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Independent common-mode and differential-mode design of fully differential analog filters

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3 Author(s)

Fully differential filter design is usually made departing from a single-ended prototype. This procedure guarantees the desired differential-mode response, but does not take into account common-mode dynamics, which could present nonacceptable transient responses or stability problems. A state-space design technique, which provides control of both differential and common-mode responses, is proposed. It is based on a feedback topology that allows independent assignment of differential and common-mode eigenvalues. This technique ensures circuit stability and also provides a high common-mode rejection ratio, which is independent of component unbalances. Experimental results on a first-order state-space filter are presented.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:53 ,  Issue: 7 )