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Noise model of gate-leakage current in ultrathin oxide MOSFETs

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4 Author(s)
Lee, J. ; Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA ; Bosman, Gijs ; Green, K.R. ; Ladwig, D.

A physics-based analytical model of the gate-leakage current noise in ultrathin gate oxide MOSFETs is presented. The noise model is based on an inelastic trap-assisted tunneling transport. We employ the barrier height fluctuation model and the Lorentzian-modulated shot noise of the gate-leakage current stemming from the two-dimensional electron gas channel to explain the excess noise behavior. The excess noise can be interpreted as the sum of 1/fγ noise and the Lorentzian-modulated shot noise. Trap-related processes are the most likely cause of excess current noise because slow traps in the oxide can result in low-frequency dissipation in the conductance of oxides and fast traps can produce the Lorentzian-modulated shot noise associated with generation-recombination process at higher frequencies. In order to verify the proposed noise model, the simulation results are compared with experimental data, and excellent agreement is observed.

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Electron Devices, IEEE Transactions on  (Volume:50 ,  Issue: 12 )