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A New Method to Determine Effective MOSFET Channel Length

An accurate and convenient method to determine an effective MOSFET channel length is proposed. This method is based on a computer aided evaluation of an intrinsic MOSFET channel resistance without using special test devices. N-channel silicon-gate MOSFETs were fabricated, and the channel length and its range of device to device scatter were evaluated . To define an effective channel, a simple model of the source-drain (S-D) diffusion layer is proposed. This model shows that the expected transition layer resistance between the S-D diffusion layer and the inverted channel layer agrees with the experimental results. The accuracy of this method is also discussed. It is found to be better than 0.1 µm.