A5064244498- Stability and Control of Uncertain Systems
- Advanced Control Systems Optimization
- Radio Frequency Integrated Circuit Design
- Superconducting and THz Device Technology
- Advanced Optimization Algorithms Research
- Matrix Theory and Algorithms
- Microwave Engineering and Waveguides
- Control Systems and Identification
- Adaptive Control of Nonlinear Systems
- Advanced Control Systems Design
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Advanced Optical Network Technologies
- Constructed Wetlands for Wastewater Treatment
- Advanced Battery Technologies Research
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Extraction and Separation Processes
- GaN-based semiconductor devices and materials
- Advancements in PLL and VCO Technologies
- Neural Networks Stability and Synchronization
- Advancements in Semiconductor Devices and Circuit Design
- Analog and Mixed-Signal Circuit Design
- Advancements in Battery Materials
- Municipal Solid Waste Management
University of Akron
2022
Advanced Energy (United States)
2022
Marvell (United States)
2021
University of Zanjan
2021
Cornell University
2017-2019
Tarbiat Modares University
2010-2011
École Polytechnique Fédérale de Lausanne
2007-2010
École Normale Supérieure - PSL
2008-2009
Novosibirsk State Technical University
2009
Convex parameterization of fixed-order robust stabilizing controllers for systems with polytopic uncertainty is represented as a linear matrix inequality (LMI) using the Kalman-Yakubovich-Popov (KYP) lemma. This convex inner approximation whole nonconvex set controllers, and depends on choice central polynomial. It shown that, an appropriate polynomial, all that place closed-loop poles system in disk centered real axis can be outbounded some LMIs. These LMIs used pole placement systems.
A novel theory of stability for two-port networks is developed. Using this theory, a new method designing amplifiers with high-power gain working close to the maximum frequency oscillation (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> ) proposed. Contrary existing amplifier design methodologies, in method, transistor capability power amplification fully utilized. This becomes more important at frequencies f where having...
A novel approach to design efficient high-output power fundamental oscillators beyond f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> /2 of the employed process is presented. The idea shape and maximize unilateral gain (U) network at desired frequency using optimum passive internal external feedback networks. proposed technique significantly improves output dc-to-RF efficiency oscillator. To show feasibility this approach, a 175 GHz...
All H ∞ controllers of a SISO LTI system are parameterized thanks to the relation between Bounded Real Lemma and Positive new concept strict positive realness two transfer functions with same Lyapunov matrix in inequality Kalman-Yakubovic-Popov lemma.This parameterization shares features Youla parameterization, namely on convexity norm constraints for closed-loop functions.However, contrary it can deal any controller order structure such as e.g.PID.The main feature proposed method is that be...
The rapid growth of hyperscale data centers has led to an increased demand for high-speed and low-latency connectivity solution upgrades, which are power-efficient minimal cost. In the last few years, PAM-4 modulation across copper channels was realized by high-performance electrical transceivers in a tight signal integrity environment, employed superior spectral efficiency over NRZ signaling. This shift created relatively smooth path from 28Gb/s 56Gb/s PAM4 per lane keeping same baud rate,...
A novel approach to design efficient high-output-power fundamental oscillators close the f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> of employed process is presented. The idea based on shaping and optimizing maximally power gain (G xmlns:xlink="http://www.w3.org/1999/xlink">ME</sub> ) circuit using a pair internal/external feedback mechanisms. Solving constrained optimization problem, an optimum passive network designed achieve...
This paper presents a new method for harmonic VCO design. A capacitive degeneration is employed to shape the output conductance (Gout) of cross coupled structure increase possible oscillation frequency in addition power. An inductive feedback utilized provide large voltage swing at input transistors boost generation. Finally, passive components collector improves delivery generated current load setting frequency. Using this method, 275 GHz designed and implemented 130 nm SiGe process. The...
The global transition to electric vehicles and renewable energy systems continues gain support from governments investors. As a result, the demand for storage such as lithium-ion batteries (LIBs) has substantially increased. This is significant motivator reassessing end-of-life strategies these batteries. Most importantly, strong focus on transitioning landfilling an efficient recycling system necessary ensure reduction of total emissions, especially those LIBs. Furthermore, LIBs contain...
A novel approach to design a mm-wave high power gain cascode amplifier is proposed. The enhanced by adjusting the size of transistor together with desensitized inductive impedance at its base. this node has critical role in determining both and stability. employed desensitization technique decreases effect process variations modeling errors on which results reliable design. Providing enough degrees freedom, method conjugate matched input output impedances. Therefore, two or more stage can be...
All promising applications of terahertz (THz) and millimeter-wave (mm-wave) systems, from imaging spectroscopy to high data-rate communication, necessitate the design efficiency signal generators. In addition propagation loss signals in these frequency ranges, lack activity current CMOS/SiGe devices (since desired frequencies are close their ƒ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</inf> or beyond it) emphasizes on importance coming...
Convex parameterization of fixed-order robust stabilizing controllers for systems with polytopic uncertainty is represented as an LMI using KYP Lemma. This a convex inner-approximation the whole non-convex set and depends on choice central polynomial. It shown that appropriate polynomial, all place closed-loop poles system in disk centered real axis, can be outbounded LMI. way, regional pole placement achieved by optimization uncertainty.
Robust control synthesis of linear time-invariant SISO polytopic systems is investigated using the polynomial approach. A convex set all stabilizing controllers for a system given over an infinite-dimensional space. finite-dimensional approximation this obtained orthonormal basis functions and represented by LMIs thanks to KYP lemma. Then, LMI based optimization problem robust pole placement with sensitivity function shaping in two- infinity-norm proposed. The simulation results show...
In this paper, the problem of robust stability analysis and synthesis time-delay systems is investigated. Delay assumed to be time varying system supposed linear with polytopic uncertainties. A new type Lyapunov-Krasovskii functional proposed. The resulting delay-dependent conditions in from LMIs turn less conservative than existing conditions. proposed criteria then employed design a state-feedback controller for delayed such that closed-loop maximum amount delay guaranteed. LMI are...
This paper deals with overshoot reduction in fixed order controller design for linear systems subject to polytopic uncertainty. The basis of the developed synthesis method is a recent convex parameterization fixed-order stabilizing controllers based on polynomial approach. Two constraints are decrease closed-loop step response. First, existing and peak-to-peak gain performance criterion minimize peak value In second method, Markov parameters system used achieve response less overshoot....
All ℋ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∞</sub> controllers of a SISO LTI system are parameterized thanks to the relation between Bounded Real Lemma and Positive Lemma. This new parameterization shares features Youla parameterization, namely convexity norm constraints for closed-loop transfer functions. However, by contrast it can deal with any controller order structure, e.g. PID controllers. Moreover, be easily used systems...