New Proposed Second-Order ASDM Using OTAs | Science Publications

American Journal of Applied Sciences

Farouq M. Al Taweel¹ 

关键词: ASDM;    OTA;    general SDM;    adaptive step-size;   

DOI  :  10.3844/ajassp.2006.1726.1729

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

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.

【 授权许可】

Unknown