The 2 oscillator circuits under are suitable for applying crystal oscillators in sequence or parallel method: Significant-repetition-price and significant-electrical power picosecond regenerative amplifier according to only one bulk Nd:GdVO4 crystal A timing reference incorporating only one-crystal-silicon micromechanical resonator with a top quality variable of bigger than one millio... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html