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This brief presents a new structure of active inductors. These synthetic inductors are designed using current controlled voltage sources. The signal flow graph method is used for this purpose. For the practical realization, operational transresistance amplifiers (OTRAs) are replicated using current conveyors. The proposed inductors have very interesting properties because the value of its inductance...
The use of performance trade-off fronts, also known as Pareto fronts, in emerging design methodologies for analog integrated circuits is a keystone to overcome the limitations of the traditional top-down methodologies. However, most techniques reported so far to generate the fronts neglect the effect of the surrounding circuitry (such as the output load impedance) on the Pareto-front, thereby making...
Particle swarm optimization (PSO) has shown to be an efficient, robust and simple optimization algorithm. Recently, the mono-objective version of the PSO algorithm was adapted and used to optimize only one performance of RF circuits, mainly the voltage gain of low noise amplifiers. In this work, we propose to optimize more than one performance function of LNAs while satisfying imposed and inherent...
Mathematical equations are possible to simulate with various electronic circuits. Inductors and capacitors intrinsically are capable of integrating and differentiating, and active components alone can realize such algebraic operations as addition and multiplication. In this work, linear differential equations are shown to be implemented with three active components, namely operational amplifiers(Opamp),...
Inductors play an essential role in the design of RF circuits. The parasitic effects plaguing integrated planar inductors require an accurate modeling and the careful exploration of their performance trade-offs. In this paper, a multi-objective performance modeling technique of planar inductors is presented, that supports both top-down and bottom-up design of RF circuits.
According to chaotic characteristics, a method for studying on chaos by using Poincare sections is proposed. The method can study on sensitivity to parameters and initial conditions for chaotic system. A lot of experiments based on Chua's chaotic circuit have been done. The simulation results demonstrate the effectiveness of this method.
In this work, the authors discuss the design of two low noise amplifiers (LNA) based on 1 μm gate-length pHEMT InP transistors and using two different topologies. Designed for radio astronomy applications, the first is a cascode circuit with a maximum gain of 15 dB and noise figure of 0.6 dB, while the second is a 2-stage cascaded amplifier with 27 dB of gain and 0.63 dB of noise figure. The two amplifiers...
When simulating mixed-signal systems, designers are often dissatisfied either with performance or accuracy. A state-space based precomputation method for analog circuits at electrical level allows for a considerably faster simulation than with SPICE-like simulators. Utilizing an automatically generated SystemC interface, our simulation kernel analyzes mixed analog/digital circuits where the digital...
This paper presents the theoretical analysis, design and simulation of a single phase single stage boost dc-ac converter powered from PV array. The main attribute of the boost inverter topology is the fact that it generates an ac output voltage larger than the dc input one, depending on the instantaneous duty cycle. This paper proposes an accurate solar panel simulation to incorporate the temperature...
The nonlinear circuit models for power BAW resonators, which reproduce both amplitude-frequency and intermodulation effects, are presented. The “frequency warping” effect in high Q circuit simulation is analyzed.
This brief proposes a novel multi-objective heuristic. It is a transformation of a mono-objective heuristic into a multi-objective one by addition of an archive and some non dominance computing routines. Performances of the proposed heuristic are demonstrated thru test functions. An application to the optimal sizing of a class AB second generation CMOS current conveyor is presented. Comparison with...
The testing and verification technology for system HDL models, focused to the significant improvement of the quality of design components for digital systems on chips and reduction the development time (time-to-market) by using the simulation environment, testable analysis of the logical structure HDL-program and the optimal placement of assertion engine is proposed.
An accurate new and simple numeral modeling of nano-scale dual gate n- MOSFET device in the ballistic region is presented. The model and the analysis is performed with channel length below 20 nm where electron transport is predominantly ballistic. In this paper a new developed modeling approach based on Boltzmann transport equation and Poisson equation in an n-channel nanoscale double-gate MOSFET...
Different models have been proposed for modeling the IV-characteristics of diodes. In this paper we present a simple model, which describes both the IV- and the temperature characteristics of a SOI-pin-diode and can be used for different diodes types. It is well known that the DC-characteristics of a diode can be approximated by the simple Shockley-equation. However, when a more exact modelling of...
This paper addresses the automatic generation of RF integrated inductors model. In this work the double p-model is used as a way of characterizing the inductor behaviour over a frequency range beyond the self-resonant value. For the evaluation of the model element values analytical expressions based on technology parameters as well as on the device geometric characteristics are used. The use of a...
In complementary input differential pair circuits, the topology CMOS uses both an nMOS differential pair and a pMOS differential pair connected in parallel however, it produces variations in the transconductance over the input common mode range. To avoid the problem of transconductance variations, a new structure, consists of two op-amps one n-type and the other p-type controlled by a digital control...
Multiresolution or wavelet analysis is widely used in advanced data compression algorithms, and some approaches applied this technique in describing electromagnetic fields. The main goal of the application of MRA is its flexibility, i.e., since the details of the electromagnetic field are not distributed equally over different parts of the system, thus locally different resolution level can be applied...
The battery state of charge (SOC) is an important parameter for the electrical vehicle. Its estimation is an important function of the electric vehicle battery management system. In this paper, definition of SOC is discussed; fundamental characteristics are also introduced. Many kinds of estimation tactics of SOC are described at the moment. The advantages and disadvantages of these methods during...
A major demand of the aviation industry is the reduction of emissions in combination with cost efficiency improvement. One possible approach to face this challenge is the replacement of the conventional auxiliary power unit by a fuel cell system within a “more electric aircraft” design. In order to integrate a fuel cell system into the grid architecture of modern aircraft new protection arrangements...
Refined Oil demand has great influence on the planning, operation and control of Refined Oil systems. A combined forecasting model based on the principle of gray theories was put forward to optimize Refined Oil demand forecasting models. The example shows that combined gray forecasting model can overcome the disadvantages of individual model, raise the precision.
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