I would like to know,why the larger the OSR, the smaller the BANGWIDTH will be.
BANGWIDTH refers to the frequency of the input signal?
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The oversampling ratio determines how many samples are used in the filter to generate a single output sample. This determines the output rate, and thus the bandwidth of the filter, which will also determine the bandwidth of the input that will be reproducible at the output. Please see the Delta Sigma Modulator Filter Calculator for a simple way to visualize these interactions.