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A novel slow wave structure (SWS) called sine ridge waveguide (SRWG) has been proposed for a wideband high-power terahertz radiation source. The cold bandwidth of the SRWG is similar to the sine waveguide structure. Meanwhile, the interaction impedance of the SRWG is about 70% higher than sine waveguide at 0.65THz with the same dimensional parameters. Furthermore, it possesses low ohmic losses and...
Injection-locked oscillators (ILO) have widespread use in wireline and wireless systems as fast-locking clock generators, phase noise filters, and frequency multipliers/ dividers, but their modeling and simulation typically resort to SPICE due to their nonlinear, time-varying characteristics. This paper presents a way to simulate ILOs in an event-driven logic simulator such as SystemVerilog, based...
It is discussed that the changing of parameters in the battery pack model affects the control accuracy and dynamic response of the charging system, through establishing the peak current small signal model of the full-bridge converter and load battery packs' model of the charging system. Moreover, the disadvantages of fixed parameters PID control are put forward. An online identification method is...
Quadrature oscillator based on the operational transresistance amplifier (OTRA) is presented in this paper. The proposed quadrature oscillator circuit uses two OTRAs as main active building blocks and a few external passive components to generate the oscillations. The circuit provides independent control over the condition of oscillation and frequency of oscillation. A prototype circuit is implemented...
This paper generalizes the concept of the oscillators based on the operational transresistance amplifier (OTRA) into the fractional order domain. The added parameter in the fractional-order design is an important in practical and can model the non-ideality of the conventional capacitors. The general condition and frequency of oscillation have been derived analytically in terms of the circuit components...
This paper presents a kind of biomimetic neural circuit for simulating and implementing sidewinding of a snakelike robot. Biologically inspired by the neural circuit diagram in the spinal cord of lampreys, we propose a neural oscillator model and a chained inhibitory neural circuit. A set of leaky integrator type and sigmoid type interneurons is incorporated into the design of the neural diagram for...
It has been shown that the complicated nonlinear vibration phenomena in mechanical workpieces under excitations of intense ultrasonic pulses increase greatly the detectability of defects (cracks). To study the nonlinear vibration phenomena of plates induced by the ultrasonic pulses, an electrical circuit model is proposed to simulate the mechanical vibro-impact motions between the transducer horn...
The potential of the genetic clock is in its role to trigger consecutive logic reactions in sequential biological circuits. However, it is hard to directly create a square wave generator in the gene regulatory systems for use as a genetic clock. This research studies the design of a genetic clock generator based on combination of a genetic oscillator with a toggle switch via a dual repressor. This...
Synchronization of coupled oscillators is a pervasive theme of multi-disciplinary research. Focused on circuit-theoretic applications, in this paper, we derive sufficient conditions for global asymptotic synchronization in a system of identical nonlinear circuits coupled through linear time-invariant (LTI) electrical networks. The nonlinear circuits are composed of a parallel combination of passive...
In this work we present a theoretical study based on time-domain Monte Carlo (MC) simulations of GaN-based Self-Switching Diodes (SSDs) oriented to the experimental achievement and control of the sub-THz Gunn-oscillations potentially provided by these devices. With this aim, an analysis of the frequency performance of SSDs connected to a resonant RLC parallel circuit, is reported here. V-shaped SSDs...
Measuring graphene RF devices performances relies heavily on the precision of the de-embedding techniques adopted. Small line sizes increase variability issues in the RF standards and test devices, and require line width transitions. In this work, a robust and high precision de-embedding technique is adopted to the particular needs of microwave graphene devices. Two standards and only one step after...
Vibration energy harvesting is a technique for the generation of electricity from ambient vibrations. Electrostatic vibration energy harvesters (e-VEHs) are particularly compatible with microtechnology and can serve as a source of energy for autonomous microsystems. E-VEHs require conditioning electronics to effectively sequence different phases of energy conversion. One of the most promising circuits...
In this review paper, we define and discuss the concept of complexity for heterogeneous systems. Due to the current progress in fabrication technology, modern micro-scale integrated systems may have a large number of interacting elements. Each of those elements not only displays its own dynamical properties, but also, in the most general case, can be nonlinear or can belong to different physical domains...
This paper shows a system to measure the Equivalent Series Resistance (ESR) and Capacitance (C) of capacitors. This system provides a cost effective solution for Prognostic Health Monitoring (PHM) of capacitors used in fully electric vehicles (FEV) and medium-power switching supplies. The system is based on a Hartley resonant topology formed by two inductors and a variable capacitor. This circuit...
A new fundamental theory of ‘coupled processes’ is here applied to be able to explain and to some extent predict the observed instability and spectrum fluctuations of LC and crystal oscillators. The outcome is a ‘spectrum coupling’ theory which is based on the concept of coupled energy exchange between spectrum components. The origin of the coupling can be said to be ‘energy conservation’ as in the...
A dedicated hardware simulation tool is used to solve specific mathematical as well as electronic problem: finding global minimum and maximum function values (coordinates in Cartesian coordinate system). A new class of peak detectors based on fuzzy min and max gates has been proposed. Hardware methods, having pure mathematical background, in detecting x-coordinates of function extremes are explained,...
A two-level simulation methodology for coupled-oscillator systems is presented. The inner level corresponds to the harmonic-balance analysis of the elementary oscillator in free-running regime, so as to obtain a one-port reduced-order model. The outer level corresponds to the analysis of the coupled system, deriving a formulation that explicitly relates the oscillation-frequency deviation and the...
Due to the measurement techniques developed, it is now possible to observe signals at different levels in neural structures. These observations give rise to increasing works dealing with setting up the relation between such signals and cognitive processes, neurodegenerative diseases and neurobehavioral disorders. Computational neuroscience is becoming more influential in investigating the mechanisms...
This paper introduces a memristor based redundant binary adder for canonic signed digit code, that coding eliminates the carry and provides a carry-free addition. The proposed binary adder circuit tries to achieve high addition speed that is independent on the length of the data using the accumulation property of a Nano-element called a memristor. The general block diagram of the proposed circuit...
This paper presented of third-order sinusoidal oscillator using VDTAs and grounded capacitors. The proposed circuit consists of two VDTAs and three grounded capacitors. The grounded capacitors are suitable for IC implementation. The oscillation frequency and oscillation condition can be electronically adjusted via DC bias currents of VDTAs. The sinusoidal output signals are comprised the voltage and...
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