The two oscillator circuits underneath are ideal for working with crystal oscillators in series or parallel manner: High-repetition-fee and superior-energy picosecond regenerative amplifier based upon a single bulk Nd:GdVO4 crystal A timing reference incorporating a single-crystal-silicon micromechanical resonator with a top quality component of larger than one million plus a https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html