Low power timekeeping

Bloch, M.; Meirs, M.; Ho, Jia Shin; Vig, J.R.; Schodowski, S.

doi:10.1109/freq.1989.68856

Cited by 11 publications

(3 citation statements)

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“…The simplest way to lower the floor on achievable duty cycle is to reduce the clock skew, which in turn requires stabilizing the crystal using a range of simple, complex, or exotic mechanisms [5,7,8,9,17,26,34,35]. We find, however, that a commercially-available temperature-compensated crystal oscillator (TCXO) like the DS32KHz [3] offers sufficient stability -on the order of ±2 ppm indoors -and draws only 2 µA, offering a lower bound on the duty cycle of just DC = 2 × r skew = 0.0004%.…”

Section: Low-power Communicationsmentioning

confidence: 99%

Putting the software radio on a low-calorie diet

Dutta

Kuo

Lédeczi

et al. 2010

Proceedings of the 9th ACM SIGCOMM Workshop on Hot Topics in Networks

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Modern software-defined radios are large, expensive, and power-hungry devices and this, we argue, hampers their more widespread deployment and use, particularly in low-power, size-constrained application settings like mobile phones and sensor networks. To rectify this problem, we propose to put the software-defined radio on a diet by redesigning it around just two core chips -an integrated RF transceiver and a Flash-based, mixed-signal FPGA. Modern transceivers integrate almost all RF front-end functions while emerging FPGAs integrate nearly all of required signal conditioning and processing functions. And, unlike conventional FPGAs, Flash-based FPGAs offer sleep mode power draws measured in the microamps and startup times measured in the microseconds, both of which are critical for low-power operation. If our platform architecture vision is realized, it will be possible to hold a software-defined radio in the palm of one's hand, build it for $100, and power it for days using the energy in a typical mobile phone battery. This will make software radios deployable in high densities and broadly accessible for research and education.

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Section: Low-power Communicationsmentioning

confidence: 99%

Putting the software radio on a low-calorie diet

Dutta

Kuo

Lédeczi

et al. 2010

Proceedings of the 9th ACM SIGCOMM Workshop on Hot Topics in Networks

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“…The temperature range over which watches would remain accurate however is very limited [1]. Though temperature compensation has been adopted in wristwatch quartz oscillators, the timekeeping accuracy is not better than 1ppm [2].…”

Section: Introductionmentioning

confidence: 99%

A novel method for low-power, high-precision timekeeping based on MCXO

Chen

Zhang

et al. 2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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The watch crystal oscillator can achieve very-lowpower time-keeping, even less than 1μW, which best overall accuracy with temperature-compensation has remained at about 1 ppm. For comparison, the timing system using Microprocessor Compensated (AT or SC-cut) Crystal Oscillator is capable of providing at least 10-to 100-times improvement in time-keeping accuracy, milliseconds-per-day, with the penalty of requiring considerably more power, about tens of milliwatts. In this paper a novel method for time-keeping based on MCXO is described, which is to simultaneously meet the needs of very-low-power and high-precision timing.I.

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“…Recent trends in frequency standards have been to aggressively shrink the size of rubidium atomic clocks and attempt to develop batch manufacturing techniques to lower the production cost [2,3,4,5,6,7,8,9,10,11,12]. For crystal oscillators, every possible refinement has been applied in the last few decades to improve the long-term accuracy and temperature stability [13,14,15,16,17,18], and to reduce the power consumption of oven-controlled devices [19,20,21,22,23]. New solutions are needed to realize low-cost, portable frequency sources with improved accuracy.…”

Section: List Of Figuresmentioning

confidence: 99%