Apply KCL around loop: Gate (n+ poly) + − − − − − − − University of California, Berkeley.For this condition, the surface potential has to equal the negative of the p-type potential.The threshold voltage is defined as the gate-body voltage that causes the surface to change from p-type to n-type.At this point, the depletion region stops growing and the extra charge is provided by the inversion charge at surface + − + + + + + + + + + + University of California, Berkeley.The surface potential increases to a point where the electron density at the surface equals the background ion density.− − − − − − − − − Body (p-type substrate) − − − − − − − − Inversion Charge has a square-root dependence on applied bias + − + + + + + + + + + + University of California, Berkeley.Potential drop across the oxide and depletion region.Positive charge on gate terminates on negative charges in depletion region.− − − − − − − − − Body (p-type substrate) − − − − − − − − Depletion: VFB download first transistor for free

I-V Curve University of California, Berkeley.

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