The 2 oscillator circuits underneath are suited to working with crystal oscillators in sequence or parallel method: Significant-repetition-amount and substantial-electrical power picosecond regenerative amplifier according to a single bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with an excellent issue of bigger than a milli... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html