Crystal oscillator provides low noise

Posted on Jan 1, 2013

The oscillator delivers an output of high spectral purity without any substantial sacrifice of the usual stability of a crystal oscillator. The crystal in addition to determining the oscillator's frequency, is used also as a low-pass filter for the unwanted harmonics and as a bandpass filter for the sideband noise.

Click here to download the full size of the above Circuit.

The noise bandwidth is limited to less than 100 Hz. All higher harmonics are substantially suppressedâ€”60 dB down for the third harmonic of the 4-MHz fundamental oscillator frequency.

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