Journal ArticleDOI
Flicker Noise Up-Conversion due to Harmonic Distortion in Van der Pol CMOS Oscillators
TLDR
A quantitative analysis of the effect in Van der Pol oscillators using the framework of the impulse sensitivity function (ISF) shows that most of the up-conversion efficiency results from the first harmonic of the ISF, which is not perfectly in quadrature to the output voltage waveform.Abstract:
Harmonic content modulation of the oscillator output voltage can contribute to flicker noise up-conversion in LC-tuned oscillators. The paper reports a quantitative analysis of the effect in Van der Pol oscillators using the framework of the impulse sensitivity function (ISF). It is shown that most of the up-conversion efficiency results from the first harmonic of the ISF, which is not perfectly in quadrature to the output voltage waveform, and from the first harmonic of the transistor current, which is slightly lagging the voltage waveform. A closed-form expression of 1/f3 phase noise in voltage-limited LC-tuned oscillator is derived that is in good agreement with circuit simulations. The paper also shows that the values of both phase shifts are determined by the non-linearity of the active element and are linked to the relevant oscillator parameters, i.e., excess gain and tank quality factor.read more
Citations
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Journal ArticleDOI
Class-D CMOS Oscillators
Luca Fanori,Pietro Andreani +1 more
TL;DR: Compared with the commonly used class-B/C architectures, the optimal class-D oscillator produces less phase noise for the same power consumption, at the expense of a higher power supply pushing.
Journal ArticleDOI
A 1/f Noise Upconversion Reduction Technique for Voltage-Biased RF CMOS Oscillators
TL;DR: A method to reduce a flicker (1/f) noise upconversion in voltage-biased RF oscillators by exploiting different behaviors of inductors and transformers in differential-and common-mode excitations is proposed.
Journal ArticleDOI
A Low-Flicker-Noise 30-GHz Class-F 23 Oscillator in 28-nm CMOS Using Implicit Resonance and Explicit Common-Mode Return Path
TL;DR: A millimeter-wave frequency generation stage aimed at minimizing phase noise (PN) via waveform shaping and harmonic extraction while suppressing flicker noise upconversion via proper harmonic terminations using nanoscale short-channel transistors is presented.
Journal ArticleDOI
Suppression of Flicker Noise Up-Conversion in a 65-nm CMOS VCO in the 3.0-to-3.6 GHz Band
TL;DR: This work presents an alternative technique that does not rely on resonant elements and does not affect both start-up margin and 1/f2 phase noise.
Journal ArticleDOI
Analysis and Minimization of Flicker Noise Up-Conversion in Voltage-Biased Oscillators
TL;DR: In this paper, an improved voltage-controlled oscillators (VCO) architecture is proposed, where a segmented transconductor tailors the excess gain depending on the operating range to ensure that $1/f$ noise up-conversion remains minimal over the tuning range.
References
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TL;DR: In this article, the MOS transistors with ION-IMPLANTED CHANNELS were used for CIRCUIT SIMULATION in a two-and three-tier MOS structure.
Journal ArticleDOI
A general theory of phase noise in electrical oscillators
Ali Hajimiri,Thomas H. Lee +1 more
TL;DR: In this paper, a general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically time-varying nature of all oscillators.
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A filtering technique to lower LC oscillator phase noise
TL;DR: Based on a physical understanding of phase-noise mechanisms, a passive LC filter was found to lower the phasenoise factor in a differential oscillator to its fundamental minimum in this paper.
Proceedings ArticleDOI
RF-CMOS oscillators with switched tuning
TL;DR: In this article, the authors proposed a tuning method for fully integrated CMOS oscillators with a wide enough tuning range to reliably cover process variations, without compromising current drain or phase noise.
Journal ArticleDOI
Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise
Andrea Mazzanti,Pietro Andreani +1 more
TL;DR: The analysis of phase noise is extended to encompass a general harmonic oscillator, showing that all phase noise relations previously obtained for specific LC oscillator topologies are special cases of a very general and remarkably simple result.