Quadrature voltage-controlled oscillators (VCOs) with current-weight-average and voltage-weight-average phase-adjusting architectures are studied. The phase adjusting equalizes the oscillation frequency to LC-resonant frequency. merits of equalization explained by using Leeson's noise equation impulse sensitivity function (ISF). VCOs fabricated 180-nm TSMC CMOS show low-phase-noise performances...

A novel synchronization behavior, nonlocal chaotic phase synchronization, is investigated. For two coupled Rossler oscillators with only one forced by an injected periodic signal, the phase of the unforced oscillator can be locked to the phase of the periodic signal while the forced one is well unlocked by the signal; in a chain of coupled chaotic oscillators with nearest coupling, the phase of...

<p>The voltage-controlled oscillator (VCO) is the primary device in phase-locked loop (PLL) to produce local frequency. The excessive phase noise of VCOs cause PLL performance loss. This paper proposes design and optimization low power consumption for a 180 nm N-channel metal-oxide semiconductor NMOS VCO applications with P-channel PMOS varactors spiral inductors. At 2 V supply voltage, o...

This work surveys techniques based on classical density functionals for modeling the quantum dispersion of physisorbed hydrogen at 77K. Two such techniques are examined in detail. The first is based on the "open ring approximation" (ORA) of Broukhno et al., and it is compared with a technique based on the semiclassical approximation of Feynman and Hibbs (FH). For both techniques, a standard cla...

in this study, a new efficient semi-analytical method is introduced to give approximate solutions of strongly nonlinear oscillators. the proposed method is based on combination of two different methods, the multi-step homotopy analysis method and spectral method, called the multi-step spectral homotopy analysis method (msham). in this method, firstly, we propose a new spectral homotopy analysis...

As device size scales down, there have been challenges to design conventional analog circuits, such as low voltage headroom and the low intrinsic gain of a device. Although ever-decreasing device channel length in CMOS technology has mainly negative effects on analog circuits, it increases device speed and reduces the power consumption of digital circuits. As a result, time-based signal process...

There have been many investigations of mutual synchronization and multimode oscillation in coupled oscillators1)–4). Endo et al. have reported the multimode oscillations in various types of the coupled oscillators networks1). The synchronization phenomena in resistively coupled oscillators have been reported2)–4). In particular, we have reported synchronization phenomena observed from N oscilla...

color metallography is a useful method for characterizing microstructures of steels with multiple phases. in this paper, application of three different color etching techniques for a bainitic-martensitic steel is reported. comparisons between the results showed that 10% na2s2o5 aqueous solution was the best etchant for distinguishing martensite, bainite and ferrite phases. the obtained microgra...