Using excess loop delay to simplify LC-based ΣΔ modulators

Ahmed Ashry (1) , Hassan Aboushady (1)

1 CIAN - Circuits Intégrés Numériques et Analogiques

The excess loop delay in continuous-time LC-based ΣΔ modulators, which usually has negative effect on the stability and the signal-to-noise ratio of the modulator, can be used to simplify the modulator architecture and reduce the number of needed feedback branches. The proposed technique is discussed and validated using a design example of a fourth-order bandpass continuous-time LC-based modulator.

Domaines: Electronique

Ahmed Ashry, Hassan Aboushady. Using excess loop delay to simplify LC-based ΣΔ modulators. Electronics Letters, 2009, 45 (25), pp.1298-1299. ⟨10.1049/el.2009.2650⟩. ⟨hal-00574538⟩