It is shown that the type of nonlinearity of the substrate current-voltage
characteristic beyond the sidegating threshold changes from super to sublin
earity as the sidegate-to-channel spacing increases. Based on this, it is c
oncluded that the sidegating mechanism is a function of the sidegate-to-cha
nnel spacing. This conclusion is confirmed using a simple one-dimensional c
omputational model. (C) 2000 Published by Elsevier Science Ltd. All rights
reserved.