Analog Front End Design Strategy

[johnsmittysmitty]

Hello EEVblog forum,

So I am able to analyze filters for cutoff, frequency response etc.  But where I get lost is practical analog filter application for the best results.

Lets say I have a signal at 1khz that I want to filter out and sample why can't I put a bandpass with pass band at 900Hz and 1100Hz.  Whenever I do this my signal seems to become too distorted.

Also, what order to do gain/filtering.

Any practical advice to filter placement will help.

Thank you
John

[Dave]

You can do that and you should be able to get good results. How about you post some scope screenshots and explain what you were expecting to achieve.

[rjeberhardt]

Lets say I have a signal at 1khz that I want to filter out and sample why can't I put a bandpass with pass band at 900Hz and 1100Hz.  Whenever I do this my signal seems to become too distorted.

Is your signal a pure sine wave?  Any other waveform will be distorted by that filter.

Russell.