A digital prediction compensation for DR improvement in CT DSM with
digital noise coupling
Abstract
This paper presents a prediction-based dynamic range (DR) compensation
technique in continuous-time (CT) delta -sigma modulator (DSM) with
digital-domain noise coupling (DNC) structure. A digital prediction
technique is proposed to address the issue of maximum stable amplitude
(MSA) loss caused by DNC. The proposed prediction method has been shown
to significantly extend the MSA of CT DSM with DNC. Moreover, through
the extension of MSA, the DR and SNDR is significantly improved. A CTDSM
with proposed compensation achieves a SNDR of 85.1dB at -1dBFS and a DR
of 89dB.