Hi,
Recently I'm working on a project and I used a mux before one channel ADC.There is some problem with anti aliasing filter. For example, sigma delta adc has modulate frequency Fd, Data rate Frequency Fdr and my signal bandwidth is Fc. Max bandwidth of anti aliasing is Fd/2 according to Nyquist sample rate and this is the problem bother me.In multiplexer existence,I think the max anti aliasing bandwidth is Fd/2N because for each channel it's like down sampling every N samples. It's also like for each channel the sample rate is Fd/N except that the sampling rate is Fd in 1/N cycle sampling period and 0 in the other (N-1/)N period. Am I right?
Best Regards!