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Ultra-low voltage design makes signal level conversion a critical component in modern low power designs. This paper proposes a static level converter operating in the subthreshold regime, called SLC (Split-control Level Converter). Using a novel circuit structure, SLC effectively eliminates the high leakage and short circuit currents in previous approaches. Designed for 300mV to 2.5V conversion and...
This paper addresses the robust stability analysis problem of T-S fuzzy systems with interval time-varying delays. In the derivation, this paper provides a useful relaxation technique to obtain a less conservative stability criterion from an appropriate Lyapunov-Krasovskii functional dependent on fuzzy weighting functions.
In this paper, some delay-dependent LMI stabilization criteria are proposed to design H∞ switching control and switching signal for discrete switched system with interval time-varying delay. Some nonnegative inequalities are used to improve the conservativeness of the proposed results. Finally, a numerical example is illustrated to show the main proposed result.
This paper demonstrates the effectiveness and robustness of amplifier finite gain bandwidth compensation within a wideband third order continuous time delta sigma modulator and the effects of process, mismatch and temperature on modulator stability. In many state of the art designs, GBW is kept safely above the sampling frequency of the modulator, which suffers a power penalty especially for high-speed...
There have recently been serious social issues involved in multimedia signal processing such as malicious attacks and tampering with digital audio/speech signals. Fragile speech watermarking is a technique that enables the detection of tampering with the original signals. We previously proposed an inaudible digital-audio watermarking approach based on cochlear delay. We investigated how the proposed...
To securely exchange data over public networks, such as the Internet, organizations often utilize Virtual Private Networks (VPNs). However, relying on these potentially large overlay networks makes them vital targets for Denial-of-Service(DoS) attacks. Thus, recent approaches for VPN auto-configuration address DoS resistance by employing distributed management algorithms. Nevertheless, there is no...
We analyze the spectral zero-crossing rate (SZCR) properties of transient signals and show that SZCR contains accurate localization information about the transient. For a train of pulses containing transient events, the SZCR computed on a sliding window basis is useful in locating the impulse locations accurately. We present the properties of SZCR on standard stylized signal models and then show how...
The main challenge for provisioning of Mobile TV services is to overcome long burst errors as are often found in mobile reception conditions. Long time interleaving can be implemented by means of Application Layer FEC (AL-FEC) to increase the time diversity of the signal and thereby its robustness against burst errors. The main obstacle of long time interleaving for streaming services is the increase...
This paper is concerned with robust H∞ control of uncertain networked control systems with interval time-varying delay and packet dropout. For less conservative transformation, we propose a new integral inequality by dividing time interval into two subintervals and defining an appropriate scalar instead of introducing free weighting matrix. Based on this integral inequality, a new delay-dependent...
This paper is concerned with the stabilization problem of discrete-time systems with stochastic sampling. It is assumed that there are a single-rate sampling in the plant input and two stochastic sampling rates in the controller input whose occurrence probabilities are given constants and satisfy a Bernoulli distribution. By Lyapunov function approach, a new sufficient condition is presented for the...
In this paper, robust H∞ control for a class of linear systems with time-varying delay is studied. The time delay is a continuous function belonging to a given interval, which means that the lower and upper bounds for the time-varying delay are available, but the delay function is not necessarily differentiable. Based on Lyapunov-Krasovskii theory combined with Leibniz-Newton's formula, new delay-dependent...
The problem of global robust periodicity is studied for a class of neural networks with norm-bounded parameter uncertainties and multiple time-varying delays. Some linear matrix inequality (LMI) representations of delay-dependent periodicity criteria are presented to guarantee the existence, uniqueness and global asymptotic stability of periodic solution for all admissible parametric uncertainties...
This paper discusses the robustness of nonlinear model predictive control (NMPC) based on sub-optimal solution obtained under reduced precision solution (RPS) criteria. NMPC needs to solve the optimal control problem (OCP) quickly and the input is injected to the controlled plant in time. Traditional convergence criteria in optimization algorithms usually cost excessive long computation time with...
This paper mainly studies the problem of designing a non-fragile robust controller for a class of singular discrete non-linear systems with delayed state and uncertainties. Based on Lyapunov stability theory and linear matrix inequality (LMI), LMI-based sufficient condition for the singular discrete nonlinear systems to have robust performance is derived. The condition enables us to determine robust...
This paper investigates the robust stability for time-delay Hamiltonian systems with polytypic uncertainties. Both delay-independent and delay-dependent criteria are established based on the dissipative structural properties of the Hamiltonian systems and the Lyapunov-Krasovskii (L-K) functional approach. All the proposed stability conditions are expressed in terms of Linear Matrix Inequality (LMI)...
This paper presents a soft error hardened latch suitable for reliable operation. The proposed circuit is aimed to tackle the particle hit effect on the internal nodes, external logic, as well as the pulse generator circuit. The hardening method is based on redundancy to protect internal nodes and filter out transients resulted from combinational logic. It also uses redundant clocking technique which...
This paper addresses the design of switching rule for robust stability of a class of uncertain switched system with delay. The system to be considered is autonomous and the state delay is time-varying. Using Lyapunov functional approach, restriction on the derivative of time-delay function is not required to design switching rule for the robust stability of switched systems with time-varying delays...
The implementation of Model Predictive Control (MPC) requires to solve an optimization problem online. The computation time, often not negligible especially for Nonlinear MPC (NMPC), introduces a delay in the feedback loop. Moreover, it impedes fast sampling rate setting for the controller to react to uncertainties quickly. In this paper, a dual time scale control scheme is proposed for linear/nonlinear...
In order to maintain a small, stable backlog at the router buffer, active queue management (AQM) algorithms drop packets probabilistically at the onset of congestion, leading to backoffs by Transmission Control Protocol (TCP) flows. However, wireless losses may be misinterpreted as congestive losses and induce spurious backoffs. In this paper, we raise the basic question: Can AQM maintain a stable,...
Data centers are nowadays ubiquitous, in a worldwide scale, and often geographically dispersed. In such environments, data reliability and availability are enhanced via data redundancy throughout the distributed storage. Because user performance is important in data centers, data updates in such distributed environments are done such that eventual consistency is achieved. In this paper we utilize...
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