hello
i have some little questions to ask to the more experienced users...
In lots of designs with adc's i see that anti aliasing filter is missing ... it's normal? For example , i want to sample a 500Hz signal ( i expect to do make a ecg maybe in the future ) , it's mandatory to put an anti aliasing filter or i can live without it ? ( i mean putting in 8 filters it's so boring ^^ , otherwise i can put a standalone adc and analog mux to share the filter ... taking care off course of the switching transitions ...
Or, instead of that could i do it all digital (dsp or messy loop) one inside my mcu ??
( i was thinking of doing a 60hz notch inside but can i use it too to perform the antialiasing AFTER sampling???)
Can the CMSIS libraries do it and will they work in uvision?
this part is a little bit confusing to me.
thanks for your help to understand better this obscure part ...
reading If the input frequency can be too high and going by an asssumption that the input frequency will not be too high and finding out later that "noise happens"
Erik
Yes, it is critical to make sure that the system can be trusted - capturing false signals is bad. Real bad. Extremely bad if in medical system.
Without a low-pass filter, a 100kHz signal can be sampled as a 5Hz signal and completely fool the person looking at the curve.