Causes of drain current local variability are analyzed by decomposing into current variability components. Besides V TH and G m components, it is newly found that effects of "current onset" variability caused by channel potential fluctuations largely contribute to the current variability and that G m component is relatively small in the saturation region. It is shown that both V TH and current onset components decreases with reducing channel dopants, indicating that intrinsic channel is very effective to reduce current variability. (Keywords: Current variability, V TH , current onset, and G m ) 978-1-4244-7641-1/10/$26.00 ©2010 IEEE

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Ni–Zn ferrite films were prepared by spin-spray ferrite plating method at 90 °C on glass substrates from a reaction solution of FeCl2(+FeCl3)+NiCl2+ZnCl2 and an oxidizing solution of NaNO2+CH3COONH4. The complex permeability μ=μ′−iμ″ values of the as-plated films were measured at frequencies up to 3 GHz. The Ni0.28Zn0.18Fe2.54O4 film 0.40 μm in thickness plated using the mixture of Fe2+ and Fe3+ as iron ions exhibited a high μ′ of around 42 and a resonance frequency fr of 1.2 GHz. This fr value is about nine times as high as the 130 MHz that was estimated from Snoek’s limit for the Ni–Zn ferrite bulk ceramics. Since μ′ also exhibited a maximum value of about 35, the films prepared in this study will be applicable to both rf inductors and wave absorbers for electromagnetic interference suppression.