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Effects of excess phase in multiple-feedback active filters

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3 Author(s)

The paper presents theoretical and experimental results showing that lagging "excess phase" of second-order active filter sections causes potentially large errors in the form of a characteristic skewing of the passband shape of multiple-feedback (MF) bandpass functions. It is shown that simple capacitive phase-lead methods eliminate the deviations. The situation is discussed in detail for the specific case of "follow-theleader-feedback" bandpass filters, but applies equally to other MF topologies. Experimental data are presented to demonstrate the effects of excess phase and to verity the correctness of the design process.

Published in:

Circuits and Systems, IEEE Transactions on  (Volume:27 ,  Issue: 10 )

Date of Publication:

Oct 1980

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