Filtering Adjacent Channel Blockers using Signal-Transfer-Function of Continuous-Time Sigma-Delta Modulators

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

1 CIAN - Circuits Intégrés Numériques et Analogiques

In this paper, we show that the signal transfer function of continuous-time /spl Sigma//spl Delta/ modulators can be used to remove the baseband analog filters in radio receivers. General expressions for the signal transfer function of continuous-time /spl Sigma//spl Delta/ modulators are derived. Comparisons between the frequency response of feedforward and feedback architectures of discrete-time and continuous-time /spl Sigma//spl Delta/ modulators are established. Filtering of GSM adjacent channel blockers using a 5/sup th/ order continuous-time /spl Sigma//spl Delta/ is given as an example.

Domaines: Informatique [cs]

Nicolas Beilleau, Hassan Aboushady, Marie-Minerve Rosset-Louërat. Filtering Adjacent Channel Blockers using Signal-Transfer-Function of Continuous-Time Sigma-Delta Modulators. MWSCAS 2004 - 47th Midwest Symposium on Circuits and Systems, Jul 2004, Hiroshima, Japan. pp.329-332, ⟨10.1109/MWSCAS.2004.1353994⟩. ⟨hal-01496198⟩