Inductor coil of the highest possible $$\mathbf {Q}$$

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A Low-Noise RF Voltage-Controlled Oscillator Using On-Chip High-Q Three-Dimensional Coil Inductor and Micromachined Variable Capacitor

A RF voltage-controlled oscillator (VCO) employs an onchip, high-Q, three-dimensional (3-D) coil inductor and micromachined variable capacitor for frequency tuning. Unlike conventional spiral inductors, the 3-D inductor minimizes the substrate loss and achieves a record Q of 30 at 1 GHz. The micromachined variable capacitor achieves a 15% tuning range with a nominal 2pF capacitance and a Q valu...

Adaptive Steffensen-like Methods with Memory for Solving Nonlinear Equations with the Highest Possible Efficiency Indices

The primary goal of this work is to introduce two adaptive Steffensen-like methods with memory of the highest efficiency indices. In the existing methods, to improve the convergence order applied to memory concept, the focus has only been on the current and previous iteration. However, it is possible to improve the accelerators. Therefore, we achieve superior convergence orders and obtain as hi...

Tunable Coupled Inductor Q-Enhancement for Parallel Resonant LC Tanks

A tunable transformer-based Q-enhancement method for monolithic inductors used in parallel resonant LC tanks is presented. The Q of the inductor that forms the transformer primary is enhanced by cancelling the voltage drop across the series loss resistance of the primary with a voltage of opposite polarity that is induced by a current in the secondary. The circuit allows dc voltage control of Q...

Low Voltage High-Q CMOS Active Inductor For RF Applications

In this paper, an improved design of a high-Q factor CMOS active inductor operating in the mid MHz frequency range is introduced. Analysis of equations has been used to gain insight into behavior of the active inductor. Moreover, based on these equations and their analysis, ways of improving quality factor are discussed. Performance improvement based on this new design coupled with use of feedb...