Hi all,
I'm trying to filter out a "single" frequency (200 KHz). i.e. a ultra narrow band pass filter. It works quite well using a simple high-Q LC filter but with the inductor and capacitor tolerances it is hard to tune it to that exact frequency and I need it to be very precise. I have a microcontroller on the board so ideally I want to be able to tune it for the highest amplitude.
I know that op-amps can replace inductors. So I think I should be able to adjust (through a digital pot) the resistor in the op-amp circuit that simulates/replaces the inductor.
Would such solution work?
Can I get a very high-Q response by replacing the inductor with a op-amp circuit?
If yes, how?
Many thanks
