El pdf del artículo es la versión post-print.This paper presents a ΣΔ modulator (ΣΔM) which combines single-bit and multi-bit quantization in a cascade architecture to obtain high resolution with low oversampling ratio. It is less sensitive to the non-linearity of the DAC than those previously reported, thus enabling the use of very simple analog circuitry with neither calibration nor trimming required.This work has been supported by Spanish C.I.C.Y.T. under contract TIC97-0580.Peer reviewed