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Teleconference systems are widely used in business and education. They are required to enhance only the target speech while suppressing diffuse or interference noise. The minimum variance beamformer is a strong method to enhance the target speech; However, it is less robust at low frequencies. We propose a robust beamformer based on the minimum variance method in the spherical harmonic domain. Less...
In this paper, we consider the design problem of a decentralized variable gain robust controller that provides practical tracking for a class of large-scale interconnected systems with mismatched uncertainties. Furthermore, we show that sufficient conditions for the existence of the proposed decentralized variable gain robust controller are reduced to the feasibility of linear matrix inequalities...
This paper deals with a design problem of variable gain robust model following/tracking control for a class of uncertain linear systems. The new proposed variable gain robust control system is composed of fixed gain controllers and variable ones. In this paper, LMI-based sufficient conditions for the existence of the proposed variable gain robust controller are given. Finally, a simple numerical example...
This paper reports on a frequency agile GaN LNA MMIC that can be reconfigured for both S- and X-band extending operation over multiple octaves of frequency. The LNA is based on a 0.15um GaN HEMT technology and utilizes GaN FET switches to tune the LNA for 3–3.5 GHz Sband and 9–11 GHz X-band operation. Switch tuned for Sband, the amplifier achieves 15 dB of gain, NF ranging from 0.9–1.3 dB, an input...
In scenarios that are ambitious to protect sensitive data in compliance with privacy regulations, conventional score normalization utilizing large proportions of speaker cohort data is not feasible for existing technology, since the entire cohort data would need to be stored on each mobile device. Hence, in this work we motivate score normalization utilizing deep neural networks. Considering unconstrained...
This paper introduces a new class of multiple fractional-order phase lead networks in control system synthesis. Numerators and denominators of analogue realizations of the irrational network units are given in closed forms by an efficient, iterative scheme. These new multiple networks improve the flatness of the phase-frequency plots that is important for a robust design. Moreover, the proposed closed...
Public rescue service system design is determined by deployment of limited number of service centers at positions from a given set of possible locations. The robust service system design is usually performed so that the design complies with specified scenarios by minimizing the maximal value of the objective functions corresponding to the particular scenarios. As the set of detrimental scenarios is...
This paper studies the problem of high-precision positioning of laser beams by using a robust Fractional-Order Proportional-Integral-Derivative (FOPID) controller. The control problem addressed in laser beams aims to maintain the position of the laser beam on a Position Sensing Device (PSD) despite the effects of noise and active disturbances. The FOPID controller is well known for its simplicity...
Even though the design and tuning of proportional-integral-derivative (PID) controllers appears to be conceptually simple it can be difficult in practice, especially when competing control objectives are present. This paper presents a tuning method for PID controllers applied to low stiffness mechatronic systems that allows a direct and intuitive trade-off between the robustness and the performance...
This paper utilizes the quantitative feedback theory (QFT) to design a robust controller for adaptive cutting feedrate control. The proposed algorithm could dynamically change the feedrate according to the spindle current which is highly related to the measured cutting force. The QFT controller could provide the constant cutting force even under different cutting condition. Hence, the machining efficiency...
This paper deals with Fractional Complex Order Controller FCOC tuning. The paper presents new structure of FCOC with the form PIx+iyD, in which x and y are the real and imaginary parts of the integral complex order, respectively. With the controller's five parameters, we can fulfil five design requirements. Design specifications are set to ensure robustness toward gain variations, noise on system...
This paper proposes a force control system using the State Observer Based Disturbance Observer (SO-DOB) and the State Observer Based Reaction Force Observer (SO-RFOB) based on the novel observer gain tuning methodology. The observer gain tuning methodology is based on the stable margin theory. By using the proposed gain tuning methodology, the system stability and the robustness of the SO-DOB and...
The paper deals with the frequency domain design of a robust PID controller for unstable SISO systems. The approach applied is based on performance specification in terms of phase and gain margins; to guarantee the desired performance a modification of the Neimark D-partition is used. In the case study a PID controller has been designed for the laboratory Magnetic Levitation System.
This paper proposes a robust, 3-stage fully-dynamic high-gain residue amplifier for a 12-bit 80MS/s two-stage SAR assisted pipeline ADC. Parametric amplification has been used in the proposed open-loop amplifier to enhance gain. Third stage of the circuit is implemented with dynamic source followers (DSFs), which contributed to gain enhancement and also promised a robust performance against different...
This paper compares multiple loop-shaping combined robust control methodologies including Glover-McFarlane method, H ∞ and H2 in the controller synthesis of track-following application for hard disk drive (HDD). According to the specified loop-shaping goal, the synthesis routines are applied on the Spinstand micro-actuator in order to achieve robust performance in terms of system uncertainties accommodation,...
In this paper, we propose a new variable gain robust controller giving consideration to nominal L2 gain performance for a class of uncertain linear systems. The proposed robust controller consists of a fixed gain designed by considering guaranteed L2 gain performance for the nominal system and an adjustable parameter tuned by updating laws. Furthermore, we show that sufficient conditions for the existence...
Improving interference robustness in ultralow power (ULP) receivers (RXs) is a big challenge due to their low power budget. This paper presents an envelope detector based 915 MHz 10 kb/s ULP RX, which is fabricated in 65 nm CMOS process for wireless sensor networks and Internet of Things. Two power-efficient techniques, transmitted-reference and shifted limiter, are proposed to improve the interference...
In this paper, we introduce an optimal beamformer design that facilitates a compromise between high directivity and low white noise amplification. The proposed beamformer involves a regularization factor, whose optimal value is determined using a simple and efficient one dimensional search algorithm. Simulation results demonstrate controlled tuning of various gain properties of the desired beamformer,...
In this paper a methodology for design automation of bigger analog module is proposed. The proposed methodology uses hierarchical decomposition of the bigger module into its constituents cell level circuits (referred to as leaf cells) and then the cell level circuits are designed using top down constraint driven design approach. This hierarchical decomposition reduces the complexity of the design...
This paper presents a new variable gain robust state observer for a class of uncertain linear systems. The robust state observer proposed in this paper is composed of fixed and variable gain matrices. In this paper, LMI-based sufficient conditions for the existence of the proposed robust state observer are given. Finally, a simple illustrative example is included.
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