Title :
A CMOS modem analog processor for V.22 bis modems
Author :
Daubert, Steven J. ; Green, David W. ; Khoury, John M. ; Trosino, James M. ; Zimany, Edward J. ; Barner, Jeffrey R. ; Plany, Joseph ; Tompsett, Michael F.
Author_Institution :
AT&T Bell Lab., Murray Hill, NJ, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
A mixed analog/digital chip that forms the core of a medium-speed modem for use on the public switched telephone network is described. It meets CCITT and AT&T requirements for data transmission at 2400 and 1200 b/s, and the AT&T requirement for 300-b/s operation. The chip is implemented in a 1.75- mu m analog CMOS process and occupies 32.4 mm/sup 2/. The device is powered by a single +5-V supply and consumes less than 115 mW. The architecture and circuit implementation are described, and experimental results are given.<>
Keywords :
CMOS integrated circuits; modems; 1.75 micron; 115 mW; 1200 bit/s; 2400 bit/s; 300 bit/s; 5 V; AT&T requirements; CCITT requirements; CMOS modem analog processor; V.22 bis modems; analog CMOS process; circuit implementation; data transmission; experimental results; mixed analog/digital chip; public switched telephone network; single supply; CMOS process; Circuits; Costs; Demodulation; Digital filters; Frequency shift keying; Microcontrollers; Modems; Phase modulation; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
