive approach for personal surveillance is explored. A potential strategy for identification of electronic devices using electromagnetic illumination with the aim of identifying unique resonances and signatures is presented. The concept is that signatures can be compared to a known signature for a particular device. If discrepancies are detected, then the device may be flagged as a suspect item. Various antenna structures are analyzed to determine the ideal antenna characteristics needed for electromagnetic illumination. A double ridged horn antenna is designed, characterized and compared to a conical spiral right hand circular polarized antenna and a standard gain antenna. Various passive structures and electronic devices are illuminated with electromagnetic energy and responses analyzed.
- Dynamic Electrothermal Simulation using Compact Macromodel of Standard Cells.(2010-10-11) Priyadarshi, Shivam; Michael Steer, Committee Chair; David Schurig, Committee Member; Paul Franzon, Committee Member
- Electrothermal Analysis of Three-Dimensional Integrated Circuits.(2011-02-24) Harris, Theodore; Michael Steer, Committee Chair; Henry Schaffer, Committee Member; William Davis, Committee Member; David Schurig, Committee Member
- Layout Oriented Design Practice for Capturing Distributed Effects in High-Speed Circuits.(2002-10-20) Uppathil, Satish Vijayan; Michael Steer, Committee Chair; Gianluca Lazzi, Committee Member; Griff Bilbro, Committee MemberAn integrated environment for layout-oriented design of circuits for spatial power combining system is aimed in this study. The simulation environment would include a full-wave electromagnetic simulator and a circuit simulator, TRANSIM, with a front engine, which is the major emphasis in this document. Also, the controlled and independent sources based on the Hspice models are implemented in the state-variable based object-oriented circuit simulator, TRANSIM. Transim implements local reference node instead of a global ground and this is crucial for distributed circuits. The models are implemented in object-oriented fashion and uses automatic differentiation. The same model can be used for DC, transient and harmonic balance analysis.
- Transistor Modeling using Advanced Circuit Simulator Technology(2002-04-30) Kriplani, Nikhil M; Michael Steer, Committee Chair; Paul Franzon, Committee Member; Griff Bilbro, Committee MemberThe advanced MOSFET model based on the Berkeley Short Channel IGFET Model (BSIM) version 4 is implemented in the circuit simulator Transim. The model is implemented as a charge controlled model using object-oriented programming and automatic differentiation. The result is a dramatically simplified approach to implementing the BSIM4 model in a simulator. The modeling technique does not use the associated discrete modeling approach commonly used in circuit simulators with the result that off-the-shelf numerical solvers can be used. The model is a simulator independent model and the same model code can be used for DC, transient and harmonic balance analysis. Implementation of the model was completed in 7 months with 17 pages of C++ code compared to the original code for the model implemented in SPICE that was 200 pages long. Results for an NMOS circuit are presented for DC and transient analysis.
