An analog front end for combined high speed data and facsimile group 3 modems

Author

Halim, Raouf ; Shamlou, Danny

Author_Institution

Hayes Microcomputer Products Inc., Norcross, GA, USA

fYear

1991

fDate

14-17 May 1991

Firstpage

245

Abstract

A single-chip analog front end (AFE) for combined 9600-b/s ping-pong and facsimile group 3 dial-up modems (up to 14400 b/s) has been implemented. The AFE supports V.17/V.29/V.27 ter transmission modes for facsimile and V.32 9600/4800-b/s ping-pong for data, as well as lower speed modem full-duplex fallback modes from V.22 bis 2400 b/s down to 300 b/s. It meets all domestic and international requirements while maintaining better than 30-dB worst-case signal-to-noise ratio across the full received signal dynamic range of 48 dB. This mixed switched-capacitor/digital IC integrates 97 stages of analog signal filtering/processing with A/D and D/A converters and 1700 gates of DSP and microprocessor bus interface logic. It occupies 74000 mil² in a standard 3-μm double-poly CMOS process

Keywords

CMOS integrated circuits; mixed analogue-digital integrated circuits; modems; switched capacitor networks; 3 micron; 30 dB; 300 to 14400 bit/s; A/D convertor; ADC; D/A converters; DAC; DSP; SNR; V.17; V.22 bis; V.27; V.29; V.32; analog signal filtering; analog signal processing; dial-up modems; digital IC; double-poly CMOS process; facsimile group 3 modems; full-duplex fallback modes; high speed data; microprocessor bus interface logic; ping-pong; single-chip analog front end; switched-capacitor; transmission modes; Analog integrated circuits; Analog-digital conversion; Digital filters; Digital integrated circuits; Dynamic range; Facsimile; Filtering; Modems; Signal processing; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991., Proceedings of the 34th Midwest Symposium on

Conference_Location

Monterey, CA

Print_ISBN

0-7803-0620-1

Type

conf

DOI

10.1109/MWSCAS.1991.252053

Filename

252053