I am designing a low-pass anti aliasing filter. I have set my cutoff frequency to be at 500Hz, and my sampling frequency at 1000Hz, but I'm not that far yet.
I designed a 4th order butterworth low-pass filter, but am having some issues at the output with some small offset.
Is this due to my op-amp's input offset voltage?
Here is my schematic.
I run a transient analysis and find there to be about 50mV of offset on my output.
Finally, here is a picture of the AC analysis frequency response. It matches my criteria.
My question really is why am I getting this offset in my final signal and how can I get rid of it? Do I need to compensate for component non-ideal values?