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Integrated digital circuits are frequency capped by its heavily constrained paths between flip-flop stages. These so-called critical paths are highly susceptible to delay fluctuations leading designers to use guard-banding in order to avoid timing violations. Several effects can cause these variations, whereas aging is of rising importance. Many works have addressed this issue through monitoring of...
The challenges of the Internet of Things (IoT) in an urban environment are driven by smart vehicles which need to be able to efficiently sense and communicate with other nearby vehicles. System-on-chip (SoC) applications in the automotive market have strict circuit performances and reliability requirements for a temperature range of up to 175 0C. This work proposes an analysis of latched-comparators...
This paper addresses the issue of lag consensus of the leader-following multiagent systems with communication delays and switching topologies. Lag consensus means that the states of the followers lag that of the leader. Based on the graph theory and the common Lyapunov-Krasovskii functional method, we design a protocol ensuring the lag consensus of multiagent systems with communication delays under...
This paper is concerned with the consensus problem for general first-order multi-agent systems over undirected topology. Under the assumption that the topology is connected and every agent receives neighbors information with time-varying communication delay, allowable delay bound depending on the agent dynamics, topology structure and the control gain is obtained. In particular, in case of first-order...
The average consensus problem of multi-agent systems (MASs) with switching directed network and time-varying delays is discussed in this paper, where the switching topologies are kept weakly connected and balanced. Firstly, the n-dimensional MASs model is reduced to (n-l)-dimensional subspace. Then, some sufficient conditions for average consensus are achieved based on reciprocally convex approach...
The multi-tracking problem of second-order multi-agent system with communication delay is investigated in this paper. An intermittent control protocol is proposed on the basis of only relative position measurement, where the information of agent is quantized before transmission using stochastic quantization scheme. On the basis of algebraic graph theory, stochastic quantization and stability theory,...
The present work proposes a self-bias compensation technique for the frequency supply voltage dependence in low cost charge/discharge oscillator topologies. The main bias current of the oscillator will include a supply voltage dependent current. The main goal is to reduce the supply voltage dependence for a range between 1.6 and 2V, for a current starved ring oscillator and a new charge/discharge...
Due to its modularity and scalability, modular multilevel converter is a promising topology for medium voltage applications, such as energy storage or motor drives. Because of the large number of modules, the wiring can become complex if the conventional star topology communication network is used. To solve this issue, a communication link that uses a ring topology to connect the central controller...
Frequency-domain criterion on containment control for general linear multi-agent systems with time delay is studied under the directed network topology. A distributed protocol with time-invariant delay is proposed. When time-delay is an unknown constant, frequency-domain criterion on containment control of general linear multi-agent systems with delay is obtained, and an upper bound of delay is given...
Time-Sensitive Networking (TSN) is becoming more important in automotive and industrial sectors. There is no clear strategy how to use TSN to improve and migrate the established real-time protocols without excluding legacy devices. This paper presents a realistic concept to integrate TSN into automation networks. We choose Sercos as a deterministic Industrial-Ethernet protocol to be extended with...
This paper analyzes the transmission efficiency of two kinds of communication technologies: summation frame and individual frame. The abstract models for these two communication technologies using linear topology, which is the most popular topology in industrial control field, are proposed in this paper. The simulation results based on the models show that summation frame has a significant performance...
Among the schemes proposed for failure recovery in software-defined networks, installing backup paths in advance is considered to be an effective approach to reduce the recovery latency. However, the pre-installation poses undue storage overheads on flow tables. In this paper, we propose a customized and cost-efficient backup scheme, which achieves fast recovery from any single-link failure. We introduce...
Continuous-review inventory control problem in goods distribution networks is addressed from a control-theoretic perspective. In contrast to the earlier works concentrating on the fundamental serial and parallel-path configurations, a multi-echelon mesh topology network of suppliers, distribution centers, and retailers is considered. The external, uncertain demand may be imposed on any node in the...
Periodic speed errors can occur in permanent magnet linear synchronous machines for two reasons: 1) a periodic reference signal; 2) cogging force and friction. For reducing such periodic errors, iterative learning control or repetitive control approaches, used in conjunction with more common control actions, can be strongly effective. However, the design of the stability filter, robustness filter...
This paper addresses the containment control problem for discrete-time high-order multi-agent systems with time-varying delays. Based on the distributed containment control protocol only depends on the agent's own information and its neighbors' partial information, the properties of the product of infinite nonnegative matrices and the composite of binary relation are utilized to derive a necessary...
It is well-known that the communication among agents plays an important role in leader-following consensus. When the communication fails, it will greatly degrade the performance of the leader-following consensus. As technology develops, memory components are quite cheap. Thus it is very natural to use the information before the communication failure to enhance the robustness of leader-following consensus...
This paper proposes a newly distributed reduced order agreement protocols based on the observer to investigate the consensus problem of high-order multi-agent systems with various agents and non-uniform delay of various time and directed communication topology. First, on the basis of Riccati equation, Lyapunov method, as well as Algebraic-Graph theory, a novel algorithm with multistep, is provided...
Average-consensus filter problem is investigated for a mixed-order multi-agent system, which consists of first-order and second-order agents, and the proportional-integral consensus filter algorithms are proposed for the agents with different constant inputs. Based on generalized Nyquist stability criterion, sufficient convergence conditions are obtained for the multiagent system under a fixed, symmetric...
In this work, an improved topology of a relaxation oscillator is proposed, dealing with the non-idealities of the comparator stage. The oscillator test chips, manufactured in 0.35-μm CMOS process, have the nominal frequency of 1 MHz and typical power consumption of 210 μW. The area of the oscillator core is 0.04 mm2. The measured temperature variation of the output frequency is ±0.4% in the temperature...
The paper proposes a method to synthesize a digital controller for multiphase switched capacitor converters (SCCs). A specific requirement to the controller is that, regardless of external conditions, it should provide pulses of fixed frequency and width. Asynchronous (self-timed) digital circuits fulfil this requirement by definition. However, their design can be quite complex, especially if an SCC...
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