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Why Load Resistance is used in Crystal oscillator ?

Discussion in 'Datasheets, Manuals and Component Identification' started by Praveen2.0, Dec 1, 2018.

  1. Praveen2.0


    Nov 12, 2018
    Why 1M Ohm resistor is used across in xtalo and xtali Pins (or Across Crystal Oscillator?
  2. Praveen2.0


    Nov 12, 2018
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    In the example circuit shown there, it provides a DC path that will ensure oscillation. The inverter shown there is typically a buffered inverter that internally has three inverting stages. If you study CMOS design, providing a feedback path like this to an odd number of inverting gates (>1) will ensure oscillation. The crystal will slow the oscillation to a frequency where it has a minima of series impedance, which may be the fundamental or an overtone.
    Cannonball and hevans1944 like this.
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