American Journal of Applied Sciences

New Proposed Second-Order ASDM Using OTAs

Farouq M. Al Taweel

DOI : 10.3844/ajassp.2006.1726.1729

American Journal of Applied Sciences

Volume 3, Issue 2

Pages 1726-1729


In this work, we present a new proposal for the second-order Adaptive Sigma Delta Modulation (ASDM). The new proposed Adaptation scheme is based on using Operational Transconductance Amplifier (OTAs) as an Integrator and as an Amplifier to adapt the quantizer step-size to control the voltage gain by feedback the quantizer output through adaptation scheme. The step-size is changing up or down by the output voltage of the integrator for every clock period. A comparison with general second-order SDM proves that our idea about using OTAs to achieve a high resolution and confirm the signal-to-noise ratio is better than GSM.


© 2006 Farouq M. Al Taweel. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.