There is always some formulas for calculating "Au" or "Gu". But there are never given any equations that reffer to current gain in MOSFETs. I know current gain is almost infinite in normal CS amplifier, but can that value be shown as an equation?
And what happens when "Rs" is applied to the circuit? Since voltage gain is explained I know that "Rs" decreases voltage gain. But what happens with current gain in Common Source with source degeneration circuit? Is it also decreased? Can be that value calculated through equation that defines current gain ("Ai" & "Gi")?