Continuous-Time ΣΔ modulators with VCO-Based voltage-to-phase and voltage-to-frequency quantizers

Mootaz Allam (1) , Hassan Aboushady (1) , Marie-Minerve Louërat (1)

1 CIAN - Circuits Intégrés Numériques et Analogiques

In this paper, two different VCO-Based quantizers architectures are implemented and compared as multi-bit quantizers of Continuous-Time (CT) Sigma-Delta (ΣΔ) modulator. The first one is the voltage-to-frequency while the second is the voltage-to-phase architecture. Two 4th order CT-ΣΔ modulators are designed with Voltage-to-frequency and voltage-to-phase quantizers respectively. Both modulators are designed and simulated in 0.13µm technology. The comparision shows that voltage-to-phase quantizer remarkably reduces the VCO non-linearity and increases the modulator's maximum SNR.

Domaines: Electronique

Mootaz Allam, Hassan Aboushady, Marie-Minerve Louërat. Continuous-Time ΣΔ modulators with VCO-Based voltage-to-phase and voltage-to-frequency quantizers. MWSCAS 2010 - Midwest Symposium on Circuits and Systems, Aug 2010, Seattle, United States. pp.676 - 679, ⟨10.1109/MWSCAS.2010.5548917⟩. ⟨hal-00626957⟩