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Within this article the fundamental limit of Q of an antenna with non-Foster elements will be proposed. The Chu's fundamental radiation Q-limit of small antennas has been revisited for non-Foster small antennas, where non-Foster elements are assumed to be within the radiansphere. In the case, where non-Foster circuits are not part of the antenna itself, the fundamental limit for matching a high-Q...
This paper presents design, modeling and simulation of spiral MEMS inductor, that can be used in RF circuits. The spiral inductor is designed on silicon substrate using MEMS technology to reduce the metal and substrate losses of inductor. At first, MEMS spiral inductor simulates with Intellisuite software then model of inductor is extracted. Also, the model of inductor is simulated by ADS and results...
This paper presents a complete model of an on-chip wireless power transmission (WPT) system, which is essential to design a WPT link that can operate at maximum power efficiency within the design constraint of a particular application. In the process of WPT modeling, a unified model of planar inductor was proposed, which captured both PCB and on-chip inductor characteristics. Also, the mutual inductance...
Modeling of multi-walled carbon nanotube (MWCNT)-based capacitors is performed in this paper. Their equivalent circuit model is modified with the impacts of quantum capacitance as well as kinetic inductance treated in an appropriate manner. Further, both effective capacitance and quality factor of the MWCNT-based capacitors are predicted even at ultrahigh frequencies, and their self-resonance frequencies...
This paper presents a method for reconfiguring the bandwidth of Bulk Acoustic Wave (BAW) ladder filters by adding switchable inductors to their shunt resonators. Inductance values are controlled by selecting the number of turn in spiral inductor using micro-electro-mechanical (MEMS) switches. For this purpose, a MEMS inductor has been designed, fabricated and characterized in terms of inductance value,...
In this paper, moving least-squares approximation is firstly applied to synthesize on-chip spiral inductors. 41 circular inductors with different number of turns and different radii were fabricated. Their equivalent circuit parameters in double-?? topology were extracted through linear regression. Moving least-squares approximation is employed to construct parameters values in any geometric dimensions...
This paper presents a novel low-power high-Q active inductor, which exploits only an integrated transformer and a MOSFET in common drain configuration. The operating principle is explained and the equivalent input impedance is derived. The case study for millimeter-waves low-power applications has been implemented by using a standard 90-nm CMOS process. The active inductor provides an equivalent inductance...
Aiming at the practical applications of novel wireless energy transfer, the mathematical model for wireless energy transfer devices based on intermediate frequency resonant is established in this paper. Based on the electromagnetic fields sine-band theory, the transfer scheme using lumped parameters is designed. It is proved that using the resonator with a high quality factor value and coupling coefficient...
An ultra-wideband CMOS VCO with tuning range of 3.8~7.4 GHz is presented, using tunable active inductor (TAI). The inductance of TAI can be tuned from 0.34~0.61 nH by active tunable resistor, and exhibits a quality factor of about 90. The VCO is designed in a 0.18 um CMOS technology with power dissipation of around 29.1 mW and phase noise (PN) of -92.05 dBc/Hz. PLL-based and LC-based phase noise reduction...
This paper reports a new advanced design of the active circuit named boot-strapped inductor (BSI), which realizes an equivalent inductor with an high quality factor (Q). In particular, a new small-signal circuit model is proposed for an accurate design at high frequency in a modern RF CMOS process, also by taking into account the issues of an algorithmic and low-power consumption circuit design. A...
This paper presents a methodology, based on regularization theory, to find, in the whole geometric parameter space and for any value of mean inductance, the planar spiral inductor with optimum quality factor. The full-wave electromagnetic simulations of these inductors have been applied to the development of a parameterized circuit model. This model provides an accurate wide-band frequency characterization...
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