How to Convert 20 MHz Square Wave Quartz Oscillator Output to Sine Wave?

Hi,

I need to design a 20 MHz sine wave oscillator. Square wave is unfortunately not acceptable. How could I create a sine wave from the easily-available square wave quartz oscillators? 

The common way is to use a tuned circuit, usually the crystal  operated between its series and parallel resonance (where it looks like an inductor), and is tuned by placing capacitors across it. You need some gain in the system to meet the criteria for self sustaining oscillation, and there are many configurations for achieving this. See a brief explanation crystal oscillatorsIf you can remove a portion of the harmonics of a 20MHz square wave by filtering then you may also get  a sine wave output. It depends on how much harmonic distortion you can tolerate.What is your application,cheers,Richard

A tuned circuit built with inductor and capacitor can also work

You can use this simple schematic, but without crystal. You can change the values of C1, X1 and C2 to get different frequencies. Also you can try to change the transistor.Giovanni

The simplest method of converting a square wave to a sine wave is by filtering. Basically, a square wave consists of a fundamental frequency with a lot of higher harmonics. If the harmonics can be removed, then a sine wave of the fundamental frequency remains.

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