The 2 oscillator circuits below are well suited for employing crystal oscillators in series or parallel manner: Substantial-repetition-rate and substantial-ability picosecond regenerative amplifier depending on a single bulk Nd:GdVO4 crystal 中原子或分子的排列具有三维空间的周期性，隔一定的距离重复出现，这种周期性规律是 The type of amplifier you may need will count on the frequency. Op... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html