This paper presents a MATLAB toolbox for the automated high-level sizing of ΣΔ Modulators (ΣΔMs) based on the combination of an accurate time-domain behavioural simulator and a statistical optimizer. The implementation on the well-known MATLAB/SIMULINK platform brings numerous advantages in terms of data manipulation, flexibility and simulation with other electronic subsystems. Moreover, this is the first tool dealing with the synthesis of ΣΔMs using both Discrete-Time (DT) and Continuous-Time (CT) circuit techniques.This work has been supported by the EU ESPRIT IST Project 2001-34283/TAMES-2 and the Spanish CICYT Project TIC2001-0929/ADAVERE.Peer reviewed