E
eliben
- Jan 1, 1970
- 0
Hello all,
I have an ADC that samples some analog signal at 1 Msps. The samples
are then processed by a digital logic / software. To avoid aliasing, I
must make sure that signals entering the ADC have no harmonics at > 500
KHz. Is the only way to do it by an analog lowpass filter (i.e. RC)
before the ADC ? I assume that there is no way whatsoever to filter out
the unwanted frequencies digitally after the ADC, since the ADC
sampling itself already got distorted because of aliasing, is this
right ?
And yet, in some places I've seen mentioned digital lowpass filters for
anti-aliasing. How is this possible ?
Thanks
I have an ADC that samples some analog signal at 1 Msps. The samples
are then processed by a digital logic / software. To avoid aliasing, I
must make sure that signals entering the ADC have no harmonics at > 500
KHz. Is the only way to do it by an analog lowpass filter (i.e. RC)
before the ADC ? I assume that there is no way whatsoever to filter out
the unwanted frequencies digitally after the ADC, since the ADC
sampling itself already got distorted because of aliasing, is this
right ?
And yet, in some places I've seen mentioned digital lowpass filters for
anti-aliasing. How is this possible ?
Thanks