I am looking to create a high q passive notch filter using a crystal. I am not very familiar with crystals, hoping that someone who's had a similar experience can enlighten. I know crystals are mostly used for generating signals, but I mainly need to filter. My working frequency is 40KHz
I know there are such parameters as series resonance and parallel resonance.
- How do I pick the right crystal for the job? The datasheets don't always state whether the crystal is designed for series or for parallel operation.
- What is the actual typical difference in frequency between the two?
- Is it possible to use the same crystal both to generate my signal and also to notch filter it? I read something about "pulling" the resonant frequency.
- How would you build a notch filter with a crystal?
Thank you so much.