Techniques minimize the phase noise in crystal oscillator circuits

Poddar, Ajay K.; Rohde, Ulrich L.

doi:10.1109/fcs.2012.6243701

Cited by 4 publications

(2 citation statements)

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“…Currently, in the commercial market, small-sized CSACs are represented by a single suitable model, Microsemi SA.45s Chip Scale Atomic Clock, the basic characteristics of which meet the requirements of the WiMUST project specifications [3]. According to the description, the device has an accuracy that is three orders of magnitude higher than that of OCXO oscillators [4], and two orders of magnitude higher that of the TCXO oscillators [5,6]. It consumes less than 120 mW, weighs 35 g, and occupies no more than 16.5 cm 3 .…”

Section: Chip-scale Atomic Clocks Integrated Into the Uwa Modemmentioning

confidence: 99%

Underwater Acoustic Modems with Synchronous Chip-Scale Atomic Clocks for Scalable Tasks of AUV Underwater Positioning

Кебкал¹,

Кебкал²,

Glushko³

et al. 2019

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Accurate time synchronization of the nodes of digital underwater acoustic (UWA) networks is necessary for the effective use of information obtained from various kinds of underwater sensors over a vast water area. The sensors of autonomous underwater vehicles (AUV) are widely used to address new challenges. One of them is time synchronization of sensors on mobile carriers, as well as synchronization of the clocks on mobile nodes of UWA networks, for example, teams of AUVs that perform coordinated and/or cooperated operations. The paper presents theresults of the experiments on using UWA modems for AUV positioning, namely, UWA modems with chip-scale atomic clocks (CSAC) that allow accurate measurements of delays in propagation of UWA signals and, thus, accurate estimation of ranges to their georeferenced sources. In addition, the accuracy of CSAC operation in various situations as well as positioning accuracy of AUVs having UWA modems with integrated CSACs are analyzed based on the experimental results. Also given are practical recommendations on how to "discipline" (steer) CSACs and provide their phase synchronization with a source of timekeeping signals.

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Section: Chip-scale Atomic Clocks Integrated Into the Uwa Modemmentioning

confidence: 99%

Underwater Acoustic Modems with Synchronous Chip-Scale Atomic Clocks for Scalable Tasks of AUV Underwater Positioning

Кебкал¹,

Кебкал²,

Glushko³

et al. 2019

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“…( 2) represent higher order terms in the expansion, including, for example, harmonics. Noise suppression using a nonlinear resonator occurs when the resonator is driven hard enough so that the change in the frequency due to the dependence of the frequency on amplitude is comparable to the line width of the linear resonance spectrum, given by the dissipation in the resonator [12], [13], [15], [16]. For a high-Q resonator the line width is much less than the frequency itself, so that the resonator remains weakly nonlinear under these conditions, even though the resonator response for a fixed drive level and frequency may show complex behavior such as a multiplicity of solutions [9].…”

Section: Strongly Nonlinear Wide Bandpassmentioning

confidence: 99%

Frequency Precision of Oscillators Based on High-Q Resonators

Kenig,

Cross

2015

Preprint

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We present a method for analyzing the phase noise of oscillators based on feedback driven high quality factor resonators. Our approach is to derive the phase drift of the oscillator by projecting the stochastic oscillator dynamics onto a slow time scale corresponding physically to the long relaxation time of the resonator. We derive general expressions for the phase drift generated by noise sources in the electronic feedback loop of the oscillator. These are mixed with the signal through the nonlinear amplifier, which makes them cyclostationary. We also consider noise sources acting directly on the resonator. The expressions allow us to investigate reducing the oscillator phase noise thereby improving the frequency precision using resonator nonlinearity by tuning to special operating points. We illustrate the approach giving explicit results for a phenomenological amplifier model. We also propose a scheme for measuring the slow feedback noise generated by the feedback components in an open-loop driven configuration in experiment or using circuit simulators, which enables the calculation of the closed-loop oscillator phase noise in practical systems.

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