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Basic use of crystal in microcontroller

Discussion in 'Electronic Basics' started by joshua, Feb 21, 2006.

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  1. joshua

    joshua Guest

    I want to know about crystal and why we use in electrnoic circuit.
    what is the basic function/use of crystal
  2. joshua

    joshua Guest

    Thanks John Popelish
  3. A crystal is a very narrow band filter element based on the
    vibrational resonance of a slice of quartz and the fact that applying
    voltage to the slice causes it to change shape, and changing the shape
    by mechanical force generates voltage.

    They are normally used as the frequency determining element in
    oscillator circuits, by connecting them in a signal loop, in series
    with a gain block. This combination generates an endless echo with a
    duration equal to the period of the quartz resonance. The stability
    of quartz oscillators is measured in parts per million, whereas the
    stability of oscillators based on RC time constants or inductor
    capacitor resonances is measured in percent.

    Here is a Google hint. If you want to learn how something works (and
    not see a lot of sales adds) add the word tutorial to any subject search.

    For instance, try putting these key words into the Google search box:
    [quartz crystal oscillator tutorial]
  4. John Fields

    John Fields Guest

    On Tue, 21 Feb 2006 11:43:10 -0500, John Popelish


    "Endless echo". That's nice. :)
  5. Thanks. I think it is descriptive, too. Unlike RC oscillators, that
    generate each half cycle from scratch, just stacked after the previous
    half cycle, some energy from previous cycles goes back around to make
    up the next cycle in resonator oscillators. I think it is a
    distinction worth making.
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