Title :
An adaptive CMOS transmission line driver
Author :
Patel, Hitesh N. ; Hohl, Jakob H. ; Oalusinski, O.A.
Author_Institution :
ACTEL Corp., Sunnyvale, CA, USA
Abstract :
Fabrication process tolerances prevent the direct and precise matching of off-chip driver impedances to the impedances of driven transmission lines. The adaptive circuit described automatically adjusts the output impedance of a reference driver to that of a reference transmission line and generates a control voltage for adjusting the output impedances of the other drivers on the same chip to the same impedance. Simulation shows a ten-to-one reduction in the impedance mismatch
Keywords :
CMOS integrated circuits; application specific integrated circuits; buffer circuits; driver circuits; impedance matching; ASIC; adaptive CMOS transmission line driver; cascaded invertors; control voltage; impedance mismatch; output impedance; reference driver; reference transmission line; simulation; Adaptive control; Automatic generation control; Automatic voltage control; Circuit simulation; Distributed parameter circuits; Driver circuits; Fabrication; Impedance; Programmable control; Transmission lines;
Conference_Titel :
ASIC Conference and Exhibit, 1993. Proceedings., Sixth Annual IEEE International
Conference_Location :
Rochester, NY
Print_ISBN :
0-7803-1375-5
DOI :
10.1109/ASIC.1993.410759
