Open AccessImproved unity‐STF sturdy MASH ΣΔ modulator for low‐power wideband applications
Author(s) -
Taghizadeh M.,
Sadughi S.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.1976
Subject(s) - oversampling , integrator , delta sigma modulation , electronic engineering , wideband , noise shaping , topology (electrical circuits) , modulation (music) , noise (video) , transfer function , power (physics) , computer science , voltage , engineering , electrical engineering , physics , cmos , quantum mechanics , artificial intelligence , acoustics , image (mathematics)
A novel sturdy multi‐stage noise‐shaping sigma–delta modulator that cancels the first‐stage quantisation error at the output of the modulator is presented. Since any stage of the modulator has unity signal transfer function, the modulator would be very robust to circuit non‐idealities such as finite op‐amp gain. Furthermore, the signal processing timing issue in the critical paths of the proposed topology has been relaxed due to shifting the delay of the last integrator to the feedback path of the modulator. Moreover, this topology can be implemented in the circuit level by a fewer active blocks. Therefore, it practically would be suitable for low‐voltage and low‐oversampling applications. Simulation results show the usefulness of the proposed modulator.