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Voltage Operating Point Adjustment

The FO4 delay is the delay of one inverter when driving four others over the minimal amount of wiring.

CMOS logic delay is inversely proportional to supply voltage. For instance:

Delay is approximately proportional to ( C * V ) / ( (V-Vt) ^ 2) This says its a table but it is a plot.
20: (C) 2008-17, DJ Greaves, University of Cambridge, Computer Laboratory.