Editing MOSFET (section)

===Lower output resistance===
For analog operation, good gain requires a high MOSFET output impedance, which is to say, the MOSFET current should vary only slightly with the applied drain-to-source voltage. As devices are made smaller, the influence of the drain competes more successfully with that of the gate due to the growing proximity of these two electrodes, increasing the sensitivity of the MOSFET current to the drain voltage. To counteract the resulting decrease in output resistance, circuits are made more complex, either by requiring more devices, for example the [[cascode]] and [[cascade amplifier]]s, or by feedback circuitry using [[operational amplifiers]], for example a circuit like that in the adjacent figure.