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In this work a model of the oscillator with inductive coupling of the gates operating at ultralow voltage is presented and experimentally verified. The topology needs a bias voltage at the gates, and we propose a circuit called starting block to generate this voltage from the supply. Theoretical behavior is compared with experimental results, showing good agreement. The circuit, which behaves as astable...
For the excellent electrical performance, Gallium Nitride (GaN) new-type semiconductor devices are preferred in high voltage, high frequency and high power applications. However, GaN devices have low on-resistance and the loop layout requires low damping in high frequency loop. These both can lead to voltage and current oscillations under high frequency and even cause uncontrollable oscillations,...
This paper is on the study of double coupled oscillators, where two cross-coupled differential oscillators share the same bias current. Without external coupling, competition for bias current happens, and the one with a higher Q can grab most of the current, and the other one is starved to death. With external coupling, a beat pattern is generated and the beat frequency is strongly related to the...
To extend the concept of the memristive systems to capacitive systems, memcapacitive systems have been described in 2009. Memcapacitors which are a subset of memcapacitive systems are flux-dependent nonlinear circuit elements with memory. Materials with memcapacitive properties has already been reported in literature. The elusive memcapacitor show promise for new type of applications because of their...
In this study, we investigate synchronization in complex network with two hubs by using parametrically excited van der Pol oscillators with parameter mismatch. By means of computer simulation, we confirm various change of synchronization probability in complex network, and observe effects on synchronization probability by changing structural metrics (degree and path length) in subset of the nodes...
To date, a family of series-connected boost converter (SCBC) with enhanced efficiency has been presented as the front-end dc/dc stage of distributed photovoltaic (PV) inverter, which suffers the severe PV voltage/power oscillation when operated under unbalanced grid voltage condition. This paper proposes an operational scheme to enhance the performance of one type SCBC, namely the dual-input central...
This study presents a parasitic-aware RF circuit synthesis tool, in which layout-induced parasitics of passive devices are captured by using sophisticated equivalent models for them. Recently, analog circuit design has been fully automated, where a circuit sizing is followed by a layout generator. However, there is often a discrepancy between synthesis and post-layout results, especially for RF applications,...
In this paper, it found that the low frequency oscillation phenomenon causing large inductor current and output voltage variations exists in the constant-on-time (COT) controlled boost converter, while the time constant of the output capacitor is below a critical value. The critical value is deduced, which is related to the main circuit parameters such as input voltage, inductance and load current...
In this study, we investigate synchronization of parametrically excited van der Pol oscillators with small mismatch. In the case of two subcircuits, we confirm that the two subcircuits are synchronized at in-phase state when the adding mismatch is small. By increasing the small mismatch, we observe unsynchronous phenomena. Furthermore, we apply this circuit model to ten coupled oscillators as random...
The application of time-varying root-locus (TVRL) algorithm for transient analysis of electronic circuits with potentially unstable operating points is presented. The TVRL algorithm calculates the dynamic movement of evolving characteristic equation roots by computing them at a sequence of time instants during the circuit transient. This TVRL indicates the existence of potentially unstable operating...
The pseudo transient-analysis method is regarded as one of the most effective method to find DC operating points for nonlinear circuits. In this paper, we combine the ramping method and the damped pseudo-transient analysis algorithm together in order to improve the simulation efficiency. By combing the two algorithms together, the oscillation problem and time-consuming problems can be greatly eliminated...
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...
Numerous circuit topologies have been proposed for divide-by-m injection-locked frequency dividers (ILFDs), most of which have been optimized for division by even numbers, especially divide-by-2. It has been more difficult to realize division by odd numbers, such as divide-by-3. This paper describes a CMOS injection locked frequency divider (ILFD) that can operate equally well in both divide-by-two...
We design and simulate an improved wideband chaotic Colpitts oscillator based on micro-strip technology. The numerical and circuit simulation results are presented in order to verify the performance of the developed oscillator. In addition, we propose the synchronization model between two identical improved chaotic Colpitts oscillators coupled by a resistor. The chaotic synchronization, one of the...
A fully-integrated DC/DC converter for energy harvesting applications is presented. The startup-voltage of the converter is about 140mV, the output voltage exceeds 1.5V, with a power efficiency at least 20%. The architecture for boosting such extremely low voltages is based on an ultra-low-voltage oscillator cross connected to two phase charge pump. The overall circuit does not require any external...
A well performing thin film can be obtained by adding pulse bias on the magnetron sputtering substrate. However, serious load voltage oscillation, caused by the capacitive component in the plasma load, affects thin film deposition. The paper analyzes the cause of producing oscillation theoretically based on the magnetron sputtering plasma load equivalent circuit loop model. Although the voltage oscillation...
A linear modeling method is presented to inhibit nonlinear characteristics of Colpitts circuit. It is by means of Taylor expansion of the normalized state equation that linear model is achieved. Additionally other circuit parameters are derived by selection of less than traditional parameters, which being apt to modeling prescribed frequency nonlinear Colpitts circuit.
Coupled oscillatory systems are suitable to express synchronization phenomena, and it is important to unveil nonlinear phenomena. In this study, we investigate the synchronization phenomena observed in four coupled van der Pol oscillators as a regular tetrahedron form. We observe the rotation of the phase difference between anti-phase state and asynchonization state. Furthermore, the sojourn time...
Using a differential voltage current conveyor transconductance amplifier (DVCCTA) device with a single RC-section some new synthetic grounded lossless inductor circuits are proposed. The inductance (L) is practically active-insensitive to the device port mismatch errors (ε) and there is no component matching constraint. With a nonideal device, the presence of small parasitic shunt capacitances at...
The paper proposes a novel implementation of a LC oscillator using an active inductor. The advantages of the method are discussed. The simulations prove the performance of the oscillator with an active inductor. The two phase oscillator based on two simulated CMOS inductors structure consists of a balanced differential CMOS circuit with negative intrinsic resistance and was simulated in a 0.18 μm...
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