DIBL occurs due to the reduction of the potential barrier in the channel when a high drain voltage is applied. This reduction can be understood through two primary mechanisms: 1. Electrostatic Coupling: The drain voltage influences the channel potential directly through the depletion region, lowering the barrier height. 2. Channel Pinch-off: At high drain voltages, the depletion region near the drain spreads into the channel, effectively shortening it and reducing the potential barrier.
