Linear Cofactor Difference Extrema of MOSFET's Drain–Current and Application to Parameter Extraction

The linear cofactor difference extrema due to the nonlinearity of the MOSFET drain–current and their application to extract MOSFET parameters are presented in this brief. The extrema of drain–current are obtained by applying the linear cofactor difference operator to the drain–current versus gate voltage curve in the linear region. These extrema are directly used to find the threshold voltage and the mobility of a MOSFET. This method has been tested using data from experimentally fabricated MOSFETs and by simulating results through the device simulator DESSIS-ISE. The results agree well with those obtained by the standard second-derivative approach, which demonstrates the validity of the method presented. The advantages and disadvantages of this method are also discussed.