Title :
A single-chip 2B1Q U-interface transceiver
Author :
Colbeck, R. ; Gervais, R. ; Hunt, G. ; Ahdab, A. ; Kurowski, Christopher
Author_Institution :
Mitel Semicond., Kanata, Ont., Canada
Abstract :
A single-chip transceiver designed to meet the ANSI requirements for the U-interface in the integrated services digital network (ISDN) is described. The device utilizes echo cancellation and the 2B1Q line code to achieve high performance in the presence of near-end crosstalk (NEXT) and other impairments. The 2- mu m, single-metal, double-polysilicon, 5-V CMOS VLSI chip includes all necessary analog and digital signal processing blocks so that a network termination or line termination U-interface can be realized with the addition of a passive line termination circuit and a transformer. Operation over 4.7 km of 0.4-mm or 7.5 km of 0.5 mm cable with a bit error rate of 10/sup -7/ is possible. The performance of the second-order delta-sigma analog/digital converter in response to a 10-kHz sinusoid, assuming a noise bandwidth of 40 kHz (-3 dB), is demonstrated.<>
Keywords :
CMOS integrated circuits; ISDN; VLSI; analogue-digital conversion; echo suppression; standards; transceivers; 2 micron; 2B1Q U-interface transceiver; 40 kHz; 5 V; ANSI requirements; CMOS VLSI chip; bit error rate; digital signal processing; double-polysilicon; echo cancellation; integrated services digital network; line code; line termination; near-end crosstalk; network termination; passive line termination circuit; second-order delta-sigma analog/digital converter; single-metal; Bit error rate; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS process; Crosstalk; Digital signal processing chips; Echo cancellers; ISDN; Transceivers; Very large scale integration;
Conference_Titel :
Solid-State Circuits Conference, 1989. Digest of Technical Papers. 36th ISSCC., 1989 IEEE International
Conference_Location :
New York, NY, USA
DOI :
10.1109/ISSCC.1989.48285
