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ADS1262: Fundamentals of Precision ADC Noise Analysis

Part Number: ADS1262

Hi TI Team,

   When I was going through "Fundamentals of Precision ADC Noise Analysis"(slyy 192).I couldn't understand how you calculated ENBW of Antialiasiing filter and Sinc4 filter(Chapter 2.2).

ENBW of Antialiasing Filter is 2.5khz,

ENBW of Sinc4 Filter is Infinity

and when we combine both 

ENBW is 14Hz.

As given in the document Pg26.

"Now that both filters are magnitude plots (in decibels [dB])with the same x-axis scale, you can simply add them together to determine the overall system ENBW."

Can anyone explain this.

Regards,

Venkatavel.