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- W1578652232 abstract "Previous developments on a 2.1MHz quartz have demonstrated that thermal, ageing and shock performances are improved by at least one order of magnitude compared to a 32kHz quartz. The temperature behavior is a flat cubic function, and therefore positive and negative deviations with respect to the reference temperature are compensated. A field test on 20 watch samples containing an oscillator built around this quartz showed that over a 3-year period, the maximum deviation is less than 3 seconds/year. Note that these results are obtained without any temperature compensation scheme. As the power consumption of a 2.1 MHz quartz oscillator (2.3/spl mu/A) is not compatible with the power consumption of standard watch oscillator circuits (<300nA), the 2.1MHz quartz oscillator is periodically powered for a short time and locks a continuously-running 32MHz, 200nA quartz oscillator. While short term precision is provided by the 32MHz oscillator, longer-term deviations are corrected by the periodically activated 2.1MHz oscillator. The chosen periodicity is 10 minutes, corresponding to the thermal constants in a watch.< <ETX xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>></ETX>" @default.
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- W1578652232 date "2002-12-17" @default.
- W1578652232 modified "2023-09-26" @default.
- W1578652232 title "A microprocessor-based analog wristwatch chip with 3 seconds/year accuracy" @default.
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- W1578652232 doi "https://doi.org/10.1109/isscc.1994.344713" @default.
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