A 25 kft 768 kb/s CMOS transceiver for multiple bit-rate DSL

An all 0.5 /spl mu/m CMOS transceiver IC is capable of supporting 768 kb/s rates on a single copper loop. Trade-offs between data rate and loop length are afforded by support of multiple bit rates. The same transmitter concept is also integrated for asymmetric digital subscriber line (ADSL), and tested for downstream rates of 6000-8000 kb/s.