Crystal oscillator start-up circuit
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United States of America Patent
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Dec 6, 2016
Grant Date -
Apr 14, 2016
app pub date -
Oct 14, 2014
filing date -
Oct 14, 2014
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Abstract
A crystal oscillator start-up circuit capable of reducing a start-up time of a crystal oscillator is disclosed. The crystal oscillator start-up circuit is provided with a crystal oscillation unit including a crystal oscillator, a converter and an external oscillator. The crystal oscillation unit generates an output signal corresponding to the impedance characteristic of the crystal oscillator. The converter converts the output signal of the crystal oscillation unit to a voltage signal. The external oscillator outputs to the crystal oscillation unit an oscillation signal whose frequency is adjusted by the voltage signal to approach a resonance frequency of the crystal oscillator.
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