The 2 oscillator circuits down below are well suited for applying crystal oscillators in collection or parallel manner: High-repetition-amount and substantial-electrical power picosecond regenerative amplifier according to a single bulk Nd:GdVO4 crystal A timing reference incorporating an individual-crystal-silicon micromechanical resonator with a quality component of greater than one... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html