The circadian clock of Neurospora broadly regulates gene expression and is synchronized with the environment through molecular responses to changes in ambient light and temperature. It is generally understood that light entrainment of the clock depends on a functional circadian oscillator comprising the products of the wc-1 and wc-2 genes as well as those of the frq gene (the FRQ/WCC oscillator...

In this paper, we propose a design of a current controlled Quadrature Sinusoidal Oscillator. The proposed circuit employs three optimized Multi-output translinear second generation current conveyer (MCCII). The oscillation condition and the oscillation frequency are independently controllable. The proposed Quadrature Oscillator frequency can be tuned in the range of [198 261 MHz] by a simple va...

An analysis is presented in this contribution to describe the steady-state amplitude of a CMOS LC Colpitts oscillator, as well as its response to small interferences. The problem of signal dependency of noise sources is also addressed. The general conclusions of the analysis are applicable to most LC oscillators. The procedure to perform a general analysis for an arbitrary LC oscillator is outl...

In this work, two radio frequency (RF) voltagecontrolled oscillators (VCOs) are evaluated to determine feasibility for use in a high data rate wireless LAN. Designs are presented for a Colpitts oscillator and a differential L-C oscillator operating at 10GHz. The circuits are to be fabricated in a 3.3V 47GHz SiGe BiCMOS process, pushing the limits of the technology. Simulated phase noises of -95...

A MMIC colpitts oscillator in push-push configuration is presented using InGaP/GaAs HBTs. The output at the second harmonic enhances the frequency range while preserving the well-known advantages of the Colpitts concept. Moreover, additional features like enhanced load-pull immunity and inherent frequency divider functionality are included. The MMIC VCO reaches state-of-the-art phasenoise perfo...

The fact that Chua's circuit can be physically decomposed into a sinusoidal oscillator coupled to an active voltage-controlled nonlinear resistor is demonstrated. The sinusoidal oscillator is the beating heart of Chua's circuit and many novel implementations can be obtained by using di!erent sinusoidal oscillator engines. In particular, inductorless realizations can be derived not by replacing ...

this paper presents a comprehensive case study on electro-mechanical analysis of mems[1] variable capacitors. using the fundamental mechanical and electrical equations, static and dynamic behaviors of the device are studied. the analysis is done for three different modes, namely: dc (static mode), small signal ac and large signal regime. a complete set of equations defining dynamic behavior of ...

Dynamic stabilization of an optomechanical oscillator Report Title Quantum optomechanics offers the potential to investigate quantum effects in macroscopic quantum systems in extremely well-controlled experiments. In this paper we discuss one such situation, the dynamic stabilization of a mechanical system such as an inverted pendulum. The specific example that we study is a “membrane-in-the-mi...

A turn control strategy is proposed in order to improve environmental adaptability of a quasi-passive walking robot by utilizing a mechanical oscillator. The target trajectory of the mechanical oscillator is determined by online planning of its period, phase, amplitude and angle of the central axis of oscillation. The motion of the mechanical oscillator is always entrained with the rocking moti...

This paper presents a comprehensive case study on electro-mechanical analysis of MEMS[1] variable capacitors. Using the fundamental mechanical and electrical equations, static and dynamic behaviors of the device are studied. The analysis is done for three different modes, namely: dc (static mode), small signal ac and large signal regime. A complete set of equations defining dynamic behavior of ...