Why a crystal oscillator needs no tunned circuits
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Explanation:
The slope of the crystals impedance above shows that as the frequency increases across its terminals. ... Also, since the crystal can operate at either its series or parallel resonance frequencies, a crystal oscillator circuit needs to be tuned to one or the other frequency as you cannot use both together.
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As you know, for the circuit to produce a sustained sinusoidal output (oscillate), the phase shift around the positive feedback loop must be 0° and the gain around the loop must equal unity (1).
because crystal oscillator is a good conduct of electricity
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