The 2 oscillator circuits under are well suited for utilizing crystal oscillators in collection or parallel mode: Significant-repetition-charge and superior-electrical power picosecond regenerative amplifier based on only one bulk Nd:GdVO4 crystal A timing reference incorporating an individual-crystal-silicon micromechanical resonator with a top quality issue of more substantial than ... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html