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Microwave acoustic filters operated at high power levels generate nonlinear mixing products necessitating improved nonlinear modeling. The latest communications protocols place strict limits on such mixing products including the generation of intermodulation distortion products, which desensitize a receiver, as well as second harmonic emissions. We extend the conventional nonlinear acoustic theory...
The paper derives mathematical conditions for the occurrence of touching points on the hysteresis loop of an ideal voltage-controlled memristor driven by the sinusoidal voltage.
A novel method of doing co-ordinate transformation for LC/van der pol(vdp) oscillator is proposed. It allows vdp to be solved as a conservative system by applying Hamiltonian formulation using calculus of variation. The procedure is developed to calculate the constant of integration, a generalized concept of energy. Such constant of integration, which is different from energy, has implication on the...
This paper introduces a new extended averaging method for switching power converters. By extending the conventional averaging techniques, this method is capable of modeling power converters with multiple switching frequencies. Using this method, a model for a cascaded dc-dc converter is derived. Comparison between the model and the non-averaged system is performed. Experimental verifications are provided...
This paper is aiming at making behavioral model of RF device by using Volterra series theory. When we consider the periodic input signal, the Volterra series will presents a discrete form. In this paper, a five-order nonlinear system is applied to derive the Volterra series expansions which can express DC term and harmonic components in frequency domain. The simulation shows that the performance of...
In this paper, the TWT nonlinear equations are newly derived by considering the higher harmonics. The nonlinear process is also simulated by the Russian simulation code TWTSNU. Compared with the simulations, the derivations of this paper have the discrepancy of about 2%, while the old equations of about 10%. Also, it can be clearly seen from this paper that the output power of fundamental harmonic...
In this paper a new modulation technique that can be adopted to obtain various possible output voltages depending on the switching topology and the voltage inputs available is presented. Then this technique is used to obtain a symmetric two-phase sinusoidal voltage with π/2 phase difference from an asymmetric two-phase sinusoidal input. A symmetric two-phase voltage source can be useful in many cases...
The simulation of Radio Frequency circuits can be very CPU expensive due to the large number of equations present as well as the density of the Jacobian matrix. This problem becomes even more pronounced when simulating a system containing multiple circuits. In this paper a model order reduction method is proposed for obtaining a reduced order nonlinear macromodel for an RF circuit block. This macromodel...
In this paper, three calculation methods of torque for Surface-Mounted Permanent Magnet Synchronous Machines (SPMSMs) are performed, and the results including the average torque and the torque ripple from each method are compared. This is in order to enable one to choose an effective torque estimation technique for further torque ripple minimization in these machines. Accordingly, a vector controlled...
Interior Permanent Magnet Synchronous Motor(IPMSM) is used for wide applications because of its large torque density and high efficiency. However, IPMSM has large space harmonics and strong magnetic nonlinearity. The establishment of the dynamic characteristic analysis technique is required to examine control techniques to high performance and high efficient drive of IPMSM. In the paper, a new matrix...
Arbitrary-load-dependent X-parameters, automatically measured with a load-tuner working with an NVNA, are used to characterize and model a packaged 10W GaN transistor. A full nonlinear two-port functional block model for PA and other circuit design is immediately available for nonlinear simulation. It is demonstrated that the model predicts well the independent effects of harmonic load tuning without...
The widely used Mason equivalent circuit is an exact 1-dimensional linear acousto-electric solution for a piezoelectric plate of finite thickness. When the nonlinear property of the piezoelectric medium cannot be ignored, an appropriate modification has to be made to the piezoelectric constitutive equations. An exact solution, within the desired numerical accuracy, to the nonlinear acousto-electric...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
This paper presents asymmetric circuit models and inductance parameter measurement method for Permanent Magnet Linear Synchronous Motor (PMLSM). Asymmetric circuit models considering the saliency and inductance harmonic effects are discussed for PMLSM. All fundamental and harmonic inductance parameters are easily determined by a standstill test using a single-phase commercial source. Experimental...
This paper proposes a approach to filter the harmful harmonics using a five-level diode-clamped converter based shunt active power filter. A multi-level converter provides superior filtering performance however, it suffers from a voltage imbalancement in its DC-link. Therefore, a novel control method for an auxiliary balancing circuit and a pulse-width modulator are also proposed. The mathematical...
Volterra analysis of the ultra high-speed CMOS switched source follower (SSF) track and hold amplifier (THA) is presented based on a simplified RF model. Approximate expressions for the transfer function, the harmonic equations and third-order intermodulation distortion equation are derived respectively. Simulations based on a commercial available 65 nm CMOS process technology are performed with the...
An AC arc furnace is an unbalanced, nonlinear and time varying load, which can cause many problems to power system quality. Different studies on arc furnaces harmonics analysis can be found in the bibliography on the topic; however, it is very difficult obtain an exact model that takes into account all the parameters that have influence on the process, therefore it is necessary to take measurements...
The control-to-output (CTO) frequency response of switched DC-DC converter describes how the small-signal harmonic perturbation of the converter switching duty ratio influences the converter output. In the paper, the CTO frequency response obtained by the method of harmonic balance is compared with the CTO response, obtained by applying the well-known State-Space-Averaging (SSA) technique to switched...
An envelope method of RFIC simulation is mainly discussed in the paper. In the method, the slowly varying envelope components are for transient analysis of SPICE. On each time point of the transient analysis, fast pulse response is calculated by the harmonic balance method, and relatively insensitive to the rate of the high frequency carrier. The method could be used to efficiently simulate the transient...
This paper presents a new circuit model of SSSC based on state equations in three-wired systems. SSSC is a series compensator of FACTS family. It injects an almost sinusoidal voltage with variable amplitude and is equivalent to an inductive or a capacitive reactance in series with the transmission line. The analysis of a power electronics system is complex, owing to its switching behavior. Since such...
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