1) Analog filters are designed with R, L and C where Digital filters are designed via coding ..
2) To change anything in Analog filter, whole design has to be changed whereas in Digital filters, you just need to change the code ..
3) Digital filters are more reliable and easy to design as compare to Analog filters ..
4) A high order Analog filter may get bulky whereas a high order Digital Filter doesn't get bulky as it is designed via code ..
5) Analog filters are much more affected by surrounding noise as compared to Digital Filters ..
The example shows the need for a more precise discrimination. Digital filters involve both time and amplitude discrete signal processing. Signal processing in switched capacitor filters is time discrete and amplitude continuous. The latter feature qualifies it as analog. But because it's discrete time, the same z-domain calculation methods as for digital filters have to be applied.have used a switched capacitor filter IC to make an excellent Butterworth lowpass filter and a notch filter. Is it analog or digital? I think it is digital.
I have used a switched capacitor filter IC to make an excellent Butterworth lowpass filter and a notch filter. Is it analog or digital? I think it is digital.
can you please elaborate more . do analog filters have merits over digital ones?
Digital filters are as precise as its clock rate can be, generaly few more than crystal oscillator near to 0,001%, differently from analog filters that are limited to the combination of multiple components precision, which idividually varies from 0,1% for resistors up to 2-5% for capacitors.
This fact ensures a better accuracy expected on digital filters rather than analog filters.
Thanks for your effort. I am reading the file now,it is good.To Saad Mahsoub:
Perhaps the following link can answer some of your questions:
http://complextoreal.com/wp-content/uploads/2013/01/filters.pdf
Except for the need to have a reasonable microcontroller system to accomplish the filtering digitally, I see no more drawbacks.
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