Results 181 to 190 of about 30,784 (218)

On Phase Noise in Quadrature Cross-Coupled Oscillators

2005 IEEE International Symposium on Circuits and Systems, 2005
A cross-coupled relaxation oscillator has two outputs of the same frequency, which are in quadrature. In this paper a comparative study of the phase noise in a cross-coupled relaxation oscillator is given. We present a high level (system) study of the oscillator and analyse the oscillator stability.
Luís Bica Oliveira, Ahmed Allam, Igor M. Filanovsky, Jorge R. Fernandes   +3 more
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On the numerical quadrature of highly-oscillating integrals II: Irregular oscillators

IMA Journal of Numerical Analysis, 2005
The purpose of the present paper is to delve deeper into highly-oscillatory quadrature and to analyse the behaviour of the Filon quadrature for irregular oscillators of the form \[ I_g[f]:= \int^1_0 f(x) e^{i\omega g(x)}\,dx, \] where \(g\) is a real, nonzero function, \(f\) is a complex-valued function, both sufficiently smooth, and \(w\gg 1\).
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A Complementary-Coupled CMOS LC Quadrature Oscillator

IEICE Transactions on Electronics, 2008
SUMMARY A novel CMOS LC quadrature oscillator (QO) whichadopts complementary-coupling circuitry has been proposed. The perfor-mance improvement in I/Q phase error and phase noise of the proposedQO, is explained in comparison with conventional QOs. The proposedQO is implemented in 0.18μm CMOS technology along with conventionalQOs. The measurement result
Yun, SJ Yun, Seok-Ju, Yoon, DY Yoon, Dae-Young, Lee, SG Lee, Sang-Gug   +2 more
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A 3.2-to-7.3GHz Quadrature Oscillator with Magnetic Tuning

2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 2007
A quadrature oscillator employs a transformer-capacitor network as an energy tank. Frequency tuning is done by varying the transformer magnetic field via the ratio of currents in the two windings. Realized prototypes have a 3.2 to 7.3GHz frequency tuning range, a phase noise FOM of 176.5dB at 3.2GHz, 170.5dB at 6.4GHz, and 164dB at 7GHz, all calculated
Giuseppe Cusmai, Matteo Repossi, Guido Albasini, Francesco Svelto   +3 more
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Off-Resonance Oscillation, Phase Retention, and Orthogonality Modeling in Quadrature Oscillators

IEEE Transactions on Circuits and Systems I: Regular Papers, 2016
Two important drawbacks of parallel coupled LC quadrature oscillators (P-QOSC) which have not heretofore been addressed thoroughly in the literature are obviated simultaneously in this paper. The first, has to do with the inevitable off-tune operation of the tank which results in quality factor $(Q)$ degradation, and hence, phase noise ...
Ali Nikoofard, Siavash Kananian, Ali Fotowat-Ahmady   +2 more
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Geometrical analysis of LC quadrature oscillator

2008 51st Midwest Symposium on Circuits and Systems, 2008
By applying basic geometrical rules we analyze an LC quadrature oscillator. Various oscillation modes and their stabilities are investigated and impacts of mismatches on the quadrature accuracy are calculated.
M.E. Heidari, A. Mirzaei, R. Bagheri, S. Chehrazi, A.A. Abidi   +4 more
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A 1 GHz quadrature sinusoidal oscillator

Proceedings of the IEEE 1995 Custom Integrated Circuits Conference, 2002
A low-noise integrated 1 GHz quadrature sinusoidal oscillator that uses lossy planar inductors is presented. The oscillation frequency is digitally-controlled over a 200 MHz range centered at 1.1 GHz, and the measured phase noise at a 100 kHz offset from a 1 GHz carrier is -87 dBc/Hz.
R. Duncan, K. Martin, A. Sedra
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Quadrature generation techniques in CMOS relaxation oscillators

2012 IEEE International Symposium on Circuits and Systems, 2012
Shunt and series-coupling techniques for quadrature generation are applied to CMOS relaxation oscillators. The 2.4GHz quadrature oscillators are designed and simulated in a UMC 0.18µm CMOS process. The shunt-coupled oscillator consumes a current of 12mA from a supply of 1.8V and achieves a phase noise of −99.4dBc/Hz @ 1MHz offset.
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Digital triangular wave quadrature oscillator

2017 27th International Conference Radioelektronika (RADIOELEKTRONIKA), 2017
Digital oscillators are a useful electronic system that can be used for different applications. Usually the frequency and amplitude stability is important. There are oscillators with different type of output signal e.g. sinusoidal, square etc. Some of them needs floating point multiply or look-up table etc.
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Very low frequency quadrature oscillator

Review of Scientific Instruments, 2000
We propose a low-cost, practical, quadrature oscillator with a period, Tq, which may be very long (Tq⩾1 s). We illustrate this design with an oscillator that produces two quadrature sinusoidal waves with a 1 s period. This design can be modified to provide signals of any shape by adjusting the value of one or more resistors.
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