A general method of determining the parameters for a well-known noise model of a second-generation current conveyor (CCII) is presented. The method is used to determine the thermal noise model parameters for two different CMOS CCII implementations. The simulation is carried out with the parameters of the AMS 0.35 μm technology using PSpice. For one of the analyzed implementations, the thermal noise model parameters are also derived analytically. They are shown to be in good agreement with the ones obtained by simulation.