Title :
CODEC for echo-canceling, full-rate ADSL modems
Author :
Hester, Richard K. ; Mukherjee, Subhashish ; Padgett, Darryl ; Richardson, Donald ; Bright, William ; Sarraj, Maher M. ; Nabicht, Joseph T. ; Agah, Michael D. ; Bellaouar, Abdelatif ; Chaudhry, Irfan ; Hellums, James R. ; Islam, Kazi ; Loloee, Arash ; Tsa
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
fDate :
12/1/1999 12:00:00 AM
Abstract :
A CODEC, fabricated in 3.3-V CMOS, provides the low-voltage transmitter and receiver interfaces between the modem digital signal processing engine and the high-voltage hybrid circuitry for either the central office or the remote terminal ends of the subscriber loop, configurable by metal mask option. Extensive use of digital interpolation filters in the transmitter, decimation filters in the receiver, and oversampled data converters minimize the complexity of analog filters. On-chip filtering and 14-bit data converters support echo-canceling modems without requiring external filters. With additional external filters, frequency-division duplexing is also supported. The die area is 67.5 mm2. The power dissipation in the central office and remote terminal are 600 and 760 mW, respectively
Keywords :
CMOS integrated circuits; codecs; data conversion; digital subscriber lines; echo suppression; low-power electronics; modems; 3.3 V; 600 mW; 760 mW; ADSL modem; CMOS chip; CODEC; analog circuit; asymmetrical digital subscriber loop; broadband communication; central office; decimation filter; digital interpolation filter; echo cancellation; external filter; frequency division duplexing; low-voltage interface; metal mask; oversampled data converter; receiver; remote terminal; transmitter; CMOS digital integrated circuits; CMOS process; Central office; Codecs; Digital filters; Digital signal processing; Echo cancellers; Engines; Modems; Transmitters;
Journal_Title :
Solid-State Circuits, IEEE Journal of
