I have a signal that is 3mV range, I like to use a bandpass filter for this signal at 800Khz to eliminate unwanted signals (i.e. noise etc) I have the following questions:
- Since the amplitude of my signal is small, shall I amplify first? (Just pass through a high speed opamp) and than filter it?
- I have looked at TI's filter design software and I see that I can use an opamp based filter, is this better compared to RLC filters?
- If I use the opamp filter, I can amplify the signal, can I directly feed the 3mV signal to the filter and get 300mV type signal and filter at the same time? (100x gain and filter, sounds ambitious to me)
- Do I need to take care of the impedance of my signal? (I have no idea about the impedance of the source of this signal, is it important for designing the filter)