The two oscillator circuits underneath are ideal for working with crystal oscillators in sequence or parallel mode: Superior-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 an outstanding variable of bigger than one million an... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html