A CMOS analog front-end circuit for an FDM-based ADSL system

Author

Chang, Zhong-Yuan ; Macq, Damien ; Haspeslagh, D. ; Spruyt, Paul M P ; Goffart, Bernard L A G

Author_Institution

Alcatel Bell Telephone, Antwerp, Belgium

Volume

30

Issue

12

fYear

1995

fDate

12/1/1995 12:00:00 AM

Firstpage

1449

Lastpage

1456

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, ΣΔ 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 ΣΔ AD/DA converters achieve 12-b data conversion at 1.54 Msamples/s with an oversampling ratio of only 32. The 0.7 μm CMOS circuit measures 65 mm² and consumes 1.9 W from a single 5 V power supply

Keywords

CMOS analogue integrated circuits; analogue-digital conversion; automatic gain control; band-pass filters; continuous time filters; digital-analogue conversion; frequency division multiplexing; interpolation; subscriber loops; ΣΔ AD/DA converters; 0.7 micron; 1.9 W; 12 bit; 5 V; AGC amplifiers; CMOS analog front-end circuit; FDM-based ADSL system; asymmetrical digital subscriber loop; automatic tuning; bandpass filters; continuous-time band pass filters; data conversion; digital decimation filters; interpolation filters; oversampling ratio; Analog-digital conversion; Band pass filters; CMOS analog integrated circuits; Circuit optimization; Data conversion; Digital filters; Frequency; Interpolation; Power measurement; Tuning;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.482192

Filename

482192