The 2 oscillator circuits below are appropriate for using crystal oscillators in sequence or parallel mode: Significant-repetition-rate and substantial-ability picosecond regenerative amplifier depending on one bulk Nd:GdVO4 crystal A timing reference incorporating a single-crystal-silicon micromechanical resonator with a high quality issue of larger sized than one million as well as https://bookmarkusers.com/story18779717/bulk-crystal-oscillator-for-dummies