Crystals higher than thirty MHz (nearly >two hundred MHz) are generally operated at series resonance where the impedance appears at its minimum and equivalent into the collection resistance. For these crystals the collection resistance is specified ( Superior-frequency crystals are generally Minimize in the shape of a simple rectangle or https://singnalsocial.com/story4016176/helping-the-others-realize-the-advantages-of-smd-crystal-oscillators