Analog TCXO using cubic functional voltage generator

Kurogo, S.; Matsumoto, Yoshinori; Ohshima, T.

doi:10.1109/freq.1996.559899

Cited by 10 publications

(2 citation statements)

References 4 publications

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“…It acts as a reference frequency in the cellular phone. [1,2] It can also be used in the timing synchronization and clock recovery. In these applications the stringent request of phase noise is needed.…”

Section: Introduction (Heading 1)mentioning

confidence: 99%

Study of phase noise in VCXO with inversion-mode varactors

Kao

Liau

2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

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Voltage controlled crystal oscillators (VCXO) using CMOS varactors are investigated. The varactor is operated in the so-called inversion mode (I-Mode) with source and drain bounded together. Its capacitance is evaluated by the HSPICSFourier methodology. The performances of capacitance under small-signal and large-signal operations are classified. Then the frequency tuning and the related phase noise are explored. It is found that the larger the tuning coefficient has, the worse the phase noise has in I-mode varactor. The chip is fabricated by the TSMC 0.35um CMOS process. The total area including pad is 1.358 1.350 mm 2 and the current consumption in the core circuit is 300uA.

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Section: Introduction (Heading 1)mentioning

confidence: 99%

Study of phase noise in VCXO with inversion-mode varactors

Kao

Liau

2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

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“…TCXO using cubic functional voltage generator is widely used, but it requires each VCXO which is controlled has similar temperature-frequency performance [2]. DTCXO dose not require the similar temperature-frequency performance, so DTCXO has an advantage in a sense.…”

Section: Introductionmentioning

confidence: 99%

A novel design of DTCXO with low phase noise

Chen

Zhou

Zhao

2010

2010 IEEE International Frequency Control Symposium

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On the basis of the conventional method, the digital techniques for temperature compensation to VCXO always deteriorate the phase noise of the VCXO badly. And the essential cause for the deterioration of phase noise is the frequent variation of control voltage to the VCXO [1]. This paper explores a novel non real-time digital technique for temperature compensation to the VCXO, which makes the compensation voltage more stable with slower and evener change. Lastly, the temperature-frequency performance of the DTCXO is improved greatly, and the phase noise is improved greatly at the same time.

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A digitally temperature-compensated crystal oscillator with minimized phase-shifts

Moh¹,

J.H.Nam²,

Koh³

et al.

Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234)

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4bstract -The phase-jump's in the output signal, due to discrete nature of the load capacitance, has been analyzed for DTCXO with on-chip capacitor-switch arrays. And a one-chip DTCXO with minimized phase-jump's has been fabricated on a standard 0.25pm CMOS process. The effect of phase-jumps is minimized, by employing charge-pump circuits. And it shows trimming accuracy of about O.Zppm, which is not degraded by process variations.

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Analog TCXO using cubic functional voltage generator

Cited by 10 publications

References 4 publications

Study of phase noise in VCXO with inversion-mode varactors

Study of phase noise in VCXO with inversion-mode varactors

A novel design of DTCXO with low phase noise

A digitally temperature-compensated crystal oscillator with minimized phase-shifts

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