Xtal filter bandwidth


William Kimber
 

Would it be practical to use varicap diodes to vary bandwidth of xtal
filters? Instead of using fixed value caps it is obviously possible to
replace or use in parallel with fixed capacitor between xtals to ground.

However would the low Q of varicaps and or the resistor used to feed the
DC to them upset the Q too much. Also would it effect the termination
impedances so that the matching was not matched.

Cheers,
Will

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