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how can i generate a sine wave from a square wave?

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wdd

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how can i generate a sine wave from a square wave?
the frequency of sine wave should between 12MHz and 14MHz.

I'm not familiar with clock, so need your help.

Best Regards,
wdd
 

since the square wave is the sum of sine waves, so u can filter the square wave with a BPF
 

pll seems simpler than mentioned methods.
 

thx for all your comments,
Since eng_Semi says use BPF and IanP recommends LPF,
which type filter should be used? LPF or BPF?
then how to define the passband ripple or dominant pole?

Regards,

Added after 7 minutes:

artem said:
pll seems simpler than mentioned methods.
Click to expand...

I had probed a signal from the loop of an available PLL delay cell, but it is not sinewave(seems relatively better than square) and with a big DC offset to half power supply.
Do you have some suggestions?
In fact, we still can not make a choice between PLL and crystal oscillator.

Regards,
 

artem said:
pll seems simpler than mentioned methods.
Click to expand...
I had the same question in the past. Could you recommend a reference PLL design for converting a square wave to a sine wave of the same freqency? PLL might have better spectral purity than, say a 4-pole LPF.
 

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