The microcomputer compensated crystal oscillator (MCXO)

Bloch, M.; Meirs, M.; Ho, Jia Shin

doi:10.1109/freq.1989.68853

Cited by 20 publications

(4 citation statements)

References 3 publications

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“…The two harmonics of the SC cut crystal have different temperature behavior. Mixing these two frequencies results 1 Power consumption of a TI MSP430 and a ChipCon CC2420 radio chip as found on the TMote Sky platform [4] Measuring the temperature using two AT-cut crystals, which is similar to our basic approach of measuring drift, has been done by Satou et al [5]. Nevertheless, all the prior work focuses on ways to generate a stable frequency for the purpose of building accurate oscillators.…”

Section: Related Workmentioning

confidence: 99%

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Low-power high-accuracy timing systems for efficient duty cycling

Schmid

Friedman

Charbiwala

et al. 2008

Proceeding of the Thirteenth International Symposium on Low Power Electronics and Design - ISLPED '08

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Time keeping and synchronization are important services for networked and embedded systems. High quality timing information allows embedded network nodes to provide accurate time-stamping, fast localization, efficient duty cycling schedules, and other basic but essential functions -all of which are required for low power operation.In this paper we present a new type of local clock source called Crystal Compensated Crystal based Timer (XCXT) and a number of novel algorithms that effectively utilize it to achieve low power consumption in wireless sensor networks. The XCXT has timing accuracies similar to timers based on temperature compensated crystal oscillators (TCXO) but has a lower implementation cost and requires less power. Our initial 8MHz prototype unit, using the simplest algorithm, achieves an effective frequency stability of ±1.2ppm and consumes only 1.27mW. On the other hand, commercially available TCXOs with similar stability can cost over 10 times as much and consume over 20mW.In addition to the prototype, we will present algorithms that will improve the XCXT's power consumption by at least 48%, depending on application and environmental conditions. We will also show how XCXT's power efficiency can be improved even further by employing clocks at different frequency when different time granularities are required by an application.

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Section: Related Workmentioning

confidence: 99%

“…In order of increasing significance: (1) In finitebandwidth systems the precise moment of the syncronization symbol is imprecisely defined. (2) In embedded applications where network time maintainence is one of several tasks on the processor, computational and time-to-service latency is not necessarily constant.…”

Section: Introductionmentioning

confidence: 99%

Low-power high-accuracy timing systems for efficient duty cycling

Schmid

Friedman

Charbiwala

et al. 2008

Proceeding of the Thirteenth International Symposium on Low Power Electronics and Design - ISLPED '08

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“…In spite of the fact that the amazed zones are very narrow, uses of resonators with "dips" becomes impossible. The presence of failures and complexities of struggle against them have caused serious interest to use frequencies difference of SC-cut harmonics as a thermosensor [1,2,8,9]. This decision has appeared technologically stable, that has overbalanced in developers' opinion a potential LFNM2005, 15-17September2005, Yata'Crmea, Ukraine advantage of a high steepness of a mode "B" characteristic.…”

Section: Oscillation Type Choosingmentioning

confidence: 96%

“…Some variants of dual-mode resonators may be used. In all cases the reference oscillation (FR) is C-mode in SC or AT-cut resonator, but as a sensor mode (FT) may be used one of the next: * B-mode in SC-cut (or similar orientated) resonator [3, 4, 5,] * Face chear low frequency oscillation * Anharmonic of C-mode * Frequency difference between the 3-rd and tripled 1-st harmonics of C-mode [1,2,8,9] In principal the relative steepness of F-T curve can be made as much as need by subtraction of constant frequency "support" (this may be named as change of nominal value). However, it usually does not change a "signal/noise" ratio of thermosensor and it is not so essential, as a high absolute steepness.…”

Section: Oscillation Type Choosingmentioning

confidence: 99%

Principles of dual-mode crystal oscillators designing

Kosykh

Proceedings of LFNM 2005. 7th International Conference on Laser and Fiber-Optical Networks Modeling, 2005.

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This is the consequence of the fact that dual-mode oscillator may be used as self-temperature sensing device with excellent static and dynamic measuring resolution. In such devices the best volume coincidence of reference resonator and thermosensor is achieved. However dual-mode excitation of single crystal resonator is vexatious because of complex oscillations interaction in resonator and excitation circuit. In this paper the complex of problems related to dual-mode oscillation excitation is investigated.

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Microelectronic System Design in the Field of Time‐Average‐Frequency: A Paradigm Shift

Xiu¹

2015

From Frequency to Time‐Average‐Frequency

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The microcomputer compensated crystal oscillator (MCXO)

Cited by 20 publications

References 3 publications

Low-power high-accuracy timing systems for efficient duty cycling

Low-power high-accuracy timing systems for efficient duty cycling

Principles of dual-mode crystal oscillators designing

Microelectronic System Design in the Field of Time‐Average‐Frequency: A Paradigm Shift

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