Title :
A 5-V front-end chip for a universal voice-band modem
Author :
Yeung, Michavel K. ; Cheung, Paul S. ; Arulanantham, R.
Author_Institution :
Phylon Commun., Fremont, CA, USA
fDate :
12/1/1990 12:00:00 AM
Abstract :
A circuit that, combined with one or two commercially available digital signal processing (DSP) chips, may implement all voice-band modem standards from 300 b/s to 14.4 kb/s, in full or half duplex operation including echo-cancelling standards, is presented. All analog functions and all non-DSP digital functions are performed by the circuit. Good dynamic range with low distortion in the analog circuitry is maintained while designing for a high-density digital process with high-quality capacitors. Such a process can be used to achieve an area-efficient circuit. The circuit has been implemented in a 1.2-μm CMOS double-poly, double-metal process, operates off a single 5-V supply, and measures only 63 kmil2 (40.7 mm2)
Keywords :
CMOS integrated circuits; echo suppression; modems; voice communication; 1.2 micron; 300 to 14400 bit/s; CMOS; area-efficient circuit; digital signal processing; double-metal process; dynamic range; echo-cancelling standards; front-end chip; full duplex; half duplex operation; high-density digital process; universal voice-band modem; Capacitors; Circuits; Digital signal processing chips; Distortion measurement; Dynamic range; Echo cancellers; Modems; Power supplies; Standards development; Synchronous generators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
