On Mon, Jan 02, 2006 at 06:09:17PM +0200, Sergei Steshenko wrote:

> In other words, tunable xtal is a bad xtal by definition.

There are no such things as 'tunable' and 'untunable' xtals.
*Every* xtal behaves has a parallel or series LC circuit near
resonance (depending on how it's used) and can be detuned by
adding some capacitance. That by itself does not make it less
stable.

Even PLLs are often implemented using a VCXO (voltage controlled
xtal oscillator). You get the stability of the external reference,
and outside the loop bandwidth, the quality of an xtal. Standard
practice in all sorts of telecomm equipment, and the stability
requirements there are orders of magnitude more strict than for
audio.

-- 
FA

 


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