Using Finite Impulse Response Feedback DACs to design Sigma-Delta modulators based on LC filters

Nicolas Beilleau (1) , Hassan Aboushady (1) , Marie-Minerve Rosset-Louërat (1)

1 CIAN - Circuits Intégrés Numériques et Analogiques

This paper proposes a general method to design the noise-transfer-function of a continuous-time /spl Sigma//spl Delta/ 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 /spl Sigma//spl Delta/ modulator where the internal nodes of the loop filter are removed for a more efficient circuit implementation.

Domaines: Informatique [cs]

Nicolas Beilleau, Hassan Aboushady, Marie-Minerve Rosset-Louërat. Using Finite Impulse Response Feedback DACs to design Sigma-Delta modulators based on LC filters. MWSCAS 2005 - 48th Midwest Symposium on Circuits and Systems, Aug 2005, Cincinnati, Ohio, United States. pp.696-699, ⟨10.1109/MWSCAS.2005.1594196⟩. ⟨hal-01419669⟩