The 2 oscillator circuits under are well suited for employing crystal oscillators in collection or parallel method: Higher-repetition-fee and high-electrical power picosecond regenerative amplifier dependant on just one bulk Nd:GdVO4 crystal A timing reference incorporating an individual-crystal-silicon micromechanical resonator with an outstanding factor of greater than a million in ... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html