At high frequencies the gate admittance of the MOSFET contains a condu
ctive component because of the capacitive coupling of the gate electro
de to the channel. The thermal noise fluctuations, originating in the
channel, induce a gale current outwards from the gate electrode. Based
on a proved two-region model for the drain current noise of a sub-mic
ron MOSFET, it is shown that the calculated gate-noise current increas
es significantly, compared to that predicted by a classical model, val
id for long channel devices. (C) 1997 Elsevier Science Ltd.