On Mon, 2 Jan 2006, fons adriaensen wrote:
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.
Unfortunately they tend to have a very very narrow range of tunablility.
Their precise purpose is to be a very high Q oscillator and the higher the
Q, the narrower the bandwidth. Now if you want to tune to 1 part in 10^5 it
may be doable.
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.
Precisely. so the amount of tuning needed is very very small.
--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED]
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