IEEE-04268406 (pdf) Noise and Group Delay in Actvie Filters
- relevant conclusion: the output noise spectrum is exactly proportinoal to the group delay.
- Poschenrieder established a relationship between group delay and energy stored in a passive filter.
- Fettweis proved from this that the noise generation of an active filter which is based on a passive filter is appoximately proportional to the group delay. (!!!)
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