Oh i'm sorry,i know crystal oscillator can also use negative feedback but i mean we want to use a method in which a mechanism cancel other that cause a frequency instability, and specially we use an electrical resonator and want to determine which part in- for example LC - oscillator circuit cause more instability, i know first we must use experimental method but what is your idea? Which part have must proportion in producing instability?
Transistors? Resonator? Feedback network? Or the others?