The 2 oscillator circuits beneath are well suited for making use of crystal oscillators in collection or parallel mode: High-repetition-charge and significant-energy picosecond regenerative amplifier determined by only one bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with a top quality component of larger than one million https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html