A filtering technique to lower LC oscillator phase noise

Hegazi, Emad; Sjöland, Henrik; Abidi, A.A.

doi:10.1109/4.972142

Cited by 863 publications

(342 citation statements)

References 21 publications

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“…At that frequency, Z S takes its maximum value, which means that the impedance Z out looking down from the drain of M 2 and equal to [1 + (g m2 + g mb2 )r o2 ]Z S + r o2 will also be maximized. According to the authors in [14,15], for single-ended Colpitts, the impedance (magnitude) seen at the source of M 1 should be maximum at the oscillation frequency of the oscillator topology. Thereby, in order to have the maximum value of Z out at the oscillation frequency, the resonance frequency f filter of the bandpass filter at the source of M 2 should be equal to the oscillation frequency.…”

Section: Chlis D Pepe and D Zitomentioning

confidence: 99%

“…Because of its noise filtering action, it is referred therein [14][15][16] as noise filter. Moreover, we will observe that there is an optimum inductance value (L 3 ) for which the oscillator circuit topology exhibits a minimum PN, and we will calculate such an optimum inductance that leads the noise filter to resonate at the oscillation frequency, as mentioned in Section 1.…”

Section: Noise Filtermentioning

confidence: 99%

“…Moreover, the technique of noise filter was proposed in [14][15][16] for the reduction of PN due to the tail transistor in CMOS LC oscillators. In particular, it was capable to reduce the up-conversion of low-frequency noise.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, it was capable to reduce the up-conversion of low-frequency noise. It consists of replacing the tail transistor with a band-stop filter, referred therein [14][15][16] as noise filter, in a common-source cross-coupled differential pair oscillator operating close to 1.1 GHz and fabricated in 0.35-μm CMOS technology.…”

Section: Introductionmentioning

confidence: 99%

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Analyses and techniques for phase noise reduction in CMOS Colpitts oscillator topology

Chlis

Pepe²,

Zito

2015

Circuit Theory & Apps

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SUMMARYThis paper reports the analyses of three techniques for phase noise reduction in the complementary metaloxide semiconductor (CMOS) Colpitts oscillator circuit topology. Namely, the three techniques are inductive degeneration, noise filter, and optimum current density. The design of the circuit topology is carried out in 28-nm bulk CMOS technology. The analytical expression of the oscillation frequency is derived and validated through circuit simulations. Moreover, the theoretical analyses of the three techniques are carried out and verified by means of circuit simulations within a commercial design environment. The results obtained for the inductive degeneration and noise filter show the existence of an optimum inductance for minimum phase noise. The results obtained for the optimum bias current density technique applied to a Colpitts oscillator circuit topology incorporating either inductive degeneration or noise filter show the existence of an optimum bias current density for minimum phase noise. Overall, the analyses show that the adoption of these techniques may lead to a potential phase noise reduction up to 19 dB at a 1-MHz frequency offset for an oscillation frequency of 10 GHz.

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Section: Chlis D Pepe and D Zitomentioning

confidence: 99%

Section: Noise Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analyses and techniques for phase noise reduction in CMOS Colpitts oscillator topology

Chlis

Pepe²,

Zito

2015

Circuit Theory & Apps

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“…The Ao independent current source represents the small signal periodic source that perturbs the oscillator (the p(t) function). The Ct capacitor is added to filter out the influence of the p(t) perturbing signal as proposed in [20]. Initially we chose Ct = 0 (this is equivalent to remove the capacitor) and perform the Floquet analysis.…”

Section: Numerical Resultsmentioning

confidence: 99%

Computation of all the Floquet eigenfunctions in autonomous circuits

Brambilla

Gajani

2007

Circuit Theory & Apps

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SUMMARYAnalysis methods based on the Floquet theory have gained a large interest to compute small signal and noise effects in non-autonomous and autonomous circuits (oscillators). A reliable and straightforward method to compute all the eigenfunctions related to the Floquet analysis is discussed here. The method has been implemented in a circuit simulator and tested on several circuits. Numerical results are presented.

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Phase‐Locked Loops

Grebennikov¹

2011

RF and Microwave Transmitter Design

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A filtering technique to lower LC oscillator phase noise

Cited by 863 publications

References 21 publications

Analyses and techniques for phase noise reduction in CMOS Colpitts oscillator topology

Analyses and techniques for phase noise reduction in CMOS Colpitts oscillator topology

Computation of all the Floquet eigenfunctions in autonomous circuits

Phase‐Locked Loops

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