The 2 oscillator circuits beneath are well suited for employing crystal oscillators in series or parallel method: Large-repetition-rate and significant-electricity picosecond regenerative amplifier according to only one bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with an outstanding factor of more substantial than one milli... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html