Multiphase LC oscillators

Romanò, L.; Levantino, Salvatore; Samori, Carlo; Lacaita, A.L.

doi:10.1109/tcsi.2006.876415

Cited by 80 publications

(58 citation statements)

References 18 publications

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“…The recent work by Romano et al [17] extends the theory developed by the same authors for the quadrature case [23] to an arbitrary number of phases. While [17] is a very significant step forward, it still employs a linear time invariant (LTI) approach in the study of phase noise, which is known to be wanting in general (see e.g., [26]- [28]).…”

Section: Phase-noise Analysismentioning

confidence: 70%

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Analysis and Design of a Double-Quadrature CMOS VCO for Subharmonic Mixing at $Ka$-Band

Mazzanti

Sacchi

Andreani

et al. 2008

IEEE Trans. Microwave Theory Techn.

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Abstract-In this paper, we analyze the potentials of a four-phase 14-GHz CMOS voltage-controlled oscillator, tailored to a subharmonic receiver, for signal processing at -band. When mild phase accuracies between in-phase and quadrature down-converted signals are required, the four-phase oscillator displays roughly the same phase noise figure-of-merit as quadrature oscillator counterparts. However, the operation at half-frequency leads to an improved performance due to a higher quality factor of the tuning varactors, and because the local oscillator circuitry and signal path run at different frequencies, relaxing coupling issues. A detailed time-variant analysis of phase noise in multiphase oscillators is introduced and validated by both simulations and experiments.Prototypes realized in a 65-nm technology occupy an active area of 0.5 mm 2 and show the following performances: a 26% frequency tuning range (from 12.2 to 15.9 GHz), maximum phase error from 4 of 2 , and a phase noise of 110 dBc/Hz at 1 MHz from 14 GHz, while consuming 18 mA from 0.8-V supply.

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Section: Phase-noise Analysismentioning

confidence: 70%

“…3, much in the same way as two coupled oscillators are used to generate two synchronous signals apart [16], [17]. According to Barkhausen criterion, the ring assures permanent oscillation provided the loop gain is equal to 1 and the phase delay between two consecutive oscillators, satisfies the relation .…”

Section: Lo Generationmentioning

confidence: 99%

Analysis and Design of a Double-Quadrature CMOS VCO for Subharmonic Mixing at $Ka$-Band

Mazzanti

Sacchi

Andreani

et al. 2008

IEEE Trans. Microwave Theory Techn.

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“…Assuming no mismatch Δ 1 =Δ 2 , β 1 =β 2 and ϒ 1 =ϒ 2 , the phase difference between the oscillators are given by (10) From (10) it is possible derive the values in Table I, which are in accordance with the conclusions of [8], that a system with N coupled differential oscillators produces outputs with a phase shift of π/N. To obtain quadrature outputs one of the couplings should be direct and other crossed.…”

Section: Fig 3 the Block Diagram Of The High-level Model With The Pmentioning

confidence: 88%

“…Where the oscillators are represented by a first-order phase lock loop (PLL) -gray box -, with the instantaneous frequency (8). The coupling is modeled by two gain blocks, G 21 and G 12 ; and the conversion from voltage to current -performed by the coupling capacitors C X -are modeled by differential blocks with gain C X .…”

Section: Fig 3 the Block Diagram Of The High-level Model With The Pmentioning

confidence: 99%

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A High-Level Model for Capacitive Coupled RC Oscillators

Casaleiro

Oliveira

2012

Technological Innovation for Value Creation

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Abstract. In this paper a high-level model is proposed for quadrature oscillators that are based on two RC oscillators with capacitive coupling. The capacitive coupling technique has the advantages of being noiseless and not increasing the power requirements, which are important features for low power receivers. This coupling technique was already study for LC oscillators but not for RC oscillators. Simulations showed that the behavior of capacitive coupling in RC oscillators is different than for LC. In opposition to what was expected, in RC oscillators, the oscillation frequency increases almost linearly and proportional to the coupling capacitances. This behavior can be explained by the presented model. Simulations are presented to validate the model in respect to the oscillation frequency and to the output phases of the oscillator.

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Phase noise analysis in CMOS differential Armstrong oscillator topology

Chlis

Pepe²,

Zito

2016

Circuit Theory & Apps

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SUMMARYThis paper reports a phase noise analysis in a differential Armstrong oscillator circuit topology in CMOS technology. The analytical expressions of phase noise due to flicker and thermal noise sources are derived and validated by the results obtained through SpectreRF simulations for oscillation frequencies of 1, 10, and 100 GHz. The analysis captures well the phase noise of the oscillator topology and shows the impact of flicker noise contribution as the major effect leading to phase noise degradation in nano-scale CMOS LC oscillators.

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Multiphase LC oscillators

Cited by 80 publications

References 18 publications

Analysis and Design of a Double-Quadrature CMOS VCO for Subharmonic Mixing at $Ka$-Band

Analysis and Design of a Double-Quadrature CMOS VCO for Subharmonic Mixing at $Ka$-Band

A High-Level Model for Capacitive Coupled RC Oscillators

Phase noise analysis in CMOS differential Armstrong oscillator topology

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