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On the synthesis of cascaded continuous-time ΣΔ modulators

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3 Author(s)
Ortmanns, M. ; Inst. of Microelectron., Saarlandes Univ., Saarbrucken, Germany ; Gerfers, F. ; Manoli, Y.

This paper introduces a new method for synthesis of high-order cascaded continuous time ΣΔ-modulators. A simple discrete time to continuous time (DT/CT) equivalence applied previously only to single loop modulators is extended and employed in cascaded CT ΣΔ-modulators. The method converts the DT loop-filter to a CT counterpart working with the same digital cancellation logic. Here the synthesis of a 3rd order continuous time SOFO modulator is presented. Some nonidealities are analyzed, both analytically and by simulation

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Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on  (Volume:5 )

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