Abstract
A CMOS analog front-end circuit for an FDM-based ADSL system is presented. The circuit contains all analog functions including AGC amplifiers, continuous-time band pass filters, /spl Sigma//spl Delta/ AD/DA converters, and digital decimation and interpolation filters. On-chip automatic tuning of the bandpass filters provides more than 300% center frequency range with 1% frequency accuracy. The higher-order /spl Sigma//spl Delta/ AD/DA converters achieve 12-b data conversion at 1.54 Msamples/s with an oversampling ratio of only 32. The 0.7 /spl mu/m CMOS circuit measures 65 mm/sup 2/ and consumes 1.9 W from a single 5 V power supply.
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