Measurement of MOSFET constants

Abstract

A method is described to electrically determine MOSFET channel length, mobility, gate-bias dependence and parasitic series resistance. These four quantities are obtained by curve fitting output resistance measurements over a range of gate biases and channel lengths. Measurements from two gate biases on each of two devices of different channel lengths are sufficient to obtain a full characterization. Thus, the method is well suited for automated testing because of its simplicity and efficiency.