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Is there much difference between an analog vs digital anti-aliasing filter?

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razorfin
razorfin 2017-10-16
关闭： John D'Errico 2017-10-16
I am trying to use MATLAB to simulate a device that measures electric current, passes it through an analog butterworth filter (anti-aliasing), and then does some digital filtering and computation. I know the latter part of the problem, but I'm confused about how one can simulate the analog filter portion. My experience is not in filtering so I was hoping to get a nudge from someone in the right direction.
The butterworth filter should be order 4 with cutoff frequency fc. There is an example of creating an analog butterworth using the butter function here: https://www.mathworks.com/help/signal/ref/butter.html. But I don't believe you can apply this analog filter to the incoming sampled (digital) data? Would I need to use the function bilinear? Or should I just create a digital butterworth filter instead. I don't have any real requirements for ripple or anything.
Thank you.

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