A fully monolithic 5.8 GHz low phase noise coupled VCO network for phased-array systems

Cordeau, David; Mellouli, Dorra; Paillot, Jean‐Marie; Mnif, Hassène; Loulou, Mourad

doi:10.1007/s10470-014-0437-3

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…In order to describe the phase noise accurately, one must take into account the fact that any os- cillator is a frequently time-varying system. The time-variant approach involved here is capable of accurately assessing the impacts on the phase noise of stationary and cyclostationary noise sources, in contrast to phase noise systems that consider linearity and time-invariance [95]. The general noise source of the circuit can be categorized into two, which are interference and device noise.…”

Section: ) Jitters and Phase Noise In Ring Vcomentioning

confidence: 99%

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A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

Sivaraaj,

Majeed

2023

IEEE Access

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Voltage-controlled Oscillator (VCO) is a prominent part that has been used to generate a stable frequency for the high-frequency transceiver system. This survey encompasses a comparative analysis of two commonly used VCO architectures: the Ring VCO and LC-VCO. The Ring VCO has been constructed with the collection of ring delay cells. Moreover, the LC-VCO utilizes inductors, capacitors, fine-tuning circuits, coarse-tuning circuits to generate frequency. Furthermore, this study investigates an in-depth exploration of VCO structures, operational principles, advantages, limitations, and performance metrics. In addition, it evaluates performance parameters, including operating frequency range, phase noise, figure of merit, and tuning techniques. This research suggests that based on the application and its requirements, the VCO performance parameters need to be varied. This survey employs diverse types of VCO, and its design methods. Implications for future research and study of VCO design and integration are discussed.

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Section: ) Jitters and Phase Noise In Ring Vcomentioning

confidence: 99%

“…Conventional NMOS LC-VCO is modified, which connected tail current with a current source. This tail capacitance can minimize the tail current highfrequency portion and tail node voltage fluctuations [95], [115].…”

Section: A Nmos Cross-coupled Lc Oscillatormentioning

confidence: 99%

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

Sivaraaj,

Majeed

2023

IEEE Access

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“…The coupled systems of oscillators are also used for the formation of directional pattern of microwave antennas in digital communication systems [5,6]. The coupled Gunn diode oscillators are applied in communication systems as low-noise coherent radio receiving devices of active transmitting antennas, etc.…”

Section: Introductionmentioning

confidence: 99%

Solution of Reduced Equations of Injection-Locked Oscillator

Rapin

2019

Radioelectron.Commun.Syst.

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Oscillators with the primary tone synchronization and based on the frequency-divider mode have been considered in this study. The paper proposes a generalized model of injection-locked oscillator using the linear polynomial approximation of nonlinear characteristic of its amplifying element, and a new analysis technique based on peculiarities of the oscillator operation in injection-locked mode. These peculiarities imply that the oscillation amplitude can be considered as steady-state at an arbitrary instantaneous value of phase shift and that the curvature of phase characteristic of the oscillator decreases with the rise of synchronization signal amplitude within certain limits. The development of the new technique involved the use of the linear approximation method of reduced equations of injection-locked oscillator and the small parameter method. The new technique is insensitive to the form of nonlinear terms, and it allows us to obtain analytical solutions of reduced equations having different nonlinear terms that depend on the oscillator operation mode. This technique features small errors and essentially simplifies the investigation of injection-locked oscillators and their systems. The experimental test confirmed its high efficiency.

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“…and replacing the admittance transfer function by its expression in (9), then isolating the terms in cos s can extract the dynamics equation for the amplitude and phase of oscillator 1 as(11) …”

mentioning

confidence: 99%

Dynamics of high-power coupled nonlinear oscillator arrays for electronic beam steering technique: case of the triode based van der Pol oscillator

Tsefack,

Tegnitsap,

Fotsin

et al. 2024

Phys. Scr.

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This paper presents the dynamics of coupled nonlinear oscillator arrays (CNOAs) as phase shifter for electronic beam steering technique. The proposed phase shifter uses oscillators of van der Pol type with a fifth-order nonlinear resistance and is built on the two architectures based injection-locked oscillator array (ILOAs) and coupled oscillator arrays (COAs). The dynamics equations of the phase shifter are proposed in the frequency and time domain. With the help of mathematical tools such as bifurcation diagrams, maximum Lyapunov exponent and Hilbert transform, important cartography of different oscillating states is deduced over large range of system parameters. Different behavior of the CNOAs including chaos, 2D-torus, multistability, locked and unlocked states are depicted. The phase shift between output voltages of each pair of coupled oscillators is presented for both architectures. A detailed analysis of locked states shows that the required phase shift is synthesized by slightly varying the frequency of the injected signal, or simply by detuning the free-running frequencies of the edge oscillators in equal but opposite directions. The proposed circuit of the phased shifter is built using the original van der Pol oscillator based on a vacuum triode. The maximal phase shift reaches 63° and 75° respectively for ILOAs and COAs. With the presence of triode in the circuit, the output voltage of each oscillating element in the array reaches 100 V around 60 KHz and is boosted by increasing the value of the triode bias potential to more than 420 V. This, therefore, increases the total power dissipation of a single oscillator in the array to more than 47 dB (50.12 W). This circuit is a candidate for high-power electronics beam steering at ultrasonic frequency.

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A fully monolithic 5.8 GHz low phase noise coupled VCO network for phased-array systems

Cited by 9 publications

References 8 publications

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

Solution of Reduced Equations of Injection-Locked Oscillator

Dynamics of high-power coupled nonlinear oscillator arrays for electronic beam steering technique: case of the triode based van der Pol oscillator

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