The Research of Level-Transform Strategy for Switching Amplifier Based on 2 Bit Delta-Sigma Modulator
Chen Jian-bi · Dianzi xuebao · 2015
The Delta-Sigma modulator( DSM) can get a better performance by increasing the quantizer's levels. But the multi-level DSMoutput cannot drive the switching amplifier directly due to the structural restrict of switching amplifier. By using the equalarea theory,a level-transform strategy is proposed and analyzed in this paper. With an appropriate level-transform scheme,the transformed DSMoutput obtains a much better SNR performance compared to the origin 2-level output.