The 2 oscillator circuits below are appropriate for using crystal oscillators in sequence or parallel mode: Large-repetition-amount and higher-electricity picosecond regenerative amplifier based on just one bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with an outstanding variable of bigger than one million and also a resonant https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html