SIRIUS
®
TECHNICAL REFERENCE MANUAL
Overall bandwidth
Example
Anti-aliasing filter (AAF)
Illustration below “ SIRIUS® Anti-Aliasing Filter ” shows an overview of the different filters and
sampling rates in the frequency domain:
● The sample rate of SIRIUS is set to 2 kS/s.
● The analog aliasing filter is automatically set to 5 kHz (since the sampling rate is 2 kS/s)
and guarantees free acquisition.
● The oversampling factor is automatically set to 256 (because the sampling rate is <50 kS/s)
so that the internal sampling frequency of the Sigma-Delta ADC is 512 kS/s.
● Finally the digital FIR filter of the ADC is set to 1 kHz (half of the sampling rate).
SIRIUS
®
V20-1 287 / 336
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