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Using finite impulse response feedback DACs to design ΣΔ modulators based on LC filters

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3 Author(s)
N. Beilleau ; Paris Univ., France ; H. Aboushady ; M. M. Louerat

This paper proposes a general method to design the noise-transfer-function of a continuous-time ΣΔ modulator having high-order passive LC loop filters. The feedback signals can have arbitrary shapes and can be applied either at internal nodes or only at the input node. As a design example, this technique is used to design a 4th order ΣΔ modulator where the internal nodes of the loop filter are removed for a more efficient circuit implementation.

Published in:

48th Midwest Symposium on Circuits and Systems, 2005.

Date of Conference:

7-10 Aug. 2005