The two oscillator circuits underneath are ideal for applying crystal oscillators in series or parallel manner: Large-repetition-amount and high-electricity picosecond regenerative amplifier dependant on just one bulk Nd:GdVO4 crystal A timing reference incorporating an individual-crystal-silicon micromechanical resonator with an excellent aspect of greater than a million in addition ... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html