DocumentCode :
2729347
Title :
An integrated adaptive analog balancing hybrid for use in (A)DSL modems
Author :
Pecourt, F. ; Hauptmann, Joerg ; Tenen, A.
Author_Institution :
Siemens Semicond. Group, Villach, Austria
fYear :
1999
fDate :
17-17 Feb. 1999
Firstpage :
252
Lastpage :
253
Abstract :
For high speed data modems, such as those for ADSL/HDSL, full-duplex transmission at bit-rates in the range of 10 Mb/s on 2-wire copper lines requires sophisticated designs. Complex data pump algorithms, as well as high performance analog front ends are required. Transmitting data simultaneously in both directions (full duplex) over a two wire twisted pair means that modems have to handle strong echo signals (transmit signal that comes back via receive path), while the received signal is strongly attenuated by the line itself. For transmit data in frequency division mode, transmit and receive signals can be well separated by high-order analog filtering. For overlapping bandwidths, the strong echo has to be suppressed either by an analog hybrid or digitally which requires extremely high resolution A/D converter (>15 b). This paper describes an integrated analog hybrid, which reduces the resolution needed in the ADC by more than 2b.
Keywords :
BiCMOS analogue integrated circuits; digital subscriber lines; modems; twisted pair cables; 10 Mbit/s; ADSL modems; BiCMOS; adaptive analog balancing hybrid; data pump algorithms; echo signals; frequency division mode; full-duplex transmission; high speed data modems; high-order analog filtering; overlapping bandwidths; received signal; resolution; two wire twisted pair; Bit rate; Circuit simulation; DSL; Filters; Frequency measurement; Modems; Solid state circuits; Testing; Topology; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Circuits Conference, 1999. Digest of Technical Papers. ISSCC. 1999 IEEE International
Conference_Location :
San Francisco, CA
ISSN :
0193-6530
Print_ISBN :
0-7803-5126-6
Type :
conf
DOI :
10.1109/ISSCC.1999.759226
Filename :
759226
Link To Document :
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