Title of article :
A CMOS Low-Power Noise Shaping-Enhanced SMASH ΣΔ Modulator
Author/Authors :
Fakhraie ، Habibeh Department of Engineering - Islamic Azad University, Central Tehran Branch , Moosazadeh ، Tohid Department of Engineering - Islamic Azad University, Central Tehran Branch , Sabbaghy ، Reza Department of Electrical Engineering - Islamic Azad University, Central Tehran Branch , Hassanzadeh ، Alireza ECE Department - Shahid Beheshti University
Abstract :
A discrete-time (DT) high-resolution and low-power sturdy multi-stage noise-shaping (SMASH) sigma-delta (ΣΔ) modulator is introduced. It proposes major solution for high-resolution applications relying on M-bit digital input-feedforward (DFF) technique which eliminates a power-hungry analog adder before the stage’s quantizer, decreases number of comparators for quantizer implementation and reduces the swing of the integrator’s output and a 2nd-order noise-coupling (NC) technique realized by few extra analog paths and enhances the noise shaping of the modulator without adding active blocks. The effectiveness of the introduced modulator is supported by the behavioral simulation and extensive mathematical analyses. The proposed modulator along with conventional one is simulated in a 0.18μm CMOS technology. The results indicate an outstanding improvement in dynamic range (DR) and resolution with less complexity.
Keywords :
SMASH Sigma , Delta Modulators , Noise Shaping , Digital Feed Forward , Noise Transfer Function(Ntf) , resolution
Journal title :
Majlesi Journal of Electrical Engineering
Journal title :
Majlesi Journal of Electrical Engineering