This paper presents an experimental study of mismatching on the analog characteristics of fully-depleted graded-channel SOI MOSFET in comparison to uniformly doped transistors. The study is carried out using dedicated structures to account for the mismatch that have been fabricated at the same chip and with the same technology. Important basic parameters such as threshold voltage and subthreshold slope were analyzed as well as analog parameters, namely transconductance, output conductance, Early voltage and intrinsic voltage gain.