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Crystal stabilized relaxation oscillator

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  • Nicolae Sfetcu
    Crystal stabilized relaxation oscillator This circuit uses an LT1011 voltage comparator to form a crystal stabilized relaxation oscillator. This circuit uses a
    Message 1 of 1 , Feb 15, 2001
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      Crystal stabilized relaxation oscillator

      This circuit uses an LT1011 voltage comparator to form a crystal stabilized relaxation oscillator. This circuit uses a standard RC-comparator multivibrator circuit with the crystal connected directly across the timing capacitor. Because the free running frequency of the circuit is close to the crystal's resonance, the crystal "steals" energy from the RC, forcing it to run at the crystal's frequency. In circuits of this type, it is important to ensure that enough current is available to quickly start the crystal resonating while, simultaneously, maintaining an RC time constant of appropriate frequency. Typically, the free running frequency should be set 5% to 10% above crystal resonance with a resistor feedback value calculated to allow 100 microamps into the capacitor-crystal network. This type of circuit is not recommended for use above a few hundred kHz because of comparator delays.

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