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Low‐noise and low‐sensitivity filters using current‐mode coupled biquads
Author(s) -
Jurisic Drazen,
Moschytz George S.
Publication year - 2019
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2695
Subject(s) - digital biquad filter , control theory (sociology) , sensitivity (control systems) , noise (video) , filter (signal processing) , dynamic range , mathematics , topology (electrical circuits) , electronic engineering , physics , low pass filter , engineering , computer science , electrical engineering , control (management) , artificial intelligence , image (mathematics)
Summary In this paper, it is shown that by adding coupling to biquad pairs to obtain a fourth‐order band‐pass filter, the output thermal noise is reduced. It is shown analytically that minimum output thermal noise is obtained when the biquads are identical and the negative‐feedback factor used for coupling is the same as for the minimum sensitivity to component tolerances and ambient changes. Furthermore, by optimizing the coupled biquads for maximum dynamic range, the output noise is further decreased.