The 2 oscillator circuits beneath are well suited for making use of crystal oscillators in collection or parallel method: Superior-repetition-price and significant-power picosecond regenerative amplifier determined by only one bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with an outstanding variable of bigger than one millio... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html