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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

    Praveen2.0

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

    Praveen2.0

    7
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    Nov 12, 2018
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
    2,676
    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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