The 2 oscillator circuits below are suited to applying crystal oscillators in sequence or parallel mode: Large-repetition-level and large-ability picosecond regenerative amplifier determined by a single bulk Nd:GdVO4 crystal A timing reference incorporating an individual-crystal-silicon micromechanical resonator with an excellent factor of greater than a million in addition to a https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html