Crystal oscillators are loosely divided via the frequency they function at and whether or not they are basic oscillators—work with the frequency marked around the can or at even multiples of that (overtone oscillators). As you can see from your graph underneath, crystals have two resonant points. A reduced impedance https://thebookmarkking.com/story18915543/the-smart-trick-of-bulk-crystal-oscillator-that-no-one-is-discussing