Comparative rating of logic active devices
L.J. Giacoletto · IEEE Transactions on Electron Devices · 1989
The change in a logic figure of merit as the ultimate speed of logic active devices is tracked over a period of years. Current high-speed FET devices have ultimate speeds corresponding to an equivalent wire length of 3.4 mm, which is comparable to the distance between input and output terminals. Consequently, further significant increases in logic speed for active devices cannot be expected.>