Low frequencies filtering | Cypress Semiconductor
Low frequencies filtering
I have been testing the behavior of the digital filter operating as a LPF, I noticed that the attenuation goes beyond the cutoff frequencies, is the normal ? For instance, using a 6khz LPF signals, frequencies around 600 hz are being attenuated. Actually, I want to use a LPF with 40 hz as cutoff frequency, to accomplish this I need to use a higher "virtual" cutoff frequency ? Moreover, when I use 0.04khz as cutoff, 1hz signals don't pass through the filter. Any advices ?