Does anyone here have experience with those very tiny, cylindrical "watch" crystals, usually 32-and-some-odd kHz? They are available in a few other relatively low frequencies as well from DigiKey and Mouser.
I'm trying to use a 100kHz crystal of this type as a timebase for a frequency synthesizer that has a loop frequency of 10kHz. These crystals don't work in the usual single inverting gate circuit, so I'm using two HC04 gates in tandem and an HC390 to divide by 10. The problem is that I'm seeing all kinds of phase noise, both as edge jitter on a 'scope display and sideband crud on the 'scope's FFT utility. Any help is appreciated.
I'm trying to use a 100kHz crystal of this type as a timebase for a frequency synthesizer that has a loop frequency of 10kHz. These crystals don't work in the usual single inverting gate circuit, so I'm using two HC04 gates in tandem and an HC390 to divide by 10. The problem is that I'm seeing all kinds of phase noise, both as edge jitter on a 'scope display and sideband crud on the 'scope's FFT utility. Any help is appreciated.