Crystal oscillators are loosely divided from the frequency they perform at and whether or not they are basic oscillators—work with the frequency marked on the can or at even multiples of that (overtone oscillators). As you'll be able to see with the graph below, crystals have two resonant points. A https://expressbookmark.com/story18947926/helping-the-others-realize-the-advantages-of-bulk-crystal-oscillator