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Which mechanism limits gate oxide thickness reduction in MOSFET transistors when targeting higher operating speeds?

A)Quantum tunneling of electrons
B)Increased parasitic gate capacitance
C)Thermal breakdown of gate material
D)Enhanced surface scattering of carriers

💡 Explanation

When gate oxide thickness decreases, quantum tunneling increases because electrons can tunnel directly through the insulating layer, leading to leakage current and power dissipation. Therefore, tunneling limits further scaling, rather than capacitance increase etc. which are separate design constraints.

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