FAST START-UP CRYSTAL OSCILLATOR
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United States of America Patent
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Issued Date -
Sep 30, 2021
app pub date -
Mar 27, 2020
filing date -
Mar 27, 2020
priority date (Note) -
Granted
status (Latency Note)
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Abstract
An apparatus injects a start clock to a crystal at the beginning to increase an overall start up speed of the crystal. The apparatus relies on an impedance change inside the crystal itself instead of searching for a synchronization on the yet small crystal oscillation. The apparatus includes an oscillator (separate from the crystal) to search for the crystal's resonance frequency by detecting the crystal's impedance change. Once the frequency of the oscillator matches the crystal's resonance, there is significant change in the crystal's impedance. Using that information, the apparatus can lock the oscillator frequency at the crystal resonance frequency and inject the clock with high efficiency.
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