A CMOS oversampling D/A converter with multi-bit semi-digital filtering and boosted subcarrier SNR for ADSL central office modems

摘要

An oversampling D/A converter for use in ADSL central office modems has been integrated in 0.18-/spl mu/m CMOS technology. The converter features a resampled, multibit semidigital filter for reconstruction and a digital pre-emphasis filter that flattens