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

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 the overall in-band magnitude response and boo...

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Bibliographic Details
Main Authors: Lin, A.C.Y., Su, D.K., Hester, R.K., Wooley, B.A.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Central office
CMOS technology
Digital filters
Dynamic range
Filtering
Modems
Noise shaping
Sampling methods
Signal to noise ratio
Online Access:Request full text
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Description
Summary: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 the overall in-band magnitude response and boosts the SNR of subcarriers affected by noise shaping. When sampling at 200 MHz, the converter achieves 86 dB of dynamic range for a 1.1-MHz bandwidth, with an average MTPR of 73dBc.
ISSN:2158-5601
2158-5636
DOI:10.1109/VLSIC.2005.1469349